bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cosmic-Ray Anisotropy Study by Means of Detection of Muon Bundles
Authors: Amelchakov M. B. , Bogdanov A. G. , Chiavassa A. , Dmitrieva A. N. , Kompaniets K. G. , Khokhlov S. S. , Kokoulin R. P. , Mannocchi G. , Petrukhin A. A. , Shutenko V. V. , Shulzhenko I. A. , Trinchero G. , Yashin I. I. , Yurina E. A. 
Published: March 2023

Abstract
In this work, we use muon bundles, which are formed in extensive air showers and detected at the ground level, as a tool for searching for anisotropy in high-energy cosmic rays. Such choice is explained by the penetrating ability of muons that allows them to retain the direction of primary particles with good accuracy. In 2012–2022, we performed long-term muon-bundle detection with the coordinate-tracking detector DECOR, which is a part of the Experimental Complex NEVOD (MEPhI, Moscow). To search for cosmic-ray anisotropy, muon bundles arriving at zenith angles in the range from 15° to 75° in the local coordinate system are used. During the entire period of data taking, about 14 million of such events have been accumulated. In this paper, we describe some methods developed in the Experimental Complex NEVOD and implemented in our research, including: the method for compensating for the influence of meteorological conditions on the intensity of muon bundles at the Earth’s surface, the method for accounting for the design features of the detector and the inhomogeneity of the detection efficiency for different directions, as well as the method for estimating the primary energies of cosmic rays. Here we present the results of the search for the dipole anisotropy of cosmic rays with energies in the PeV region and also compare them with the results obtained at other scientific facilities.
Evidence for the Operation of the Hanle and Magneto-optical Effects in the Scattering Polarization Signals Observed by CLASP2 across the Mg ii h and k Lines
Authors: Ishikawa Ryohko , Trujillo Bueno Javier , Alsina Ballester Ernest , Belluzzi Luca , del Pino Alemán Tanausú , McKenzie David E. , Auchère Frédéric , Kobayashi Ken , Okamoto Takenori J. , Rachmeler Laurel A. , Song Donguk 
Published: March 2023

Abstract
Radiative transfer investigations of the solar Mg ii h and k resonance lines around 280 nm have shown that, while their circular polarization (Stokes V) signals arise from the Zeeman effect, the linear polarization profiles (Stokes Q and U) are dominated by the scattering of anisotropic radiation and the Hanle and magneto-optical (MO) effects. Using the unprecedented observations of the Mg ii and Mn i resonance lines obtained by the Chromospheric LAyer Spectro-Polarimeter (CLASP2), here we investigate how the linear polarization signals at different wavelengths (i.e., at the center, and at the near and far wings of the k line) vary with the longitudinal component of the magnetic field (B

L
) at their approximate height of formation. The B

L
is estimated from the V signals in the aforementioned spectral lines. Particular attention is given to the following quantities that are expected to be influenced by the presence of magnetic fields through the Hanle and MO effects: the sign of the U signals, the total linear polarization amplitude (LP) and its direction (χ) with respect to a reference direction. We find that at the center and near wings of the k line, the behavior of these quantities is significantly different in the observed quiet and plage regions, and that both LP and χ seem to depend on B

L
. These observational results are indicative of the operation of the Hanle effect at the center of the k line and of the MO effects at the near wings of the k line.
[O iii] 5007 Å Emission Line Width as a Surrogate for σ
∗ in Type 1 AGNs?
Authors: Le 黎阮黄英 Huynh Anh N. , Xue 薛永泉 Yongquan , Lin 林晓鸷 Xiaozhi , Wang 王倚君 Yijun 
Published: March 2023

Abstract
We present a study of the relation between the [O iii] 5007 Å emission line width (σ
[OIII]) and stellar velocity dispersion (σ
*), utilizing a sample of 740 type 1 active galactic nuclei (AGNs) with high-quality spectra at redshift z < 1.0. We find the broad correlation between the core component of the [O iii] emission line width (

σ

[
O
III
,
core
]

) and σ
* with a scatter of 0.11 dex for the low redshift (z < 0.1) sample; for redshift (0.3 < z < 1.0) AGNs, the scatter is larger, being 0.16 dex. We also find that the Eddington ratio (L
bol/L
Edd) may play an important role in the discrepancies between

σ

[
O
III
,
core
]

and σ
*. As the L
bol/L
Edd increases,

σ

[
O
III
,
core
]

tends to be larger than σ
*. By classifying our local sample with different minor-to-major axis ratios, we find that σ
* is larger than

σ

[
O
III
,
core
]

for those edge-on spiral galaxies. In addition, we also find that the effects of outflow strength properties such as maximum outflow velocity (

V

max

) and the broader component of the [O iii] emission line width and line shift (σ
[OIII,out] and V
[OIII,out]) may play a major role in the discrepancies between

σ

[
O
III
,
core
]

and σ
*. The discrepancies between

σ

[
O
III
,
core
]

and σ
* are larger when

V

max

, V
[OIII,out], and σ
[OIII,out] increase. Our results show that the outflow strengths may have significant effects on the differences between narrow-line region gas and stellar kinematics in AGNs. We suggest that caution should be taken when using

σ

[
O
III
,
core
]

as a surrogate for σ
*. In addition, the substitute of

σ

[
O
III
,
core
]

for σ
* could be used only for low luminosity AGNs.
VLA Legacy Survey of Molecular Gas in Massive Star-forming Galaxies at High Redshift
Authors: Castillo Marta Frias , Hodge Jacqueline , Rybak Matus , van der Werf Paul , Smail Ian , Birkin Jack E. , Chen Chian-Chou , Chapman Scott C. , Hill Ryley , del P.Lagos Claudia , Liao Cheng-Lin , da Cunha Elisabete , Rivera Gabriela Calistro , Chen Jianhang , Jiménez-Andrade E. F. , Murphy Eric J. , Scott Douglas , Swinbank A. M. , Walter Fabian , Ivison R. J. , Dannerbauer Helmut 
Published: March 2023

Abstract
We present the initial results of an ongoing survey with the Karl G. Jansky Very Large Array targeting the CO(J = 1–0) transition in a sample of 30 submillimeter-selected, dusty star-forming galaxies (SFGs) at z = 2–5 with existing mid-J CO detections from the Atacama Large Millimeter/submillimeter Array and NOrthern Extended Millimeter Array, of which 17 have been fully observed. We detect CO(1–0) emission in 11 targets, along with three tentative (∼1.5σ–2σ) detections; three galaxies are undetected. Our results yield total molecular gas masses of 6–23 × 1010 (α
CO/1) M
⊙, with gas mass fractions, f
gas = M
mol/(M
*+M
mol), of 0.1–0.8 and a median depletion time of (140 ± 70) Myr. We find median CO excitation ratios of r
31 = 0.75 ± 0.39 and r
41 = 0.63 ± 0.44, with significant scatter. We find no significant correlation between the excitation ratio and a number of key parameters such as redshift, CO(1–0) line width, or ΣSFR. We only find a tentative positive correlation between r
41 and the star-forming efficiency, but we are limited by our small sample size. Finally, we compare our results to predictions from the SHARK semi-analytical model, finding a good agreement between the molecular gas masses, depletion times, and gas fractions of our sources and their SHARK counterparts. Our results highlight the heterogeneous nature of the most massive SFGs at high redshift, and the importance of CO(1–0) observations to robustly constrain their total molecular gas content and interstellar medium properties.
Spatially Resolved Stellar Populations of 0.3 < z < 6.0 Galaxies in WHL 0137–08 and MACS 0647+70 Clusters as Revealed by JWST: How Do Galaxies Grow and Quench over Cosmic Time?
Authors: Abdurro’uf  , Coe Dan , Jung Intae , Ferguson Henry C. , Brammer Gabriel , Iyer Kartheik G. , Bradley Larry D. , Dayal Pratika , Windhorst Rogier A. , Zitrin Adi , Meena Ashish Kumar , Oguri Masamune , Diego Jose M. , Kokorev Vasily , Dimauro Paola , Adamo Angela , Conselice Christopher J. , Welch Brian , Vanzella Eros , Hsiao Tiger Yu-Yang , Xu Xinfeng , Roy Namrata , Mulcahey Celia R. 
Published: March 2023

Abstract
We study the spatially resolved stellar populations of 444 galaxies at 0.3 < z < 6.0 in two clusters (WHL 0137–08 and MACS 0647+70) and a blank field, combining imaging data from the Hubble Space Telescope and JWST to perform spatially resolved spectral energy distribution (SED) modeling using piXedfit. The high spatial resolution of the imaging data combined with magnification from gravitational lensing in the cluster fields allows us to resolve a large fraction of our galaxies (109) to subkiloparsec scales. At redshifts around cosmic noon and higher (2.5 ≲ z ≲ 6.0), we find mass-doubling times to be independent of radius, inferred from flat specific star formation rate (sSFR) radial profiles and similarities between the half-mass and half-SFR radii. At lower redshifts (1.5 ≲ z ≲ 2.5), a significant fraction of our star-forming galaxies shows evidence for nuclear starbursts, inferred from a centrally elevated sSFR and a much smaller half-SFR radius compared to the half-mass radius. At later epochs, we find more galaxies suppress star formation in their centers but are still actively forming stars in the disk. Overall, these trends point toward a picture of inside-out galaxy growth consistent with theoretical models and simulations. We also observe a tight relationship between the central mass surface density and global stellar mass with ∼0.38 dex scatter. Our analysis demonstrates the potential of spatially resolved SED analysis with JWST data. Future analysis with larger samples will be able to further explore the assembly of galaxy mass and the growth of their structures.
Tracking Nonradial Outflows in Extreme Ultraviolet and White Light Solar Images
Authors: Alzate Nathalia , Morgan Huw , Di Matteo Simone 
Published: March 2023

Abstract
Understanding the solar corona requires knowledge of its dynamics through its various layers and subsequent connectivity to the heliosphere. This requires understanding the nature of the outflows and the physical transitions through the middle corona (∼1.5–6.0 R

s
). While this region is still inaccessible to in situ measurements, remote sensing observations are available, but their interpretation can be controversial due to line-of-sight effects and the nonradial motion of outflowing structures close to the Sun (≤3.0 R

s
). In this work, we describe a method to mitigate these challenges by generating nonradial height–time profiles of outflows by using advanced image processing techniques. The northern and southern boundaries of a large equatorial streamer during the 2008 solar minimum were identified in STEREO/SECCHI solar images, using two different methodologies based on thresholds of brightness and piecewise polynomial function fitting. To address line-of-sight issues, we used tomographic reconstruction of the 3D distribution of the coronal electron density based on SECCHI/COR2 images. Spectral analysis of the time series of the position angle of the streamer boundary revealed its oscillatory nature at some heights at 36–48 and 10.5–14.6 hr. Dividing the distance between the northern and southern streamer boundaries in equal parts at each height, we obtained nonradial height–time paths from which we generated nonradial profiles of corona/solar wind plasma outflow. We tracked outflows as they moved uninterruptedly from the Sun in EUVI, through COR1 and into COR2. Finally, we discuss the preliminary results of nonradial plane-of-sky velocities for a coronal mass ejection and two small-scale features.
Resolving the Bow Shock and Tail of the Cannonball Pulsar PSR J0002+6216
Authors: Kumar P. , Schinzel F. K. , Taylor G. B. , Kerr M. , Castro D. , Rau U. , Bhatnagar S. 
Published: March 2023

Abstract
We present X-ray and radio observations of the recently discovered bow-shock pulsar wind nebula (PWN) associated with PSR J0002+6216, characterizing the PWN morphology, which was unresolved in previous studies. The multifrequency, multiepoch Very Large Array (VLA) radio observations reveal a cometary tail trailing the pulsar and extending up to 5.′3, with multiple kinks along the emission. The presented radio continuum images from multiconfiguration broadband VLA observations are one of the first results from the application of multiterm multifrequency synthesis deconvolution in combination with the AWProject gridder implemented in the Common Astronomy Software Applications (CASA) package. The X-ray emission observed with Chandra extends to only 21″, fades quickly, and has some hot spots present along the extended radio emission. These kinks could indicate the presence of density variations in the local interstellar medium or turbulence. The bow-shock standoff distance estimates a small bow-shock region with a size of 0.003–0.009 pc, consistent with the pulsar spin-down power of

E

̇

= 1.51 × 1035 erg s−1 estimated from timing. The high-resolution radio image reveals the presence of an asymmetry in the bow-shock region, which is also present in the X-ray image. The broadband radio image shows an unusually steep spectrum along with a flat-spectrum sheath, which could indicate varying opacity or energy injection into the region. Spatially resolved X-ray spectra provide marginal evidence of synchrotron cooling along the extended tail. Our analysis of the X-ray data also shows that this pulsar has a low spin-down power and one of the lowest X-ray efficiencies observed in these objects.
The Apparent Absence of Forward Scattering in the HD 53143 Debris Disk
Authors: Stark Christopher C. , Ren Bin , MacGregor Meredith A. , Howard Ward S. , Hurt Spencer A. , Weinberger Alycia J. , Schneider Glenn , Choquet Elodie 
Published: March 2023

Abstract
HD 53143 is a mature Sun-like star and host to a broad disk of dusty debris, including a cold outer ring of planetesimals near 90 au. Unlike most other inclined debris disks imaged at visible wavelengths, the cold disk around HD 53143 appears as disconnected “arcs” of material, with no forward-scattering side detected to date. We present new, deeper Hubble Space Telescope Imaging Spectrograph coronagraphic observations of the HD 53143 debris disk and show that the forward-scattering side of the disk remains undetected. By fitting our KLIP-reduced observations via forward modeling with an optically thin disk model, we show that fitting the visible wavelength images with an azimuthally symmetric disk with unconstrained orientation results in an unphysical edge-on orientation that is at odds with recent ALMA observations, while constraining the orientation to that observed by ALMA results in nearly isotropically scattering dust. We show that the HD 53143 host star exhibits significant stellar variations due to spot rotation and revisit age estimates for this system.
Accretion-induced Collapse of Dark Matter-admixed Rotating White Dwarfs: Dynamics and Gravitational-wave Signals
Authors: Chan Ho-Sang , Chu Ming-chung , Leung Shing-Chi 
Published: March 2023

Abstract
We present two-dimensional hydrodynamic simulations of the accretion-induced collapse (AIC) of rotating white dwarfs admixed with an extended component of dark matter (DM) comprising sub-gigaelectronvolt degenerate fermionic DM particles. We find that the DM component follows the collapse of the normal matter (NM) component to become a bound DM core. Thus, we demonstrate how a DM-admixed neutron star could form through DM-admixed AIC (DMAIC) for the first time, with the dynamics of DM taken into account. The gravitational-wave (GW) signature from the DMAIC shows distinctive features. In the diffusive DM limit, the DM admixture indirectly suppresses the post-bounce spectral peak of the NM GWs. In the compact DM limit, the collapse dynamics of the DM in a Milky Way event generate GWs that are strong enough to be detectable by Advanced LIGO as continuous low-frequency (<1000 Hz) signals after the NM core bounce. Our study not only is the first-ever computation of GW from a collapsing DM object but also provides the key features to identify DM in AIC events through future GW detections.
First Ejection from the PSR B1259-63/LS 2883 High Mass Gamma-Ray Binary Detected During the 2021–2024 Binary Cycle
Authors: Hare Jeremy , Pavlov George G. , Kargaltsev Oleg , Garmire Gordon P. 
Published: March 2023

Abstract
LS 2883/PSR B1259-63 is a high mass, eccentric gamma-ray binary that has previously been observed to eject X-ray emitting material. We report the results of recent Chandra observations near binary apastron in which a new X-ray emitting clump of matter was detected. The clump has a high projected velocity of v
⊥ ≈ 0.07c and hard X-ray spectrum, which fits an absorbed power-law model with Γ = 1.1 ± 0.3. Although clumps with similar velocities and spectra were detected in some of the previous binary cycles, no resolved clumps were seen near apastron in the preceding cycle of 2017–2021.
Enfants et écrans durant les six premières années de la vie à travers le suivi de la cohorte Elfe
Authors: Diter Kevin , Octobre Sylvie 
Published: March 2023

Le rapport des enfants aux écrans suscite autant de suspicions que de conseils éducatifs, insistant dans les deux cas sur les risques d’addictions, de développements de pathologies ou de comportements déviants. Aux paniques morales anciennes sur la télévision s’ajoutent désormais celles qui portent sur le numérique. Le présent travail prolonge de quatre ans l’analyse des temps passés devant les écrans par des enfants en bas âge (de la naissance à l’âge de 2 ans) à partir de la cohorte de naissance de l’étude longitudinale française (Elfe). Constituée d’un panel de 18 000 enfants nés en 2011, elle décrit, à l’échelle nationale, l’équipement des foyers et la fréquence d’exposition des enfants aux différents écrans. À 5 ans et demi, les écrans sont présents dans le quotidien de tous les enfants et la consommation d’écran unique (celui de la télévision) diminue au profit d’un monde multi-écrans, dans lequel la télévision demeure centrale. Les rapports des enfants à la télévision et aux écrans numériques (ordinateur, tablette, smartphone) se distinguent toutefois nettement durant les six premières années de la vie, ce qui témoigne d’une appropriation différente des normes éducatives selon les milieux sociaux, les configurations familiales, les pratiques éducatives ou les rapports aux écrans des parents eux-mêmes.
Ear Recognition Using Rank Level Fusion of Classifiers Outputs
Authors: Resmi K. R.  , Joseph Shijo M. , Raju G.  , Swain Debabrata , Das Om Prakash , Acharya Biswaranjan 
Published: March 2023

An individual's authentication plays a vital role in our daily life. In the last decade, biometric-based authentication has become more prevalent than traditional approaches like passwords and pins. Ear recognition has gained attention in the biometric community in recent years. Researchers defined several features for the identification of a person from ear image. The features play a vital role in the success of classification models. This paper considers an ensemble of features for designing a new classification model. The features are assessed in isolation as well as through feature-level fusion. Subsequently, a rank-level fusion for classification is introduced. The experiments are conducted on both constrained and unconstrained ear datasets. The results are promising and open up new possibilities in machine learning-based ear recognition
Investigating the Association of IL12B and INFG Polymorphisms with the Risk of Pseudoexfoliation Syndrome and Glaucoma
Authors: Fakhraie Ghasem , Ghanavi Jalaledin , Saliminejad Kioomars , Farnia Poopak 
Published: March 2023

Background:
Immune responses may be involved in the development of pseudoexfoliation (PEX), pseudoexfoliation glaucoma (PEXG), and primary open-angle glaucoma (POAG) pathogenesis. The aim of the present study was to evaluate the association of IL12B rs3212227 A/C and INFG rs1861494 T/C polymorphisms with the risk of PEX, PEXG, and POAG in an Iranian population.

Methods:
Totally, 55 POAG, 57 PEX, and 78 PEXG patient cases as well as 79 healthy controls were included in this study. Genotyping of the IL12B and INFG polymorphisms was performed by polymerase chain reaction and restriction fragment length polymorphism methods using TaqI and FauI restriction enzyme, respectively.

Results:
Results indicated that IL12B AC genotype was significantly higher in POAG (36.4%; P < 0.001; odds ratio [OR] = 4.0, 95% confidence interval [CI]: 1.7–10.0) and PEX patients (36.4%; P = 0.023; OR = 2.7, 95% CI: 1.1–6.9) compared to the control group (12.6%). The C allele could be considered a risk factor for POAG (P = 0.002; OR = 3.1, 95% CI: 3.1–6.8) and PEX (P < 0.001; OR = 3.4, 95% CI: 3.4–7.3). INFG TC genotype was significantly higher in PEX (38.6%; P = 0.007; OR = 2.8, 95% CI: 1.3–6.3) and PEXG patients (37.2%; P = 0.009; OR = 2.7, 95% CI: 1.1–6.9) compared to the control group (19.0%). The C allele seemed to be a risk factor for PEX (P = 0.002; OR = 2.8, 95% CI: 1.4–5.7) and PEXG (P = 0.009; OR = 2.4, 95% CI: 1.2–4.7).

Conclusion:
Overall, IL12B was associated with susceptibility to POAG and PEX, and IL12B C allele increased the risk of POAG and PEX. In addition, INFG was associated with susceptibility to PEX and PEXG, and the INFG C allele seemed to be a risk factor for PEX and PEXG.
Modulation of Platelet Functions by European Toad (Bufo Bufo) Skin Secretions Components
Authors: Udovychenko Iryna , Halenova Tetiana , Artemenko Oleksandr , Vovk Tetiana , Raksha Nataliia , Olexii Savchuk , Ostapchenko Liudmyla 
Published: March 2023

Background:
A growing number of reports indicate that amphibian skin secretions may have a remarkable medical importance; however, the effects of the components of some dermal secretions on blood platelets and hemostasis are inadequately recognized. Since our previous studies demonstrated that the general Bufo bufo skin secretions induced platelet aggregation in platelet-rich plasma, this work was designed to study the effects of the components of some fractions on platelet functions to comprehend its possible mechanism of action as platelet modulators.

Methods:
Chromatographic separation of B.
bufo general skin secretions was carried out using size exclusion chromatography. Rabbit platelets were purified by column chromatography on Sepharose 4B. Various aspects of platelet function such as activation, aggregation, and adhesion were evaluated.

Results:
One fraction, out of 7, dose-dependently induced aggregation of isolated platelets and was used in further experiments. The studied fraction was shown to induce platelet adhesion onto fibrinogen-coated surface. Furthermore, the results demonstrated the effects of the fraction on some processes that involved in platelets activation: The fraction components facilitated (Ca2+)i mobilization and attenuated platelets Akt phosphorylation, but had no effect on platelet serotonin secretion. Membrane integrity was determined using lactate dehydrogenase (LDH) assay. No increased LDH release was recorded that means no platelet damage, which could lead to misinterpretation of the data, occurred.

Conclusion:
The results suggest that components of the B. bufo skin secretions may be a promising source of natural compounds which can modulate platelet functions.