42. Berge, D.; Funk, S.; Hinton, J. Background modelling in very-high-energy γ-ray astronomy. *Astron. Astrophys.* **2007**, *466*, 1219–1229.
[CrossRef]

43. Jardin-Blicq, A.; Marandon, V.; Brun, F. A complementary view of the galactic plane in TeV gamma rays by HAWC and H.E.S.S. In Proceedings of the 36th International Cosmic Ray Conference (ICRC2019), Madison, WI, USA, 24 July–1 August 2019; Volume 36, p. 706.

44. Vovk, I.; Strzys, M.; Fruck, C. Spatial likelihood analysis for MAGIC telescope data. From instrument response modelling to spectral extraction. *Astron. Astrophys.* **2018**, *619*, A7. [CrossRef]

45. Knödlseder, J.; Tibaldo, L.; Tiziani, D.; Specovius, A.; Cardenzana, J.; Mayer, M.; Kelley-Hoskins, N.; Di Venere, L.; Bonnefoy, S.; Ziegler, A.; et al. Analysis of the H.E.S.S. public data release with ctools. *Astron. Astrophys.* **2019**, *632*, A102. [CrossRef]

46. Mohrmann, L.; Specovius, A.; Tiziani, D.; Funk, S.; Malyshev, D.; Nakashima, K.; van Eldik, C. Validation of open-source science tools and background model construction in γ-ray astronomy. *Astron. Astrophys.* **2019**, *632*, A72. [CrossRef]

47. Holler, M.; Lenain, J.P.; de Naurois, M.; Rauth, R.; Sanchez, D.A. A run-wise simulation and analysis framework for Imaging Atmospheric Cherenkov Telescope arrays. *Astropart. Phys.* **2020**, *123*, 102491. [CrossRef]

48. Atkins, R.; Benbow, W.; Berley, D.; Blaufuss, E.; Bussons, J.; Coyne, D.G.; Delay, R.S.; DeYoung, T.; Dingus, B.L.; Dorfan, D.E.; et al. Observation of TeV Gamma Rays from the Crab Nebula with Milagro Using a New Background Rejection Technique. *Astrophys. J.* **2003**, *595*, 803–811. [CrossRef]

49. Aguilar, M.; et al. [AMS Collaboration] Precision Measurement of the Proton Flux in Primary Cosmic Rays from Rigidity 1 GV to 1.8 TV with the Alpha Magnetic Spectrometer on the International Space Station. *Phys. Rev. Lett.* **2015**, *114*, 171103. [CrossRef]

50. Aguilar, M.; et al. [AMS Collaboration] Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station. *Phys. Rev. Lett.* **2015**, *115*, 211101. [CrossRef]

51. Aguilar, M.; et al. [AMS Collaboration] Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer. *Phys. Rev. Lett.* **2021**, *126*, 041104. [CrossRef] [PubMed]

52. Aguilar, M.; et al. [AMS Collaboration] Properties of Heavy Secondary Fluorine Cosmic Rays: Results from the Alpha Magnetic Spectrometer. *Phys. Rev. Lett.* **2021**, *126*, 081102. [CrossRef]

53. Aguilar, M.; et al. [AMS Collaboration] Properties of Neon, Magnesium, and Silicon Primary Cosmic Rays Results from the Alpha Magnetic Spectrometer. *Phys. Rev. Lett.* **2020**, *124*, 211102. [CrossRef]

54. Aguilar, M.; et al. [AMS Collaboration] Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station. *Phys. Rev. Lett.* **2014**, *113*, 121102. [CrossRef]

55. Aguilar, M.; et al. [AMS Collaboration] Observation of New Properties of Secondary Cosmic Rays Lithium, Beryllium, and Boron by the Alpha Magnetic Spectrometer on the International Space Station. *Phys. Rev. Lett.* **2018**, *120*, 021101. [CrossRef]

56. Murphy, R.P.; Sasaki, M.; Binns, W.R.; Brandt, T.J.; Hams, T.; Israel, M.H.; Labrador, A.W.; Link, J.T.; Mewaldt, R.A.; Mitchell, J.W.; et al. Galactic Cosmic Ray Origins and OB Associations: Evidence from SuperTIGER Observations of Elements $_{26}$Fe through $_{40}$Zr. *Astrophys. J.* **2016**, *831*, 148. [CrossRef]

57. Cummings, A.C.; Stone, E.C.; Heikkila, B.C.; Lal, N.; Webber, W.R.; Jóhannesson, G.; Moskalenko, I.V.; Orlando, E.; Porter, T.A. Galactic Cosmic Rays in the Local Interstellar Medium: Voyager 1 Observations and Model Results. *Astrophys. J.* **2016**, *831*, 18. [CrossRef]

58. An, Q.; et al. [DAMPE collaboration] Measurement of the cosmic-ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite. *Sci. Adv.* **2019**, *5*, eaax3793. [CrossRef]

59. Panov, A.D.; Adams, J.H., Jr.; Ahn, H.S.; Bashinzhagyan, G.L.; Watts, J.W.; Wefel, J.P.; Wu, J.; Ganel, O.; Guzik, T.G.; Zatsepin, V.I.; et al. Energy Spectra of Abundant Nuclei of Primary Cosmic Rays from the Data of ATIC-2 Experiment: Final Results. *Bull. Russ. Acad. Sci. Phys.* **2009**, *73*, 564–567. [CrossRef]

60. Atkin, E.; Bulatov, V.; Dorokhov, V.; Gorbunov, N.; Filippov, S.; Grebenyuk, V.; Karmanov, D.; Kovalev, I.; Kudryashov, I.; Kurganov, A.; et al. New Universal Cosmic-Ray Knee near a Magnetic Rigidity of 10 TV with the NUCLEON Space Observatory. *JETP Lett.* **2018**, *108*, 5–12. [CrossRef]

61. Aharonian, F.; et al. [H.E.S.S. Collaboration] Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S. *Astron. Astrophys.* **2009**, *508*, 561. [CrossRef]

62. Kerszberg, D. The cosmic-ray electron spectrum measured with H.E.S.S. In Proceedings of the International Cosmic Ray Conference (CRI215), Busan, Korea, 10–20 July 2017.

63. Adriani, O.; Akaike, Y.; Asano, K.; Asaoka, Y.; Bagliesi, M.G.; Berti, E.; Bigongiari, G.; Binns, W.R.; Bonechi, S.; Bongi, M.; et al. Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station. *Phys. Rev. Lett.* **2018**, *120*, 261102. [CrossRef] [PubMed]

64. Ambrosi, G.; et al. [DAMPE Collaboration] Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons. *Nature* **2017**, *552*, 63–66. [CrossRef]

65. Ben Bekhti, N.; et al. [HI4PI Collaboration] HI4PI: A full-sky H I survey based on EBHIS and GASS. *Astron. Astrophys.* **2016**, *594*, A116. [CrossRef]

66. Peek, J.E.G.; Babler, B.L.; Zheng, Y.; Clark, S.E.; Douglas, K.A.; Korpela, E.J.; Putman, M.E.; Stanimirović, S.; Gibson, S.J.; Heiles, C. The GALFA-H I Survey Data Release 2. *Astrophys. J. Suppl. Ser.* **2018**, *234*, 2. [CrossRef]

67. Dame, T.M.; Hartmann, D.; Thaddeus, P. The Milky Way in Molecular Clouds: A New Complete CO Survey. *Astrophys. J.* **2001**, *547*, 792–813. [CrossRef]
68. Furukawa, N.; Ohama, A.; Fukuda, T.; Torii, K.; Hayakawa, T.; Sano, H.; Okuda, T.; Yamamoto, H.; Moribe, N.; Mizuno, A.; et al. The Jet and Arc Molecular Clouds toward Westerlund 2, RCW 49, and HESS J1023-575 $^{12}$CO and $^{13}$CO (J = 2–1 and J = 1–0) observations with NANTEN2 and Mopra Telescope. *Astrophys. J.* **2014**, *781*, 70. [CrossRef]

69. Braiding, C.; Wong, G.F.; Maxted, N.I.; Romano, D.; Burton, M.G.; Blackwell, R.; Filipović, M.D.; Freeman, M.S.R.; Indermuehle, B.; Lau, J.; et al. The Mopra Southern Galactic Plane CO Survey—Data Release 3. *Publ. Astron. Soc. Aust.* **2018**, *35*, e029. [CrossRef]

70. Bolatto, A.D.; Wolfire, M.; Leroy, A.K. The CO-to-H₂ Conversion Factor. *Annu. Rev. Astron. Astrophys.* **2013**, *51*, 207–268. [CrossRef]

71. Sodroski, T.J.; Odegard, N.; Arendt, R.G.; Dwek, E.; Weiland, J.L.; Hauser, M.G.; Kelsall, T. A Three-dimensional Decomposition of the Infrared Emission from Dust in the Milky Way. *Astrophys. J.* **1997**, *480*, 173–187. [CrossRef]

72. Cordes, J.M.; Lazio, T.J.W. NE2001. II. Using Radio Propagation Data to Construct a Model for the Galactic Distribution of Free Electrons. *arXiv* **2003**, arXiv:astro-ph/0301598.

73. Alves, M.I.R.; Calabretta, M.; Davies, R.D.; Dickinson, C.; Staveley-Smith, L.; Davis, R.J.; Chen, T.; Barr, A. The HIPASS survey of the Galactic plane in radio recombination lines. *Mon. Not. R. Astron. Soc.* **2015**, *450*, 2025–2042. [CrossRef]

74. Akrami, Y.; et al. [Planck Collaboration] Planck 2018 results. IV. Diffuse component separation. *Astron. Astrophys.* **2020**, *641*, A4. [CrossRef]

75. Green, G.M.; Schlafly, E.; Zucker, C.; Speagle, J.S.; Finkbeiner, D. A 3D Dust Map Based on Gaia, Pan-STARRS 1, and 2MASS. *Astrophys. J.* **2019**, *887*, 93. [CrossRef]

76. Lallement, R.; Babusiaux, C.; Vergely, J.L.; Katz, D.; Arenou, F.; Valette, B.; Hottier, C.; Capitanio, L. Gaia-2MASS 3D maps of Galactic interstellar dust within 3 kpc. *Astron. Astrophys.* **2019**, *625*, A135. [CrossRef]

77. Remy, Q.; Grenier, I.A.; Marshall, D.J.; Casandjian, J.M. Cosmic-rays, gas, and dust in nearby anti-centre clouds. III. Dust extinction, emission, and grain properties. *Astron. Astrophys.* **2018**, *616*, A71. [CrossRef]

78. Balashev, S.A.; Noterdaeme, P.; Rahmani, H.; Klimenko, V.V.; Ledoux, C.; Petitjean, P.; Srianand, R.; Ivanchik, A.V.; Varshalovich, D.A. CO-dark molecular gas at high redshift: Very large H₂ content and high pressure in a low-metallicity damped Lyman alpha system. *Mon. Not. R. Astron. Soc.* **2017**, *470*, 2890–2910. [CrossRef]

79. Engelke, P.D.; Allen, R.J. OH as an Alternate Tracer for Molecular Gas: Quantity and Structure of Molecular Gas in W5. *Astrophys. J.* **2019**, *874*, 49. [CrossRef]

80. Engelke, P.D.; Allen, R.J.; Busch, M.P. Star-forming versus Quiescent Regions in the Galaxy: A Case Study of ISM Properties Based on 18 cm OH and $^{12}$CO (1-0) Observations. *Astrophys. J.* **2020**, *901*, 50. [CrossRef]

81. Smith, R.J.; Glover, S.C.O.; Clark, P.C.; Klessen, R.S.; Springel, V. CO-dark gas and molecular filaments in Milky Way-type galaxies. *Mon. Not. R. Astron. Soc.* **2014**, *441*, 1628–1645. [CrossRef]

82. Vernetto, S.; Lipari, P. Absorption of very high energy gamma rays in the Milky Way. *Phys. Rev. D* **2016**, *94*, 063009. [CrossRef]

83. Popescu, C.C.; Yang, R.; Tuffs, R.J.; Natale, G.; Rushton, M.; Aharonian, F. A radiation transfer model for the Milky Way: I. Radiation fields and application to high-energy astrophysics? *Mon. Not. R. Astron. Soc.* **2017**, *470*, 2539–2558. [CrossRef]

84. Porter, T.A.; Jóhannesson, G.; Moskalenko, I.V. High-energy Gamma Rays from the Milky Way: Three-dimensional Spatial Models for the Cosmic-Ray and Radiation Field Densities in the Interstellar Medium. *Astrophys. J.* **2017**, *846*, 67. [CrossRef]

85. Popescu, C.C.; Tuffs, R.J.; Dopita, M.A.; Fischera, J.; Kylafis, N.D.; Madore, B.F. Modelling the spectral energy distribution of galaxies. V. The dust and PAH emission SEDs of disk galaxies. *Astron. Astrophys.* **2011**, *527*, A109. [CrossRef]

86. Paradis, D.; Reach, W.T.; Bernard, J.-P.; Madden, S.; Dobashi, K.; Meixner, M.; Onishi, T.; Kawamura, A.; Fukui, Y. A Statistical Study of Dust Properties in Large Magellanic Cloud Molecular Clouds. *Astron. J.* **2011**, *141*, 43. [CrossRef]

87. Niederwanger, F.; Reimer, O.; Kissmann, R.; Strong, A.W.; Popescu, C.C.; Tuffs, R. The consequence of a new ISRF model of the Milky Way on predictions for diffuse gamma-ray emission. *Astropart. Phys.* **2019**, *107*, 1–14. [CrossRef]

88. Beck, R. Magnetic fields in spiral galaxies. *Astron. Astrophys. Rev.* **2015**, *24*, 4. [CrossRef]

89. Sun, X.-H.; Reich, W. The Galactic halo magnetic field revisited. *Res. Astron. Astrophys.* **2010**, *10*, 1287–1297. [CrossRef]

90. Fauvet, L.; Macías-Pérez, J.F.; Jaffe, T.R.; Banday, A.J.; Désert, F.X.; Santos, D. Expected constraints on the Galactic magnetic field using Planck data. *Astron. Astrophys.* **2012**, *540*, A122. [CrossRef]

91. Jansson, R.; Farrar, G.R. A New Model of the Galactic Magnetic Field. *Astrophys. J.* **2012**, *757*, 14. [CrossRef]

92. Jaffe, T.R.; Ferrière, K.M.; Banday, A.J.; Strong, A.W.; Orlando, E.; Macías-Pérez, J.F.; Fauvet, L.; Combet, C.; Falgarone, E. Comparing polarized synchrotron and thermal dust emission in the Galactic plane. *Mon. Not. R. Astron. Soc.* **2013**, *431*, 683–694. [CrossRef]

93. Orlando, E.; Strong, A. Galactic synchrotron emission with cosmic ray propagation models. *Mon. Not. R. Astron. Soc.* **2013**, *436*, 2127–2142. [CrossRef]

94. Adam, R.; et al. [Planck Collaboration] Planck intermediate results. XLII. Large-scale Galactic magnetic fields. *Astron. Astrophys.* **2016**, *596*, A103. [CrossRef]

95. Ferrière, K. Plasma turbulence in the interstellar medium. *Plasma Phys. Control. Fusion* **2020**, *62*, 014014. [CrossRef]

96. Chepurnov, A.; Lazarian, A. Extending the Big Power Law in the Sky with Turbulence Spectra from Wisconsin Hα Mapper Data. *Astrophys. J.* **2010**, *710*, 853–858. [CrossRef]

97. Orlando, E. Imprints of cosmic rays in multifrequency observations of the interstellar emission. *Mon. Not. R. Astron. Soc.* **2018**, *475*, 2724–2742. [CrossRef]
98. Orlando, E. Implications on spatial models of interstellar gamma-ray inverse-Compton emission from synchrotron emission studies in radio and microwaves. *Phys. Rev. D* **2019**, *99*, 043007. [CrossRef]

99. IceCube Collaboration. Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector. *Science* **2013**, *342*, 1242856. [CrossRef]

100. Albert, A.; André, M.; Anghinolfi, M.; Ardid, M.; Aubert, J.-J.; Aublin, J.; Avgitas, T.; Baret, B.; Barrios-Martí, J.; Basa, S.; et al. Joint Constraints on Galactic Diffuse Neutrino Emission from the ANTARES and IceCube Neutrino Telescopes. *Astrophys. J. Lett.* **2018**, *868*, L20. [CrossRef]

101. Neufeld, D.A.; Wolfire, M.G. The Cosmic-Ray Ionization Rate in the Galactic Disk, as Determined from Observations of Molecular Ions. *Astrophys. J.* **2017**, *845*, 163. [CrossRef]

102. Phan, V.H.M.; Morlino, G.; Gabici, S. What causes the ionization rates observed in diffuse molecular clouds? The role of cosmic ray protons and electrons. *Mon. Not. R. Astron. Soc.* **2018**, *480*, 5167–5174. [CrossRef]

103. Recchia, S.; Phan, V.H.M.; Biswas, S.; Gabici, S. Can a cosmic ray carrot explain the ionization level in diffuse molecular clouds? *Mon. Not. R. Astron. Soc.* **2019**, *485*, 2276–2280. [CrossRef]

104. Shaw, G.; Ferland, G.J. Roll of Polycyclic Aromatic Hydrocarbons on the Cosmic-Ray ionization rate in the Galaxy. *arXiv* **2021**, arXiv:2101.03732.

105. Tatischeff, V.; Kiener, J. γ-ray lines from cosmic-ray interactions with interstellar dust grains. *New Astron. Rev.* **2004**, *48*, 99–103. [CrossRef]

106. Liu, B.; Yang, R.Z.; Aharonian, F. Nuclear de-excitation lines as a probe of low-energy cosmic rays. *arXiv* **2021**, arXiv:2101.03695.

107. Orlando, E.; Grenier, I.; Tatischeff, V.; Bykov, A.; Caputo, R.; De Angelis, A.; Kiener, J.; Marcowith, A.; McEnery, J.; Strong, A.; et al. Cosmic Rays and interstellar medium with Gamma-Ray Observations at MeV Energies. *arXiv* **2019**, arXiv:1903.05660.

108. Brown, A.G.A.; Vallenari, A.; Prusti, T.; de Bruijne, J.H.J.; Babusiaux, C.; Biermann, M.; Gaia Collaboration. Gaia Early Data Release 3: Summary of the contents and survey properties. *arXiv* **2020**, arXiv:2012.01533.

109. Cantat-Gaudin, T.; Anders, F.; Castro-Ginard, A.; Jordi, C.; Romero-Gómez, M.; Soubiran, C.; Casamiquela, L.; Tarricq, Y.; Moitinho, A.; Vallenari, A.; et al. Painting a portrait of the Galactic disc with its stellar clusters. *Astron. Astrophys.* **2020**, *640*, A1. [CrossRef]

110. Kharchenko, N.V.; Piskunov, A.E.; Schilbach, E.; Röser, S.; Scholz, R.D. Global survey of star clusters in the Milky Way. II. The catalogue of basic parameters. *Astron. Astrophys.* **2013**, *558*, A53. [CrossRef]

111. Reid, M.J.; Menten, K.M.; Brunthaler, A.; Zheng, X.W.; Dame, T.M.; Xu, Y.; Li, J.; Sakai, N.; Wu, Y.; Immer, K.; et al. Trigonometric Parallaxes of High-mass Star-forming Regions: Our View of the Milky Way. *Astrophys. J.* **2019**, *885*, 131. [CrossRef]

112. Berlanas, S.R.; Wright, N.J.; Herrero, A.; Drew, J.E.; Lennon, D.J. Disentangling the spatial substructure of Cygnus OB2 from Gaia DR2. *Mon. Not. R. Astron. Soc.* **2019**, *484*, 1838–1842. [CrossRef]

113. Beasor, E.R.; Davies, B.; Smith, N.; Gehrz, R.D.; Figer, D.F. The Age of Westerlund 1 Revisited. *arXiv* **2021**, arXiv:2103.02609.

114. Braun, R.; Bourke, T.; Green, J.A.; Keane, E.; Wagg, J. Advancing Astrophysics with the Square Kilometre Array. In Proceedings of the Advancing Astrophysics with the Square Kilometre Array (AASKA14), Giardini Naxos, Sicily, Italy, 8–13 June 2015; p. 174.

115. Merloni, A.; Predehl, P.; Becker, W.; Böhringer, H.; Boller, T.; Brunner, H.; Brusa, M.; Dennerl, K.; Freyberg, M.; Friedrich, P.; et al. eROSITA Science Book: Mapping the Structure of the Energetic Universe. *arXiv* **2012**, arXiv:1209.3114.

116. Dermer, C.D.; Finke, J.D.; Murphy, R.J.; Strong, A.W.; Loparco, F.; Mazziotta, M.N.; Orlando, E.; Kamae, T.; Tibaldo, L.; Cohen-Tanugi, J.; et al. On the Physics Connecting Cosmic Rays and Gamma Rays: Towards Determining the Interstellar Cosmic Ray Spectrum. *arXiv* **2013**, arXiv:1303.6482.

117. Lock, W.O.; Measday, D.F. *Intermediate-energy Nuclear Physics*; Methuen: York, UK, 1970.

118. Stecker, F.W. Neutral-Pion Gamma Rays from the Galaxy and the Interstellar Gas Content. *Astrophys. J.* **1973**, *185*, 499–504. [CrossRef]

119. Dermer, C.D. Binary Collision Rates of Relativistic Thermal Plasmas. II. Spectra. *Astrophys. J.* **1986**, *307*, 47. [CrossRef]

120. Adriani, O.; Bonechi, L.; Bongi, M.; Castellini, G.; D'Alessandro, R.; Faus, A.; Fukatsu, K.; Haguenauer, M.; Itow, Y.; Kasahara, K.; et al. Early results of the LHCf experiment and their contribution to ultra-high-energy cosmic ray physics. *Nucl. Phys. B Proc. Suppl.* **2011**, *212*, 270–276. [CrossRef]

121. Sato, H.; Shibata, T.; Yamazaki, R. Revised production cross-section of γ-rays in p-p collisions with LHC data for the study of TeV γ-ray astronomy. *Astropart. Phys.* **2012**, *36*, 83–92. [CrossRef]

122. Aduszkiewicz, A.; et al. [The NA61/SHINE Collaboration] Measurement of meson resonance production in π⁺C interactions at SPS energies. *Eur. Phys. J. C* **2017**, *77*, 626. [CrossRef]

123. Kamae, T.; Karlsson, N.; Mizuno, T.; Abe, T.; Koi, T. Parameterization of γ, e⁺/⁻, and Neutrino Spectra Produced by p-p Interaction in Astronomical Environments. *Astrophys. J.* **2006**, *647*, 692–708. [CrossRef]

124. Kelner, S.R.; Aharonian, F.A.; Bugayov, V.V. Energy spectra of gamma rays, electrons, and neutrinos produced at proton-proton interactions in the very high energy regime. *Phys. Rev. D* **2006**, *74*, 034018. [CrossRef]

125. Kachelrieß, M.; Ostapchenko, S. Deriving the cosmic ray spectrum from gamma-ray observations. *Phys. Rev. D* **2012**, *86*, 043004. [CrossRef]

126. Kafexhiu, E.; Aharonian, F.; Taylor, A.M.; Vila, G.S. Parametrization of gamma-ray production cross sections for p p interactions in a broad proton energy range from the kinematic threshold to PeV energies. *Phys. Rev. D* **2014**, *90*, 123014. [CrossRef]
127. Mazziotta, M.N.; Cerutti, F.; Ferrari, A.; Gaggero, D.; Loparco, F.; Sala, P.R. Production of secondary particles and nuclei in cosmic rays collisions with the interstellar gas using the FLUKA code. *Astropart. Phys.* **2016**, *81*, 21–38. [CrossRef]

128. Kachelrieß, M.; Moskalenko, I.V.; Ostapchenko, S. AAfrag: Interpolation routines for Monte Carlo results on secondary production in proton-proton, proton-nucleus and nucleus-nucleus interactions. *Comput. Phys. Commun.* **2019**, *245*, 106846. [CrossRef]

129. Mori, M. Nuclear enhancement factor in calculation of Galactic diffuse gamma-rays: A new estimate with DPMJET-3. *Astropart. Phys.* **2009**, *31*, 341–343. [CrossRef]

130. Kachelrieß, M.; Moskalenko, I.V.; Ostapchenko, S.S. Nuclear Enhancement of the Photon Yield in Cosmic Ray Interactions. *Astrophys. J.* **2014**, *789*, 136. [CrossRef]

131. Blandford, R.D.; Ostriker, J.P. Particle acceleration by astrophysical shocks. *Astrophys. J. Lett.* **1978**, *221*, L29–L32. [CrossRef]

132. Bell, A.R. The acceleration of cosmic rays in shock fronts. I. MNRAS **1978**, *182*, 147–156. [CrossRef]

133. Axford, W.I.; Leer, E.; Skadron, G. The acceleration of cosmic rays by shock waves. *Int. Cosm. Ray Conf.* **1977**, *11*, 132–137.

134. Krymskii, G.F. A regular mechanism for the acceleration of charged particles on the front of a shock wave. *Akad. Nauk SSSR Dokl.* **1977**, *234*, 1306–1308.

135. Blasi, P. A semi-analytical approach to non-linear shock acceleration. *Astropart. Phys.* **2002**, *16*, 429–439. [CrossRef]

136. Blasi, P. The origin of galactic cosmic rays. *Astron. Astrophys. Rev.* **2013**, *21*, 70. [CrossRef]

137. Antoni, T.; et al. [The KASCADE Collaboration] Large-Scale Cosmic-Ray Anisotropy with KASCADE. *Astrophys. J.* **2004**, *604*, 687. [CrossRef]

138. Abdo, A.A.; Allen, B.T.; Aune, T.; Berley, D.; Casanova, S.; Chen, C.; Dingus, B.L.; Ellsworth, R.W.; Fleysher, L.; Fleysher, R.; et al. The Large-Scale Cosmic-Ray Anisotropy as Observed with Milagro. *Astrophys. J.* **2009**, *698*, 2121. [CrossRef]

139. Aglietta, M.; et al. [The EAS-TOP Collaboration] Evolution of the Cosmic-Ray Anisotropy Above $10^{14}$ eV. *Astrophys. J. Lett.* **2009**, *692*, L130.

140. Amenomori, M.; et al. [The Tibet ASγ Collaboration] Northern Sky Galactic Cosmic Ray Anisotropy between 10 and 1000 TeV with the Tibet Air Shower Array. *Astrophys. J.* **2017**, *836*, 153. [CrossRef]

141. Aartsen, M.G.; et al. [IceCube Collaboration] Observation of Cosmic-Ray Anisotropy with the IceTop Air Shower Array. *Astrophys. J.* **2013**, *765*, 55. [CrossRef]

142. Abbasi, R.; et al. [IceCube Collaboration] Observation of Anisotropy in the Galactic Cosmic-Ray Arrival Directions at 400 TeV with IceCube. *Astrophys. J.* **2012**, *746*, 33. [CrossRef]

143. Cowsik, R.; Pal, Y.; Tandon, S.N.; Verma, R.P. Steady State of Cosmic-Ray Nuclei-Their Spectral Shape and Path Length at Low Energies. *Phys. Rev.* **1967**, *158*, 1238–1242. [CrossRef]

144. Jokipii, J.R. Cosmic-Ray Propagation. I. Charged Particles in a Random Magnetic Field. *Astrophys. J.* **1966**, *146*, 480. [CrossRef]

145. Jokipii, J.R.; Parker, E.N. Random Walk of Magnetic Lines of Force in Astrophysics. *Phys. Rev. Lett.* **1968**, *21*, 44–47. [CrossRef]

146. Berezinsky, V.S.; Bulanov, S.V.; Dogiel, V.A.; Ptuskin, V.S. Astrophysics of Cosmic Rays; North-Holland: Amsterdam, The Netherlands, 1990.

147. Drury, L.O.; Strong, A.W. Power requirements for cosmic ray propagation models involving diffusive reacceleration; estimates and implications for the damping of interstellar turbulence. *Astron. Astrophys.* **2017**, *597*, A117. [CrossRef]

148. Evoli, C.; Gaggero, D.; Vittino, A.; Di Bernardo, G.; Di Mauro, M.; Ligorini, A.; Ullio, P.; Grasso, D. Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients. *J. Cosmol. Astropart. Phys.* **2017**, *2*, 015. [CrossRef]

149. Silberberg, R.; Tsao, C.H. Spallation processes and nuclear interaction products of cosmic rays. *Phys. Rep.* **1990**, *191*, 351–408. [CrossRef]

150. Strong, A.W.; Moskalenko, I.V. Models for galactic cosmic ray propagation. *Adv. Space Res.* **2001**, *27*, 717–726. [CrossRef]

151. Mashnik, S.G.; Sierk, A.J.; Riper, K.A.V.; Wilson, W.B. Production and validation of isotope production cross-section libraries for neutrons and protons to 1.7-GeV. In Proceedings of the 4th Workshop on Simulating Accelerator Radiation Environments (SARE4) (A Satellite Meeting of ACCAPP 98), Knoxville, TN, USA, 13–15 September 1998.

152. Moskalenko, I.V.; Mashnik, S.G.; Strong, A.W. New calculation of radioactive secondaries in cosmic rays. In Proceedings of the 27th International Cosmic Ray Conference, Hamburg, Germany, 7–15 August 2001; Volume 5, p. 1836.

153. Moskalenko, I.V.; Mashnik, S.G. Evaluation of production cross sections of Li, Be, B in CR. In Proceedings of the 28th International Cosmic Ray Conference, Tsukuba, Japan, 31 July–7 August 2003; pp. 1969–1972.

154. Evoli, C.; Gaggero, D.; Vittino, A.; Di Mauro, M.; Grasso, D.; Mazziotta, M.N. Cosmic-ray propagation with DRAGON2: II. Nuclear interactions with the interstellar gas. *arXiv* **2017**, arXiv:astro-ph.HE/1711.09616.

155. Lebrun, F.; Bennett, K.; Bignami, G.F.; Bloemen, J.B.G.M.; Buccheri, R.; Caraveo, P.A.; Gottwald, M.; Hermsen, W.; Kanbach, G.; Mayer-Hasselwander, H.A.; et al. Gamma-rays from atomic and molecular gas in the first galactic quadrant. *Astrophys. J.* **1983**, *274*, 231–236. [CrossRef]

156. Storm, E.; Weniger, C.; Calore, F. SkyFACT: High-dimensional modeling of gamma-ray emission with adaptive templates and penalized likelihoods. *J. Cosmol. Astropart. Phys.* **2017**, *08*, 022. [CrossRef]

157. Malyshev, D. Spectral components analysis of diffuse emission processes. *arXiv* **2012**, arXiv:1202.1034.

158. De Boer, W.; Bosse, L.; Gebauer, I.; Neumann, A.; Biermann, P.L. Molecular clouds as origin of the Fermi gamma-ray GeV excess. *Phys. Rev. D* **2017**, *96*, 043012. [CrossRef]

159. Selig, M.; Vacca, V.; Oppermann, N.; Enßlin, T.A. The denoised, deconvolved, and decomposed Fermi γ-ray sky—An application of the D³PO algorithm. *Astron. Astrophys.* **2015**, *581*, A126. [CrossRef]
160. Strong, A.W.; Youssefi, G. Propagation Models For Cr Nucleons And Electrons And Predictions Of The Galactic Gamma-ray Spectrum. *Int. Cosm. Ray Conf.* **1995**, *3*, 48.

161. Strong, A.W.; Moskalenko, I.V. Propagation of cosmic-ray nucleons in the galaxy. *Astrophys. J.* **1998**, *509*, 212–228. [CrossRef]

162. Moskalenko, I.V.; Strong, A.W. Production and propagation of cosmic ray positrons and electrons. *Astrophys. J.* **1998**, *493*, 694–707. [CrossRef]

163. Evoli, C.; Gaggero, D.; Grasso, D.; Maccione, L. Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: A New Diffusion Model. *J. Cosmol. Astropart. Phys.* **2008**, *0810*, 018. [CrossRef]

164. Gaggero, D.; Maccione, L.; Bernardo, G.D.; Evoli, C.; Grasso, D. Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station. *Phys. Rev. Lett.* **2013**, *111*, 021102. [CrossRef] [PubMed]

165. Kissmann, R. PICARD: A novel code for the Galactic Cosmic Ray propagation problem. *Astropart. Phys.* **2014**, *55*, 37–50. [CrossRef]

166. Werner, M.; Kissmann, R.; Strong, A.W.; Reimer, O. Spiral Arms as Cosmic Ray Source Distributions. *Astropart. Phys.* **2015**, *64*, 18–33. [CrossRef]

167. Maurin, D.; Donato, F.; Taillet, R.; Salati, P. Cosmic rays below z=30 in a diffusion model: New constraints on propagation parameters. *Astrophys. J.* **2001**, *555*, 585–596. [CrossRef]

168. Aguilar, M.; et al. [AMS Collaboration] Precision Measurement of Cosmic-Ray Nitrogen and its Primary and Secondary Components with the Alpha Magnetic Spectrometer on the International Space Station. *Phys. Rev. Lett.* **2018**, *121*, 051103. [CrossRef]

169. Adriani, O.; Barbarino, G.C.; Bazilevskaya, G.A.; Bellotti, R.; Boezio, M.; Bogomolov, E.A.; Bonechi, L.; Bongi, M.; Bonvicini, V.; Bottai, S.; et al. An anomalous positron abundance in cosmic rays with energies 1.5–100 GeV. *Nature* **2009**, *458*, 607–609. [CrossRef] [PubMed]

170. Aguilar, M.; et al. [AMS Collaboration] First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–350 GeV. *Phys. Rev. Lett.* **2013**, *110*, 141102. [CrossRef]

171. Cuoco, A.; Krämer, M.; Korsmeier, M. Novel Dark Matter Constraints from Antiprotons in Light of AMS-02. *Phys. Rev. Lett.* **2017**, *118*, 191102. [CrossRef]

172. Cuoco, A.; Heisig, J.; Klamt, L.; Korsmeier, M.; Krämer, M. Scrutinizing the evidence for dark matter in cosmic-ray antiprotons. *Phys. Rev. D* **2019**, *99*, 103014. [CrossRef]

173. Kissmann, R.; Werner, M.; Reimer, O.; Strong, A.W. Propagation in 3D spiral-arm cosmic-ray source distribution models and secondary particle production using PICARD. *Astropart. Phys.* **2015**, *70*, 39–53. [CrossRef]

174. Kissmann, R.; Niederwanger, F.; Reimer, O.; Strong, A.W. Diffuse gamma rays in 3D galactic cosmic-ray propagation models. *AIP Conf. Proc.* **2017**, 1792, 070011. [CrossRef]

175. Evoli, C.; Gaggero, D.; Grasso, D.; Maccione, L. Common Solution to the Cosmic Ray Anisotropy and Gradient Problems. *Phys. Rev. Lett.* **2012**, *108*, 211102. [CrossRef] [PubMed]

176. Jóhannesson, G.; de Austri, R.R.; Vincent, A.C.; Moskalenko, I.V.; Orlando, E.; Porter, T.A.; Strong, A.W.; Trotta, R.; Feroz, F.; Graff, P.; et al. Bayesian analysis of cosmic-ray propagation: Evidence against homogeneous diffusion. *Astrophys. J.* **2016**, *824*, 16. [CrossRef]

177. Cerri, S.S.; Gaggero, D.; Vittino, A.; Evoli, C.; Grasso, D. A signature of anisotropic cosmic-ray transport in the gamma-ray sky. *J. Cosmol. Astropart. Phys.* **2017**, *10*, 019. [CrossRef]

178. Wentzel, D.G. Cosmic-ray propagation in the galaxy: Collective effects. *Ann. Rev. Astron. Astrophys.* **1974**, *12*, 71–96. [CrossRef]

179. Farmer, A.J.; Goldreich, P. Wave damping by MHD turbulence and its effect upon cosmic ray propagation in the ISM. *Astrophys. J.* **2004**, *604*, 671–674. [CrossRef]

180. Blasi, P.; Amato, E.; Serpico, P.D. Spectral breaks as a signature of cosmic ray induced turbulence in the Galaxy. *Phys. Rev. Lett.* **2012**, *109*, 061101. [CrossRef]

181. Evoli, C.; Blasi, P.; Morlino, G.; Aloisio, R. Origin of the Cosmic Ray Galactic Halo Driven by Advected Turbulence and Self-Generated Waves. *Phys. Rev. Lett.* **2018**, *121*, 021102. [CrossRef]

182. Sridhar, S.; Goldreich, P. Toward a Theory of Interstellar Turbulence. I. Weak Alfvenic Turbulence. *Astrophys. J.* **1994**, *432*, 612. [CrossRef]

183. Goldreich, P.; Sridhar, S. Toward a Theory of Interstellar Turbulence. II. Strong Alfvenic Turbulence. *Astrophys. J.* **1995**, *438*, 763. [CrossRef]

184. Chandran, B.D.G. Scattering of Energetic Particles by Anisotropic Magnetohydrodynamic Turbulence with a Goldreich-Sridhar Power Spectrum. *Phys. Rev. Lett.* **2000**, *85*, 4656–4659. [CrossRef]

185. Yan, H.; Lazarian, A. Scattering of Cosmic Rays by Magnetohydrodynamic Interstellar Turbulence. *Phys. Rev. Lett.* **2002**, *89*, 281102. [CrossRef]

186. Yan, H.; Lazarian, A. Cosmic ray scattering and streaming in compressible magnetohydrodynamic turbulence. *Astrophys. J.* **2004**, *614*, 757–769. [CrossRef]

187. Yan, H.; Lazarian, A. Cosmic Ray Propagation: Nonlinear Diffusion Parallel and Perpendicular to Mean Magnetic Field. *Astrophys. J.* **2008**, *673*, 942. [CrossRef]
188. Evoli, C.; Yan, H. Cosmic ray propagation in galactic turbulence. *Astrophys. J.* **2014**, *782*, 36. [CrossRef]

189. Fornieri, O.; Gaggero, D.; Cerri, S.S.; Luque, P.D.L.T.; Gabici, S. The theory of cosmic-ray scattering on pre-existing MHD modes meets data. *Mon. Not. R. Astron. Soc.* **2021**. [CrossRef]

190. Zhang, H.; Chepurnov, A.; Yan, H.; Makwana, K.; Santos-Lima, R.; Appleby, S. Identification of plasma modes in Galactic turbulence with synchrotron polarization. *Nat. Astron.* **2020**, *4*, 1001–1008. [CrossRef]

191. Ptuskin, V.S.; Jones, F.C.; Seo, E.S.; Sina, R. Effect of random nature of cosmic ray sources Supernova remnants on cosmic ray intensity fluctuations, anisotropy, and electron energy spectrum. *Adv. Space Res.* **2006**, *37*, 1909–1912. [CrossRef]

192. Büsching, I.; Kopp, A.; Pohl, M.; Schlickeiser, R.; Perrot, C.; Grenier, I. Cosmic-Ray Propagation Properties for an Origin in Supernova Remnants. *Astrophys. J.* **2005**, *619*, 314–326. [CrossRef]

193. Blasi, P.; Amato, E. Diffusive propagation of cosmic rays from supernova remnants in the Galaxy. I: Spectrum and chemical composition. *J. Cosmol. Astropart. Phys.* **2012**, *2012*, 010. [CrossRef]

194. Evoli, C.; Morlino, G.; Blasi, P.; Aloisio, R. AMS-02 beryllium data and its implication for cosmic ray transport. *Phys. Rev. D* **2020**, *101*, 023013. [CrossRef]

195. Strong, A.W. Source population synthesis and the Galactic diffuse gamma-ray emission. *Aust. Post Superann. Scheme* **2007**, *309*, 35–41. [CrossRef]

196. Casanova, S.; Dingus, B.L. Constraints on the TeV source population and its contribution to the galactic diffuse TeV emission. *Astropart. Phys.* **2008**, *29*, 63–69. [CrossRef]

197. Steppa, C.; Egberts, K. Modelling the Galactic very-high-energy γ-ray source population. *Astron. Astrophys.* **2020**, *643*, A137. [CrossRef]

198. Bartels, R.; Krishnamurthy, S.; Weniger, C. Strong Support for the Millisecond Pulsar Origin of the Galactic Center GeV Excess. *Phys. Rev. Lett.* **2016**, *116*, 051102. [CrossRef]

199. Leane, R.K.; Slatyer, T.R. Spurious Point Source Signals in the Galactic Center Excess. *Phys. Rev. Lett.* **2020**, *125*, 121105. [CrossRef]

200. Casandjian, J.-M. Local H i Emissivity Measured with Fermi-LAT and Implications for Cosmic-Ray Spectra. *Astrophys. J.* **2015**, *806*, 240. [CrossRef]

201. Ade, P.A.R.; et al. [Planck Collaboration] Planck intermediate results. XXVIII. Interstellar gas and dust in the Chamaeleon clouds as seen by Fermi LAT and Planck. *Astron. Astrophys.* **2015**, *582*, A31. [CrossRef]

202. Remy, Q.; Grenier, I.A.; Marshall, D.J.; Casand, J.M. Cosmic rays, gas and dust in nearby anticentre clouds. I. CO-to-H₂ conversion factors and dust opacities. *Astron. Astrophys.* **2017**, *601*, A78. [CrossRef]

203. Joubaud, T.; Grenier, I.A.; Casandjian, J.M.; Tolksdorf, T.; Schlickeiser, R. The cosmic-ray content of the Orion-Eridanus superbubble. *Astron. Astrophys.* **2020**, *635*, A96. [CrossRef]

204. Abdo, A.A.; Ackermann, M.; Ajello, M.; Atwood, W.B.; Axelsson, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Baughman, B.M.; et al. Fermi LAT Observation of Diffuse Gamma Rays Produced Through Interactions Between Local Interstellar Matter and High-energy Cosmic Rays. *Astrophys. J.* **2009**, *703*, 1249–1256. [CrossRef]

205. Abdo, A.A.; et al. [Fermi/LAT Collaboration] Fermi Observations of Cassiopeia and Cepheus: Diffuse Gamma-ray Emission in the Outer Galaxy. *Astrophys. J.* **2010**, *710*, 133–149. [CrossRef]

206. Ackermann, M.; et al. [Fermi LAT Collaboration] Constraints on the Cosmic-ray Density Gradient Beyond the Solar Circle from Fermi γ-ray Observations of the Third Galactic Quadrant. *Astrophys. J.* **2011**, *726*, 81. [CrossRef]

207. Ackermann, M.; Ajello, M.; Allafort, A.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Belfiore, A.; Bellazzini, R.; Berenji, B.; et al. The cosmic-ray and gas content of the Cygnus region as measured in γ-rays by the Fermi Large Area Telescope. *Astron. Astrophys.* **2012**, *538*, A71. [CrossRef]

208. Ackermann, M.; Ajello, M.; Allafort, A.; Antolini, E.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; et al. Gamma-Ray Observations of the Orion Molecular Clouds with the Fermi Large Area Telescope. *Astrophys. J.* **2012**, *756*, 4. [CrossRef]

209. Ackermann, M.; Ajello, M.; Allafort, A.; Antolini, E.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; et al. Fermi Large Area Telescope Study of Cosmic Rays and the Interstellar Medium in nearby Molecular Clouds. *Astrophys. J.* **2012**, *755*, 22. [CrossRef]

210. Mizuno, T.; Abdollahi, S.; Fukui, Y.; Hayashi, K.; Okumura, A.; Tajima, H.; Yamamoto, H. Quantifying the Interstellar Medium and Cosmic Rays in the MBM 53, 54, and 55 Molecular Clouds and the Pegasus Loop Using Fermi-LAT Gamma-ray Observations. *Astrophys. J.* **2016**, *833*, 278. [CrossRef]

211. Mizuno, T.; Abdollahi, S.; Fukui, Y.; Hayashi, K.; Koyama, T.; Okumura, A.; Tajima, H.; Yamamoto, H. Study of the Cosmic Rays and Interstellar Medium in Local H I Clouds Using Fermi-LAT Gamma-Ray Observations. *Astrophys. J.* **2020**, *890*, 120. [CrossRef]

212. Boschini, M.J.; Della Torre, S.; Gervasi, M.; Grandi, D.; Johannesson, G.; La Vacca, G.; Masi, N.; Moskalenko, I.V.; Pensotti, S.; Porter, T.A.; et al. Inference of the Local Interstellar Spectra of Cosmic-Ray Nuclei $Z \le 28$ with the GALPROP-HELMOD Framework. *Astrophys. J. Suppl. Ser.* **2020**, *250*, 27. [CrossRef]

213. Corti, C.; Bindi, V.; Consolandi, C.; Whitman, K. Solar Modulation of the Local Interstellar Spectrum with Voyager 1, AMS-02, PAMELA, and BESS. *Astrophys. J.* **2016**, *829*, 8. [CrossRef]

214. Strong, A.W.; Moskalenko, I.V.; Reimer, O. Diffuse Continuum Gamma Rays from the Galaxy. *Astrophys. J.* **2000**, *537*, 763–784. [CrossRef]
215. Adriani, O.; Barbarino, G.C.; Bazilevskaya, G.A.; Bellotti, R.; Boezio, M.; Bogomolov, E.A.; Bonechi, L.; Bongi, M.; Bonvicini, V.; Borisov, S.; et al. PAMELA Measurements of Cosmic-Ray Proton and Helium Spectra. *Science* **2011**, *332*, 69. [CrossRef]

216. Engelmann, J.J.; Ferrando, P.; Soutoul, A.; Goret, P.; Juliusson, E.; Koch-Miramond, L.; Lund, N.; Masse, P.; Peters, B.; Petrou, N.; et al. Charge composition and energy spectra of cosmic-ray nuclei for elements from Be to Ni - Results from HEAO-3-C2. *Astron. Astrophys.* **1990**, *233*, 96–111.

217. Ostapchenko, S. Monte Carlo treatment of hadronic interactions in enhanced Pomeron scheme: QGSJET-II model. *Phys. Rev. D* **2011**, *83*, 014018. [CrossRef]

218. Strong, A.W. Local interstellar cosmic-ray spectra derived from gamma-ray emissivities. *arXiv* **2015**, arXiv:1507.05006.

219. Bertram, E.; Glover, S.C.O.; Clark, P.C.; Ragan, S.E.; Klessen, R.S. Synthetic observations of molecular clouds in a galactic centre environment—I. Studying maps of column density and integrated intensity. *Mon. Not. R. Astron. Soc.* **2016**, *455*, 3763–3778. [CrossRef]

220. Skilling, J.; Strong, A.W. Cosmic ray exclusion from dense molecular clouds. *Astron. Astrophys.* **1976**, *53*, 253–258.

221. Everett, J.E.; Zweibel, E.G. The Interaction of Cosmic Rays with Diffuse Clouds. *Astrophys. J.* **2011**, *739*, 60. [CrossRef]

222. Padovani, M.; Galli, D. Effects of magnetic fields on the cosmic-ray ionization of molecular cloud cores. *Astron. Astrophys.* **2011**, *530*, A109. [CrossRef]

223. Yang, R.; de Oña Wilhelmi, E.; Aharonian, F. Probing cosmic rays in nearby giant molecular clouds with the Fermi Large Area Telescope. *Astron. Astrophys.* **2014**, *566*, A142. [CrossRef]

224. Neronov, A.; Malyshev, D.; Semikoz, D.V. Cosmic-ray spectrum in the local Galaxy. *Astron. Astrophys.* **2017**, *606*, A22. [CrossRef]

225. Baghmanyan, V.; Peron, G.; Casanova, S.; Aharonian, F.; Zanin, R. Evidence of Cosmic-Ray Excess from Local Giant Molecular Clouds. *Astrophys. J. Lett.* **2020**, *901*, L4. [CrossRef]

226. Albert, A.; Alfaro, R.; Alvarez, C.; Angeles Camacho, J.R.; Arteaga-Velázquez, J.C.; Arunbabu, K.P.; Avila Rojas, D.; Ayala Solares, H.A.; Baghmanyan, V.; Belmont-Moreno, E.; et al. Probing the Sea of Cosmic Rays by Measuring Gamma-Ray Emission from Passive Giant Molecular Clouds. *arXiv* **2021**, arXiv:2101.08748.

227. Strong, A.W.; Bloemen, J.B.G.M.; Dame, T.M.; Grenier, I.A.; Hermsen, W.; Lebrun, F.; Nyman, L.-Å.; Pollock, A.M.T.; Thaddeus, P. The radial distribution of galactic gamma rays. IV. The whole galaxy. *Astron. Astrophys.* **1988**, *207*, 1–15.

228. Bignami, G.F.; Fichtel, C.E.; Kniffen, D.A.; Thompson, D.J. High-energy galactic gamma radiation from cosmic rays concentrated in spiral arms. *Astrophys. J.* **1975**, *199*, 54–60. [CrossRef]

229. Acero, F.; Ackermann, M.; Ajello, M.; Albert, A.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bellazzini, R.; Bissaldi, E.; et al. Development of the Model of Galactic Interstellar Emission for Standard Point-source Analysis of Fermi Large Area Telescope Data. *Astrophys. J. Suppl. Ser.* **2016**, *223*, 26. [CrossRef]

230. Yang, R.; Aharonian, F.; Evoli, C. Radial distribution of the diffuse γ-ray emissivity in the Galactic disk. *Phys. Rev. D* **2016**, *93*, 123007. [CrossRef]

231. Pothast, M.; Gaggero, D.; Storm, E.; Weniger, C. On the progressive hardening of the cosmic-ray proton spectrum in the inner Galaxy. *J. Cosmol. Astropart. Phys.* **2018**, *10*, 045. [CrossRef]

232. Acero, F.; et al. [The Fermi-LAT Collaboration] Fermi Large Area Telescope Third Source Catalog. *Astrophys. J. Suppl. Ser.* **2015**, *218*, 23. [CrossRef]

233. Aharonian, F.; Peron, G.; Yang, R.; Casanova, S.; Zanin, R. Probing the sea of galactic cosmic rays with Fermi-LAT. *Phys. Rev. D* **2020**, *101*, 083018. [CrossRef]

234. Peron, G.; Aharonian, F.; Casanova, S.; Yang, R.; Zanin, R. Probing the Cosmic-Ray Density in the Inner Galaxy. *Astrophys. J. Lett.* **2021**, *907*, L11. [CrossRef]

235. Issa, M.R.; MacLaren, I.; Wolfendale, A.W. Dust-to-gas ratio and metallicity variations in nearby galaxies. *Astron. Astrophys.* **1990**, *236*, 237.

236. Boissier, S.; Boselli, A.; Buat, V.; Donas, J.; Milliard, B. The radial extinction profiles of late-type galaxies. *Astron. Astrophys.* **2004**, *424*, 465–476. [CrossRef]

237. Muñoz-Mateos, J.C.; Gil de Paz, A.; Boissier, S.; Zamorano, J.; Dale, D.A.; Pérez-González, P.G.; Gallego, J.; Madore, B.F.; Bendo, G.; Thornley, M.D.; et al. Radial Distribution of Stars, Gas, and Dust in Sings Galaxies. II. Derived Dust Properties. *Astrophys. J.* **2009**, *701*, 1965–1991. [CrossRef]

238. Ackermann, M.; et al. [The Fermi-LAT Collaboration] Fermi-LAT Observations of the Diffuse γ-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium. *Astrophys. J.* **2012**, *750*, 3. [CrossRef]

239. Porter, T.A.; Moskalenko, I.V.; Strong, A.W.; Orlando, E.; Bouchet, L. Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge. *Astrophys. J.* **2008**, *682*, 400–407. [CrossRef]

240. Bouchet, L.; Strong, A.W.; Porter, T.A.; Moskalenko, I.V.; Jourdain, E.; Roques, J.-P. Diffuse Emission Measurement with the SPectrometer on INTEGRAL as an Indirect Probe of Cosmic-Ray Electrons and Positrons. *Astrophys. J.* **2011**, *739*, 29. [CrossRef]

241. Churazov, E.; Bouchet, L.; Jean, P.; Jourdain, E.; Knödlseder, J.; Krivonos, R.; Roques, J.-P.; Sazonov, S.; Siegert, T.; Strong, A.; et al. INTEGRAL results on the electron-positron annihilation radiation and X-ray & Gamma-ray diffuse emission of the Milky Way. New Astron. Rev. **2020**, *90*, 101548. [CrossRef]

242. Abdo, A.A.; Allen, B.; Aune, T.; Berley, D.; Blaufuss, E.; Casanova, S.; Chen, C.; Dingus, B.L.; Ellsworth, R.W.; Fleysher, L.; et al. A Measurement of the Spatial Distribution of Diffuse TeV Gamma-Ray Emission from the Galactic Plane with Milagro. *Astrophys. J.* **2008**, *688*, 1078–1083. [CrossRef]
243. Bartoli, B.; Bernardini, P.; Bi, X.J.; Branchini, P.; Budano, A.; Camarri, P.; Cao, Z.; Cardarelli, R.; Catalanotti, S.; Chen, S.Z.; et al. Study of the Diffuse Gamma-Ray Emission from the Galactic Plane with ARGO-YBJ. *Astrophys. J.* **2015**, *806*, 20. [CrossRef]

244. Zhou, H.; Rho, C.D.; Vianello, G.; HAWC Collaboration. Probing Galactic Diffuse TeV Gamma-Ray Emission with the HAWC Observatory. In *Proceedings of the 35th International Cosmic Ray Conference (ICRC2017)*, Busan, Korea, 12–20 July 2017; Volume 301, p. 689.

245. Amenomori, M.; et al. [Tibet ASγ Collaboration] First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies. *Phys. Rev. Lett.* **2021**, *126*, 141101. [CrossRef] [PubMed]

246. Neronov, A.; Semikoz, D. Galactic diffuse gamma-ray emission at TeV energy. *Astron. Astrophys.* **2020**, *633*, A94. [CrossRef]

247. Pagliaroli, G.; Cataldo, M.; Vecchiotti, V.; Villante, F.L. Can the TeV gamma-ray sky probe the galactic cosmic ray distribution? In *Journal of Physics Conference Series*; IOP Publishing: Bristol, UK, 2020; Volume 1468, p. 012099. [CrossRef]

248. Neronov, A.; Semikoz, D. Mapping large-scale diffuse γ-ray emission in the 10-100 TeV band with Cherenkov telescopes. *Astron. Astrophys.* **2020**, *637*, A44. [CrossRef]

249. Neronov, A.; Semikoz, D. LHAASO telescope sensitivity to diffuse gamma-ray signals from the Galaxy. *Phys. Rev. D* **2020**, *102*, 043025. [CrossRef]

250. Gaggero, D.; Urbano, A.; Valli, M.; Ullio, P. Gamma-ray sky points to radial gradients in cosmic-ray transport. *Phys. Rev. D* **2015**, *91*, 083012. [CrossRef]

251. Recchia, S.; Blasi, P.; Morlino, G. On the radial distribution of Galactic cosmic rays. *Mon. Not. Roy. Astron. Soc.* **2016**, *462*, L88–L92. [CrossRef]

252. Ferrière, K.M. The interstellar environment of our galaxy. *Rev. Mod. Phys.* **2001**, *73*, 1031–1066. [CrossRef]

253. Marco, D.D.; Blasi, P.; Stanev, T. Numerical propagation of high energy cosmic rays in the Galaxy. I. Technical issues. *J. Cosmol. Astropart. Phys.* **2007**, *06*, 027. [CrossRef]

254. Snodin, A.P.; Shukurov, A.; Sarson, G.R.; Bushby, P.J.; Rodrigues, L.F.S. Global diffusion of cosmic rays in random magnetic fields. *Mon. Not. Roy. Astron. Soc.* **2016**, *457*, 3975–3987. [CrossRef]

255. Dundovic, A.; Pezzi, O.; Blasi, P.; Evoli, C.; Matthaeus, W.H. Novel aspects of cosmic ray diffusion in synthetic magnetic turbulence. *Phys. Rev. D* **2020**, *102*, 103016. [CrossRef]

256. Gaggero, D.; Grasso, D.; Marinelli, A.; Taoso, M.; Urbano, A. Diffuse cosmic rays shining in the Galactic center: A novel interpretation of H.E.S.S. and Fermi-LAT gamma-ray data. *Phys. Rev. Lett.* **2017**, *119*, 031101. [CrossRef] [PubMed]

257. Lipari, P.; Vernetto, S. Diffuse Galactic gamma ray flux at very high energy. *Phys. Rev. D* **2018**, *98*, 043003. [CrossRef]

258. Gaggero, D.; Grasso, D.; Marinelli, A.; Urbano, A.; Valli, M. The gamma-ray and neutrino sky: A consistent picture of Fermi-LAT, Milagro, and IceCube results. *Astrophys. J. Lett.* **2015**, *815*, L25. [CrossRef]

259. Pagliaroli, G.; Villante, F.L. A multi-messenger study of the total galactic high-energy neutrino emission. *J. Cosmol. Astropart. Phys.* **2018**, *08*, 035. [CrossRef]

260. Aartsen, M.G.; et al. [IceCube Collaboration] Search for Sources of Astrophysical Neutrinos Using Seven Years of IceCube Cascade Events. *Astrophys. J.* **2019**, *886*, 12. [CrossRef]

261. Ackermann, M.; Albert, A.; Atwood, W.B.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bellazzini, R.; Bissaldi, E.; Bloom, E.D.; et al. Deep view of the Large Magellanic Cloud with six years of Fermi-LAT observations. *Astron. Astrophys.* **2016**, *586*, A71. [CrossRef]

262. Scowcroft, V.; Freedman, W.L.; Madore, B.F.; Monson, A.; Persson, S.E.; Rich, J.; Seibert, M.; Rigby, J.R. The Carnegie Hubble Program: The Distance and Structure of the SMC as Revealed by Mid-infrared Observations of Cepheids. *Astrophys. J.* **2016**, *816*, 49. [CrossRef]

263. Abdo, A.A.; et al. [The Fermi/LAT collaboration] Detection of the Small Magellanic Cloud in gamma-rays with Fermi/LAT. *Astron. Astrophys.* **2010**, *523*, A46. [CrossRef]

264. Caputo, R.; Buckley, M.R.; Martin, P.; Charles, E.; Brooks, A.M.; Drlica-Wagner, A.; Gaskins, J.M.; Wood, M. Search for gamma-ray emission from dark matter annihilation in the Small Magellanic Cloud with the Fermi Large Area Telescope. *Phys. Rev. D* **2016**, *93*, 062004. [CrossRef]

265. Abdo, A.A.; Ackermann, M.; Ajello, M.; Atwood, W.B.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Baughman, B.M.; Bechtol, K.; et al. Observations of the Large Magellanic Cloud with Fermi. *Astron. Astrophys.* **2010**, *512*, A7+. [CrossRef]

266. Ackermann, M.; et al. [The Fermi-LAT Collaboration] Observations of M31 and M33 with the Fermi Large Area Telescope: A Galactic Center Excess in Andromeda? *Astrophys. J.* **2017**, *836*, 208. [CrossRef]

267. Weinrich, N.; Boudaud, M.; Derome, L.; Génolini, Y.; Lavalle, J.; Maurin, D.; Salati, P.; Serpico, P.; Weymann-Despres, G. Galactic halo size in the light of recent AMS-02 data. *Astron. Astrophys.* **2020**, *639*, A74. [CrossRef]

268. Dahlem, M.; Dettmar, R.J.; Hummel, E. Spatially correlated diffuse Hα and radio continuum emission from the halo of NGC 891. *Astron. Astrophys.* **1994**, *290*, 384–392.

269. Tibaldo, L.; Digel, S.W.; Casandjian, J.-M.; Franckowiak, A.; Grenier, I.A.; Johannesson, G.; Marshall, D.J.; Moskalenko, I.V.; Negro, M.; Orlando, E.; et al. Fermi-LAT Observations of High- and Intermediate-velocity Clouds: Tracing Cosmic Rays in the Halo of the Milky Way. *Astrophys. J.* **2015**, *807*, 161. [CrossRef]

270. Wakker, B.P. Distances and Metallicities of High- and Intermediate-Velocity Clouds. *Astrophys. J. Suppl. Ser.* **2001**, *136*, 463–535. [CrossRef]
271. Joubaud, T.; Grenier, I.A.; Ballet, J.; Soler, J.D. Gas shells and magnetic fields in the Orion-Eridanus superbubble. *Astron. Astrophys.* **2019**, *631*, A52. [CrossRef]

272. Brown, A.G.A.; et al. [Gaia Collaboration] Gaia Data Release 2. Summary of the contents and survey properties. *Astron. Astrophys.* **2018**, *616*, A1. [CrossRef]

273. Pshirkov, M.S.; Vasiliev, V.V.; Postnov, K.A. Evidence of Fermi bubbles around M31. *Mon. Not. R. Astron. Soc.* **2016**, *459*, L76–L80. [CrossRef]

274. Karwin, C.M.; Murgia, S.; Campbell, S.; Moskalenko, I.V. Fermi-LAT Observations of γ-Ray Emission toward the Outer Halo of M31. *Astrophys. J.* **2019**, *880*, 95. [CrossRef]

275. Recchia, S.; Gabici, S.; Aharonian, F.A.; Niro, V. Giant cosmic ray halos around M31 and the Milky Way. *arXiv* **2021**, arXiv:2101.05016.

276. Recchia, S.; Blasi, P.; Morlino, G. Cosmic ray driven Galactic winds. *Mon. Not. R. Astron. Soc.* **2016**, *462*, 4227–4239. [CrossRef]

277. Holguin, F.; Ruszkowski, M.; Lazarian, A.; Farber, R.; Yang, H.Y.K. Role of cosmic-ray streaming and turbulent damping in driving galactic winds. *Mon. Not. R. Astron. Soc.* **2019**, *490*, 1271–1282. [CrossRef]

278. Dogiel, V.A.; Ivlev, A.V.; Chernyshov, D.O.; Ko, C.M. Formation of the Cosmic-Ray Halo: Galactic Spectrum of Primary Cosmic Rays. *Astrophys. J.* **2020**, *903*, 135. [CrossRef]

279. Feldmann, R.; Hooper, D.; Gnedin, N.Y. Circum-galactic Gas and the Isotropic Gamma-Ray Background. *Astrophys. J.* **2013**, *763*, 21. [CrossRef]

280. Blasi, P.; Amato, E. Escape of Cosmic Rays from the Galaxy and Effects on the Circumgalactic Medium. *Phys. Rev. Lett.* **2019**, *122*, 051101. [CrossRef]

281. Ackermann, M.; Ajello, M.; Allafort, A.; Baldini, L.; Ballet, J.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; Berenji, B.; Bloom, E.D.; et al. GeV Observations of Star-forming Galaxies with the Fermi Large Area Telescope. *Astrophys. J.* **2012**, *755*, 164. [CrossRef]

282. Dobler, G.; Finkbeiner, D.P.; Cholis, I.; Slatyer, T.R.; Weiner, N. The Fermi Haze: A Gamma-Ray Counterpart to the Microwave Haze. *Astrophys. J.* **2010**, *717*, 825–842. [CrossRef]

283. Su, M.; Slatyer, T.R.; Finkbeiner, D.P. Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind? *Astrophys. J.* **2010**, *724*, 1044–1082. [CrossRef]

284. Ackermann, M.; et al. [The Fermi-LAT Collaboration] The Spectrum and Morphology of the Fermi Bubbles. *Astrophys. J.* **2014**, *793*, 64. [CrossRef]

285. Yang, H.Y.; Ruszkowski, M.; Zweibel, E. Unveiling the Origin of the Fermi Bubbles. *Galaxies* **2018**, *6*, 29. [CrossRef]

286. Murgia, S. The Fermi?LAT Galactic Center Excess: Evidence of Annihilating Dark Matter? *Annu. Rev. Nucl. Part. Sci.* **2020**, *70*, 455–483. [CrossRef]

287. Porter, T.A.; Jóhannesson, G.; Moskalenko, I.V. Deciphering Residual Emissions: Time-dependent Models for the Nonthermal Interstellar Radiation from the Milky Way. *Astrophys. J.* **2019**, *887*, 250. [CrossRef]

288. D'Angelo, M.; Blasi, P.; Amato, E. Grammage of cosmic rays around Galactic supernova remnants. *Phys. Rev. D* **2016**, *94*, 083003. [CrossRef]

289. D'Angelo, M.; Morlino, G.; Amato, E.; Blasi, P. Diffuse gamma-ray emission from self-confined cosmic rays around Galactic sources. *Mon. Not. R. Astron. Soc.* **2018**, *474*, 1944–1954. [CrossRef]

290. Jóhannesson, G.; Porter, T.A.; Moskalenko, I.V. Cosmic-Ray Propagation in Light of the Recent Observation of Geminga. *Astrophys. J.* **2019**, *879*, 91. [CrossRef]

291. Abeysekara, A.U.; Albert, A.; Alfaro, R.; Alvarez, C.; Álvarez, J.D.; Arceo, R.; Arteaga-Velázquez, J.C.; Avila Rojas, D.; Ayala Solares, H.A.; Barber, A.S.; et al. Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth. *Science* **2017**, *358*, 911–914. [CrossRef] [PubMed]

292. Profumo, S.; Reynoso-Cordova, J.; Kaaz, N.; Silverman, M. Lessons from HAWC pulsar wind nebulae observations: The diffusion constant is not a constant; pulsars remain the likeliest sources of the anomalous positron fraction; cosmic rays are trapped for long periods of time in pockets of inefficient diffusion. *Phys. Rev. D* **2018**, *97*, 123008. [CrossRef]

293. Manconi, S.; Di Mauro, M.; Donato, F. Contribution of pulsars to cosmic-ray positrons in light of recent observation of inverse-Compton halos. *Phys. Rev. D* **2020**, *102*, 023015. [CrossRef]

294. Nava, L.; Gabici, S.; Marcowith, A.; Morlino, G.; Ptuskin, V.S. Non-linear diffusion of cosmic rays escaping from supernova remnants - I. The effect of neutrals. *Mon. Not. R. Astron. Soc.* **2016**, *461*, 3552–3562. [CrossRef]

295. Nava, L.; Recchia, S.; Gabici, S.; Marcowith, A.; Brahimi, L.; Ptuskin, V. Non-linear diffusion of cosmic rays escaping from supernova remnants - II. Hot ionized media. *Mon. Not. R. Astron. Soc.* **2019**, *484*, 2684–2691. [CrossRef]

296. Schroer, B.; Pezzi, O.; Caprioli, D.; Haggerty, C.; Blasi, P. Dynamical effects of cosmic rays leaving their sources. *arXiv* **2020**, arXiv:2011.02238.

297. Ptuskin, V.S.; Zirakashvili, V.N. On the spectrum of high-energy cosmic rays produced by supernova remnants in the presence of strong cosmic-ray streaming instability and wave dissipation. *Astron. Astrophys.* **2005**, *429*, 755–765. [CrossRef]

298. Drury, L.O. Escaping the accelerator: How, when and in what numbers do cosmic rays get out of supernova remnants? *Mon. Not. R. Astron. Soc.* **2011**, *415*, 1807–1814. [CrossRef]

299. Bell, A.R.; Schure, K.M.; Reville, B.; Giacinti, G. Cosmic-ray acceleration and escape from supernova remnants. *Mon. Not. R. Astron. Soc.* **2013**, *431*, 415–429. [CrossRef]
300. Mitchell, A.M.W.; Rowell, G.P.; Celli, S.; Einecke, S. Using interstellar clouds to search for Galactic PeVatrons: Gamma-ray signatures from supernova remnants. *Mon. Not. R. Astron. Soc.* **2021**, *503*, 3522–3539. [CrossRef]

301. Cristofari, P.; Blasi, P.; Amato, E. The low rate of Galactic pevatrons. *Astropart. Phys.* **2020**, *123*, 102492. [CrossRef]

302. Malkov, M.A.; Diamond, P.H.; Sagdeev, R.Z.; Aharonian, F.A.; Moskalenko, I.V. Analytic Solution for Self-regulated Collective Escape of Cosmic Rays from Their Acceleration Sites. *Astrophys. J.* **2013**, *768*, 73. [CrossRef]

303. Brahimi, L.; Marcowith, A.; Ptuskin, V.S. Nonlinear diffusion of cosmic rays escaping from supernova remnants: Cold partially neutral atomic and molecular phases. *Astron. Astrophys.* **2020**, *633*, A72. [CrossRef]

304. Giacinti, G.; Kachelrieß, M.; Semikoz, D.V. Anisotropic cosmic ray diffusion and its implications for gamma-ray astronomy. *Phys. Rev. D* **2013**, *88*, 023010. [CrossRef]

305. Abdalla, H.; et al. [H. E. S. S. Collaboration] H.E.S.S. observations of RX J1713.7-3946 with improved angular and spectral resolution: Evidence for gamma-ray emission extending beyond the X-ray emitting shell. *Astron. Astrophys.* **2018**, *612*, A6. [CrossRef]

306. Cui, Y.; Yeung, P.K.H.; Tam, P.H.T.; Pühlhofer, G. Leaked GeV CRs from a Broken Shell: Explaining 9 Years of Fermi-LAT Data of SNR W28. *Astrophys. J.* **2018**, *860*, 69. [CrossRef]

307. Uchiyama, Y.; Blandford, R.D.; Funk, S.; Tajima, H.; Tanaka, T. Gamma-ray Emission from Crushed Clouds in Supernova Remnants. *Astrophys. J. Lett.* **2010**, *723*, L122–L126. [CrossRef]

308. Abdollahi, S.; et al. [The Fermi-LAT collaboration] Fermi Large Area Telescope Fourth Source Catalog. *Astrophys. J. Suppl. Ser.* **2020**, *247*, 33. [CrossRef]

309. Gabici, S.; Aharonian, F.A.; Blasi, P. Gamma rays from molecular clouds. *Aust. Post Superann. Scheme* **2007**, *309*, 365–371. [CrossRef]

310. Hanabata, Y.; Katagiri, H.; Hewitt, J.W.; Ballet, J.; Fukazawa, Y.; Fukui, Y.; Hayakawa, T.; Lemoine-Goumard, M.; Pedaletti, G.; Strong, A.W.; et al. Detailed Investigation of the Gamma-Ray Emission in the Vicinity of SNR W28 with FERMI-LAT. *Astrophys. J.* **2014**, *786*, 145. [CrossRef]

311. Celli, S.; Morlino, G.; Gabici, S.; Aharonian, F.A. Exploring particle escape in supernova remnants through gamma rays. *Mon. Not. R. Astron. Soc.* **2019**, *490*, 4317–4333. [CrossRef]

312. Acciari, V.A.; et al. [MAGIC Collaboration] Study of the GeV to TeV morphology of the γ-Cygni SNR (G78.2+2.1) with MAGIC and Fermi-LAT. *arXiv* **2020**, arXiv:2010.15854.

313. Acero, F.; et al. [The Fermi-LAT Collaboration] The First Fermi LAT Supernova Remnant Catalog. *Astrophys. J. Suppl. Ser.* **2016**, *224*, 8. [CrossRef]

314. Uchiyama, Y.; Funk, S.; Katagiri, H.; Katsuta, J.; Lemoine-Goumard, M.; Tajima, H.; Tanaka, T.; Torres, D.F. Fermi Large Area Telescope Discovery of GeV Gamma-Ray Emission from the Vicinity of SNR W44. *Astrophys. J. Lett.* **2012**, *749*, L35. [CrossRef]

315. Eagle, J.; Marchesi, S.; Castro, D.; Ajello, M.; Vendrasco, A. Gamma-Ray Emission Revealed at the Western Edge of SNR G344.7-0.1. *Astrophys. J.* **2020**, *904*, 123. [CrossRef]

316. Eagle, J.; Marchesi, S.; Castro, D.; Ajello, M.; Duvidovich, L.; Tibaldo, L. 2FHL J0826.1-4500: Discovery of a Possible Shock-Cloud Interaction on the Western Edge of the Vela Supernova Remnant. *Astrophys. J.* **2019**, *870*, 35. [CrossRef]

317. Tang, X. Gamma-ray emission from middle-aged supernova remnants interacting with molecular clouds: The challenge for current models. *Mon. Not. R. Astron. Soc.* **2019**, *482*, 3843–3856. [CrossRef]

318. Ackermann, M.; Ajello, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bellazzini, R.; Bissaldi, E.; Bloom, E.D.; Bonino, R.; et al. Search for Extended Sources in the Galactic Plane Using Six Years of Fermi-Large Area Telescope Pass 8 Data above 10 GeV. *Astrophys. J.* **2017**, *843*, 139. [CrossRef]

319. Pivato, G.; Hewitt, J.W.; Tibaldo, L.; Acero, F.; Ballet, J.; Brandt, T.J.; de Palma, F.; Giordano, F.; Janssen, G.H.; Jóhannesson, G.; et al. Fermi LAT and WMAP Observations of the Supernova Remnant HB 21. *Astrophys. J.* **2013**, *779*, 179. [CrossRef]

320. Ambrogi, L.; Zanin, R.; Casanova, S.; De Oña Wilhelmi, E.; Peron, G.; Aharonian, F. Spectral and morphological study of the gamma radiation of the middle-aged supernova remnant HB 21. *Astron. Astrophys.* **2019**, *623*, A86. [CrossRef]

321. Gaensler, B.M.; Slane, P.O. The Evolution and Structure of Pulsar Wind Nebulae. *Annu. Rev. Astron. Astrophys.* **2006**, *44*, 17–47. [CrossRef]

322. Bucciantini, N.; Olmi, B.; Del Zanna, L. 3D Relativistic MHD Simulations of Pulsar Bow Shock Nebulae. In *Journal of Physics Conference Series*; IOP Publishing: Bristol, UK, 2020; Volume 1623, p. 012002. [CrossRef]

323. Giacinti, G.; Mitchell, A.M.W.; López-Coto, R.; Joshi, V.; Parsons, R.D.; Hinton, J.A. On the TeV Halo Fraction in gamma-ray bright Pulsar Wind Nebulae. *arXiv* **2019**, arXiv:1907.12121.

324. Linden, T.; Auchettl, K.; Bramante, J.; Cholis, I.; Fang, K.; Hooper, D.; Karwal, T.; Li, S.W. Using HAWC to discover invisible pulsars. *Phys. Rev. D* **2017**, *96*, 103016. [CrossRef]

325. Di Mauro, M.; Manconi, S.; Donato, F. Evidences of low-diffusion bubbles around Galactic pulsars. *arXiv* **2019**, arXiv:1908.03216.

326. Sudoh, T.; Linden, T.; Beacom, J.F. TeV halos are everywhere: Prospects for new discoveries. *Phys. Rev. D* **2019**, *100*, 043016. [CrossRef]

327. Hooper, D.; Linden, T. Millisecond pulsars, TeV halos, and implications for the Galactic Center gamma-ray excess. *Phys. Rev. D* **2018**, *98*, 043005. [CrossRef]

328. Linden, T.; Buckman, B.J. Pulsar TeV Halos Explain the Diffuse TeV Excess Observed by Milagro. *Phys. Rev. Lett.* **2018**, *120*, 121101. [CrossRef] [PubMed]
329. Di Mauro, M.; Manconi, S.; Donato, F. Detection of a γ-ray halo around Geminga with the Fermi-LAT data and implications for the positron flux. *Phys. Rev. D* **2019**, *100*, 123015. [CrossRef]

330. Giacinti, G.; Mitchell, A.M.W.; López-Coto, R.; Joshi, V.; Parsons, R.D.; Hinton, J.A. Halo fraction in TeV-bright pulsar wind nebulae. *Astron. Astrophys.* **2020**, *636*, A113. [CrossRef]

331. Evoli, C.; Linden, T.; Morlino, G. Self-generated cosmic-ray confinement in TeV halos: Implications for TeV γ-ray emission and the positron excess. *Phys. Rev. D* **2018**, *98*, 063017. [CrossRef]

332. López-Coto, R.; Giacinti, G. Constraining the properties of the magnetic turbulence in the Geminga region using HAWC γ-ray data. *Mon. Not. R. Astron. Soc.* **2018**, *479*, 4526–4534. [CrossRef]

333. Ferrand, G.; Marcowith, A. On the shape of the spectrum of cosmic rays accelerated inside superbubbles. *Astron. Astrophys.* **2010**, *510*, A101. [CrossRef]

334. Montmerle, T. On gamma-ray sources, supernova remnants, OB associations, and the origin of cosmic rays. *Astrophys. J.* **1979**, *231*, 95–110. [CrossRef]

335. Bykov, A.M. Particle Acceleration and Nonthermal Phenomena in Superbubbles. *Space Sci. Rev.* **2001**, *99*, 317–326. [CrossRef]

336. Parizot, E.; Marcowith, A.; van der Swaluw, E.; Bykov, A.M.; Tatischeff, V. Superbubbles and energetic particles in the Galaxy. I. Collective effects of particle acceleration. *Astron. Astrophys.* **2004**, *424*, 747–760. [CrossRef]

337. Seo, J.; Kang, H.; Ryu, D. The Contribution of Stellar Winds to Cosmic Ray Production. *J. Korean Astron. Soc.* **2018**, *51*, 37–48. [CrossRef]

338. Morlino, G.; Blasi, P.; Peretti, E.; Cristofari, P. Particle acceleration in winds of star clusters. *Mon. Not. R. Astron. Soc.* **2021**, [CrossRef]

339. Tolksdorf, T.; Grenier, I.A.; Joubaud, T.; Schlickeiser, R. Cosmic Rays in Superbubbles. *Astrophys. J.* **2019**, *879*, 66. [CrossRef]

340. Bykov, A.M.; Marcowith, A.; Amato, E.; Kalyashova, M.E.; Kruijssen, J.M.D.; Waxman, E. High-Energy Particles and Radiation in Star-Forming Regions. *Space Sci. Rev.* **2020**, *216*, 42. [CrossRef]

341. Bykov, A.M.; Ellison, D.C.; Gladilin, P.E.; Osipov, S.M. Supernovae in compact star clusters as sources of high-energy cosmic rays and neutrinos. *Adv. Space Res.* **2018**, *62*, 2764–2772. [CrossRef]

342. Binns, W.R.; Israel, M.H.; Christian, E.R.; Cummings, A.C.; de Nolfo, G.A.; Lave, K.A.; Leske, R.A.; Mewaldt, R.A.; Stone, E.C.; von Rosenvinge, T.T.; et al. Observation of the $^{60}$Fe nucleosynthesis-clock isotope in galactic cosmic rays. *Science* **2016**, *352*, 677–680. [CrossRef]

343. Israel, M.H.; Lave, K.A.; Wiedenbeck, M.E.; Binns, W.R.; Christian, E.R.; Cummings, A.C.; Davis, A.J.; de Nolfo, G.A.; Leske, R.A.; Mewaldt, R.A.; et al. Elemental Composition at the Cosmic-Ray Source Derived from the ACE-CRIS Instrument. I. $^{6}$C to $^{28}$Ni. *Astrophys. J.* **2018**, *865*, 69. [CrossRef]

344. Ackermann, M.; Ajello, M.; Allafort, A.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Belfiore, A.; Bellazzini, R.; Berenji, B.; et al. A Cocoon of Freshly Accelerated Cosmic Rays Detected by Fermi in the Cygnus Superbubble. *Science* **2011**, *334*, 1103. [CrossRef] [PubMed]

345. Saha, L.; Domínguez, A.; Tibaldo, L.; Marchesi, S.; Ajello, M.; Lemoine-Goumard, M.; López, M. Morphological and Spectral Study of 4FGL J1115.1-6118 in the Region of the Young Massive Stellar Cluster NGC 3603. *Astrophys. J.* **2020**, *897*, 131. [CrossRef]

346. Ohm, S.; Hinton, J.A.; White, R. γ-ray emission from the Westerlund 1 region. *Mon. Not. R. Astron. Soc.* **2013**, *434*, 2289–2294. [CrossRef]

347. Yang, R.; de Oña Wilhelmi, E.; Aharonian, F. Diffuse γ-ray emission in the vicinity of young star cluster Westerlund 2. *Astron. Astrophys.* **2018**, *611*, A77. [CrossRef]

348. Yang, R.; Wang, Y. The diffuse gamma-ray emission toward the Galactic mini starburst W43. *Astron. Astrophys.* **2020**, *640*, A60. [CrossRef]

349. Bartoli, B.; et al. [The ARGO-YBJ Collaboration] Identification of the TeV Gamma-Ray Source ARGO J2031+4157 with the Cygnus Cocoon. *Astrophys. J.* **2014**, *790*, 152. [CrossRef]

350. Abeysekara, A.U.; Albert, A.; Alfaro, R.; Alvarez, C.; Camacho, J.R.A.; Arteaga-Velázquez, J.C.; Arunbabu, K.P.; Rojas, D.A.; Solares, H.A.; Baghmanyan, V.; et al. HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon. *Nature Astronomy* **2021**. [CrossRef]

351. Abramowski, A.; et al. [The HESS Collaboration] Discovery of extended VHE γ-ray emission from the vicinity of the young massive stellar cluster Westerlund 1. *Astron. Astrophys.* **2012**, *537*, A114. [CrossRef]

352. Abramowski, A.; et al. [The H. E. S. S. Collaboration]. Revisiting the Westerlund 2 field with the HESS telescope array. *Astron. Astrophys.* **2011**, *525*, A46. [CrossRef]

353. Abramowski, A.; et al. [The H.E.S.S. Collaboration] Acceleration of petaelectronvolt protons in the Galactic Centre. *Nature* **2016**, *531*, 476–479. [CrossRef] [PubMed]

354. Abramowski, A.; et al. [The H.E.S.S. Collaboration] The exceptionally powerful TeV γ-ray emitters in the Large Magellanic Cloud. *Science* **2015**, *347*, 406–412. [CrossRef]

355. Melena, N.W.; Massey, P.; Morrell, N.I.; Zangari, A.M. The Massive Star Content of NGC 3603. *Astron. J.* **2008**, *135*, 878–891. [CrossRef]

356. Furukawa, N.; Dawson, J.R.; Ohama, A.; Kawamura, A.; Mizuno, N.; Onishi, T.; Fukui, Y. Molecular Clouds Toward RCW49 and Westerlund 2: Evidence for Cluster Formation Triggered by Cloud-Cloud Collision. *Astrophys. J. Lett.* **2009**, *696*, L115–L119. [CrossRef]
357. Vargas Álvarez, C.A.; Kobulnicky, H.A.; Bradley, D.R.; Kannappan, S.J.; Norris, M.A.; Cool, R.J.; Miller, B.P. The Distance to the Massive Galactic Cluster Westerlund 2 from a Spectroscopic and HST Photometric Study. *Astron. J.* **2013**, *145*, 125. [CrossRef]

358. Nguyen Luong, Q.; Motte, F.; Schuller, F.; Schneider, N.; Bontemps, S.; Schilke, P.; Menten, K.M.; Heitsch, F.; Wyrowski, F.; Carlhoff, P.; et al. W43: The closest molecular complex of the Galactic bar? *Astron. Astrophys.* **2011**, *529*, A41. [CrossRef]

359. Ballet, J.; Burnett, T.H.; Digel, S.W.; Lott, B. Fermi Large Area Telescope Fourth Source Catalog Data Release 2. *arXiv* **2020**, arXiv:2005.11208.

360. Ackermann, M.; et al. [The Fermi-LAT Collaboration] The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope. *Astrophys. J. Suppl. Ser.* **2018**, *237*, 32. [CrossRef]

361. Liu, B.; Yang, R.; Sun, X.; Aharonian, F.; Chen, Y. The GeV Emission in the Field of the Star-forming Region W30 Revisited. *Astrophys. J.* **2019**, *881*, 94. [CrossRef]

362. Sun, X.-N.; Yang, R.-Z.; Liang, Y.-F.; Peng, F.-K.; Zhang, H.-M.; Wang, X.-Y.; Aharonian, F. Diffuse γ-ray emission toward the massive star-forming region, W40. *Astron. Astrophys.* **2020**, *639*, A80. [CrossRef]

363. Ergin, T.; Saha, L.; Bhattacharjee, P.; Sano, H.; Tanaka, S.J.; Majumdar, P.; Yamazaki, R.; Fukui, Y. Probing the star formation origin of gamma-rays from 3FHL J1907.0+0713. *Mon. Not. R. Astron. Soc.* **2021**, *501*, 4226–4237. [CrossRef]

364. Katsuta, J.; Uchiyama, Y.; Funk, S. Extended Gamma-Ray Emission from the G25.0+0.0 Region: A Star-forming Region Powered by the Newly Found OB Association? *Astrophys. J.* **2017**, *839*, 129. [CrossRef]

365. Aharonian, F.; Yang, R.; de Oña Wilhelmi, E. Massive stars as major factories of Galactic cosmic rays. *Nat. Astron.* **2019**, *3*, 561–567. [CrossRef]

366. Jouvin, L.; Lemière, A.; Terrier, R. Does the SN rate explain the very high energy cosmic rays in the central 200 pc of our Galaxy? *Mon. Not. R. Astron. Soc.* **2017**, *467*, 4622–4630. [CrossRef]

367. Jouvin, L.; Lemière, A.; Terrier, R. Time-dependent escape of cosmic rays from supernova remnants potentially at the origin of the very-high-energy cosmic-ray gradient of the Galactic center. *Astron. Astrophys.* **2020**, *644*, A113. [CrossRef]

368. Maurin, G.; Marcowith, A.; Komin, N.; Krayzel, F.; Lamanna, G. Embedded star clusters as sources of high-energy cosmic rays. Modelling and constraints. *Astron. Astrophys.* **2016**, *591*, A71. [CrossRef]

369. Ackermann, M.; et al. [The Fermi LAT Collaboration] An extremely bright gamma-ray pulsar in the Large Magellanic Cloud. *Science* **2015**, *350*, 801–805. [CrossRef]

370. Völk, H.J.; Aharonian, F.A.; Breitschwerdt, D. The Nonthermal Energy Content and Gamma-Ray Emission of Starburst Galaxies and Clusters of Galaxies. *Space Sci. Rev.* **1996**, *75*, 279–297. [CrossRef]

371. Torres, D.F.; Reimer, O.; Domingo-Santamaría, E.; Digel, S.W. Luminous Infrared Galaxies as Plausible Gamma-Ray Sources for the Gamma-Ray Large Area Space Telescope and the Imaging Atmospheric Cerenkov Telescopes. *Astrophys. J. Lett.* **2004**, *607*, L99–L102. [CrossRef]

372. Ajello, M.; Di Mauro, M.; Paliya, V.S.; Garrappa, S. The Gamma-ray Emission of Star-forming Galaxies. *Astrophys. J.* **2020**, *894*, 88. [CrossRef]

373. Yoast-Hull, T.M.; Gallagher, I.I.I.; Zweibel, J.S.E.G.; Everett, J.E. Active Galactic Nuclei, Neutrinos, and Interacting Cosmic Rays in NGC 253 and NGC 1068. *Astrophys. J.* **2014**, *780*, 137. [CrossRef]

374. Acero, F.; et al. [The H.E.S.S. Collaboration]. Detection of Gamma Rays from a Starburst Galaxy. *Science* **2009**, *326*, 1080. [CrossRef]

375. Abdalla, H.; et al. [The H.E.S.S. Collaboration] The starburst galaxy NGC 253 revisited by H.E.S.S. and Fermi-LAT. *Astron. Astrophys.* **2018**, *617*, A73. [CrossRef]

376. Abdo, A.A.; Ackermann, M.; Ajello, M.; Allafort, A.; Atwood, W.B.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; et al. Fermi Large Area Telescope observations of Local Group galaxies: Detection of M 31 and search for M 33. *Astron. Astrophys.* **2010**, *523*, L2. [CrossRef]

377. Lacki, B.C.; Thompson, T.A.; Quataert, E. The Physics of the Far-infrared-Radio Correlation. I. Calorimetry, Conspiracy, and Implications. *Astrophys. J.* **2010**, *717*, 1–28. [CrossRef]

378. Martin, P. Interstellar gamma-ray emission from cosmic rays in star-forming galaxies. *Astron. Astrophys.* **2014**, *564*, A61. [CrossRef]

379. Strong, A.W.; Porter, T.A.; Digel, S.W.; Jóhannesson, G.; Martin, P.; Moskalenko, I.V.; Murphy, E.J.; Orlando, E. Global Cosmic-ray-related Luminosity and Energy Budget of the Milky Way. *Astrophys. J. Lett.* **2010**, *722*, L58–L63. [CrossRef]

380. Krumholz, M.R.; Crocker, R.M.; Xu, S.; Lazarian, A.; Rosevear, M.T.; Bedwell-Wilson, J. Cosmic ray transport in starburst galaxies. *Mon. Not. R. Astron. Soc.* **2020**, *493*, 2817–2833. [CrossRef]

381. Heesen, V.; Beck, R.; Krause, M.; Dettmar, R.J. Cosmic rays and the magnetic field in the nearby starburst galaxy NGC 253. I. The distribution and transport of cosmic rays. *Astron. Astrophys.* **2009**, *494*, 563–577. [CrossRef]

382. Ackermann, M.; Ajello, M.; Albert, A.; Atwood, W.B.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; et al. Resolving the Extragalactic Gamma-Ray Background above 50 GeV with the Fermi Large Area Telescope. *Phys. Rev. Lett.* **2016**, *116*, 151105. [CrossRef] [PubMed]

383. Bechtol, K.; Ahlers, M.; de Mauro, M.; Ajello, M.; Vandenbroucke, J. Evidence against Star-forming Galaxies as the Dominant Source of Icecube Neutrinos. *Astrophys. J.* **2017**, *836*, 47. [CrossRef]

384. Sudoh, T.; Totani, T.; Kawanaka, N. High-energy gamma-ray and neutrino production in star-forming galaxies across cosmic time: Difficulties in explaining the IceCube data. *Publ. Astron. Soc. Jpn.* **2018**, *70*, 49. [CrossRef]
385. Aartsen, M.G.; et al. [The IceCube Collaboration] A Combined Maximum-likelihood Analysis of the High-energy Astrophysical Neutrino Flux Measured with IceCube. Astrophys. J. 2015, 809, 98. [CrossRef]

386. Ambrosone, A.; Chianese, M.; Fiorillo, D.F.G.; Marinelli, A.; Miele, G.; Pisanti, O. Starburst galaxies strike back: A multi-messenger analysis with Fermi-LAT and IceCube data. Mon. Not. R. Astron. Soc. 2021, 503, 4032–4049. [CrossRef]

387. Peretti, E.; Blasi, P.; Aharonian, F.; Morlino, G. Cosmic ray transport and radiative processes in nuclei of starburst galaxies. Mon. Not. R. Astron. Soc. 2019, 487, 168–180. [CrossRef]

388. Yoast-Hull, T.M.; Gallagher, J.S.; Zweibel, E.G. Cosmic rays, gamma-rays, and neutrinos in the starburst nuclei of Arp 220. Mon. Not. R. Astron. Soc. 2015, 453, 222–228. [CrossRef]

389. Lacki, B.C.; Thompson, T.A. Diffuse Hard X-Ray Emission in Starburst Galaxies as Synchrotron from Very High Energy Electrons. Astrophys. J. 2013, 762, 29. [CrossRef]

390. Wik, D.R.; Lehmer, B.D.; Hornschemeier, A.E.; Yukita, M.; Ptak, A.; Zezas, A.; Antoniou, V.; Argo, M.K.; Bechtol, K.; Boggs, S.; et al. Spatially Resolving a Starburst Galaxy at Hard X-ray Energies: NuSTAR, Chandra, AND VLBA Observations of NGC 253. arXiv 2014, arXiv:astro-ph.HE/1411.1089.

391. Yoast-Hull, T.M.; Everett, J.E.; Gallagher, I.I.I.; S, J.; Zweibel, E.G. Winds, Clumps, and Interacting Cosmic Rays in M82. Astrophys. J. 2013, 768, 53. [CrossRef]

392. Kornecki, P.; Pellizza, L.J.; del Palacio, S.; Müller, A.L.; Albacete-Colombo, J.F.; Romero, G.E. γ-ray/infrared luminosity correlation of star-forming galaxies. Astron. Astrophys. 2020, 641, A147. [CrossRef]

393. Pfrommer, C.; Pakmor, R.; Simpson, C.M.; Springel, V. Simulating Gamma-Ray Emission in Star-forming Galaxies. Astrophys. J. Lett. 2017, 847, L13. [CrossRef]

394. Robitaille, T.; Bressert, E. APLpy: Astronomical Plotting Library in Python. 2012. Available online: http://aplpy.github.io/ (accessed on 10 May 2021).

395. Robitaille, T.P.; et al. [Astropy Collaboration] Astropy: A community Python package for astronomy. Astron. Astrophys. 2013, 558, A33. [CrossRef]

396. Hunter, J.D. Matplotlib: A 2D Graphics Environment. Comput. Sci. Eng. 2007, 9, 90–95. [CrossRef]

397. van der Walt, S.; Colbert, S.C.; Varoquaux, G. The NumPy Array: A Structure for Efficient Numerical Computation. Comput. Sci. Eng. 2011, 13, 22–30. [CrossRef]

398. Virtanen, P.; Gommers, R.; Oliphant, T.E.; Haberland, M.; Reddy, T.; Cournapeau, D.; Burovski, E.; Peterson, P.; Weckesser, W.; Bright, J.; et al. SciPy 1.0: Fundamental Algorithms for Scientific Computing in Python. Nat. Methods 2020, 17, 261–272. [CrossRef]