cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Biosignature Line Ratios of [P II] in Exoplanetary and Nebular Environments
Creators: name: Hoy, Kevin
name: Nahar, Sultana N.
name: Pradhan, Anil K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Being the backbone element of DNA, phosphorus is a key component in the search for life in the Universe. To aid in its detection, we present line emissivity ratios for the five lowest-lying forbidden [P~II] transitions, namely those among the levels $3s^23p^2(^3P_0,^3P_1, ^3P_2,^1D_2,^1S_0)$. The wavelengths range between 0.44-70 \mum, and several lie within the spectroscopic domain observable with the James Webb Space Telescope (JWST). These line ratios have been calculated using a new collisional-radiative-recombination (CRR) model combining calculated collision strengths and level-specific recombination rate coefficients; with both datasets computed using the accurate Breit-Pauli R-Matrix method. The CRR model includes a new scheme for \eion recombination to emission line formation. We compare its effect to models incorporating only electron impact excitation and spontaneous radiative decay. We find that electron-ion recombination has a significant impact on all line ratios, and represents a major improvement in physical accuracy of emission line models.
description: 5 pages, 4 figures
Astronomical Detection of the Interstellar Anion C10H- towards TMC-1 from the GOTHAM Large Program on the GBT
Creators: name: Remijan, Anthony
name: Scolati, Haley N.
name: Burkhardt, Andrew M.
name: Changala, P. Bryan
name: Charnley, Steven B.
name: Cooke, Ilsa R.
name: Cordiner, Martin A.
name: Gupta, Harshal
name: Herbst, Eric
name: Lee, Kin Long Kelvin
name: Loomis, Ryan
name: Shingledecker, Christopher N.
name: Siebert, Mark A.
name: Xue, Ci
name: McCarthy, Michael C.
name: McGuire, Brett A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences
subject: A.1
subject: 85-11

description: Using data from the GOTHAM (GBT Observations of TMC-1: Hunting for Aromatic Molecules) survey, we report the first astronomical detection of the C10H- anion. The astronomical observations also provided the necessary data to refine the spectroscopic parameters of C10H-. From the velocity stacked data and the matched filter response, C10H- is detected at >9σ confidence level at a column density of 4.04e11 cm-2. A dedicated search for the C10H radical was also conducted towards TMC-1. In this case, the stacked molecular emission of C10H was detected at a ~3.2σ confidence interval at a column density of 2.02e11 cm-2. However, since the determined confidence level is currently <5σ, we consider the identification of C10H as tentative. The full GOTHAM dataset was also used to better characterize the physical parameters including column density, excitation temperature, linewidth, and source size for the C4H, C6H and C8H radicals and their respective anions, and the measured column densities were compared to the predictions from a gas/grain chemical formation model and from a machine learning analysis. Given the measured values, the C10H-/C10H column density ratio is ~2.0 - the highest value measured between an anion and neutral species to date. Such a high ratio is at odds with current theories for interstellar anion chemistry. For the radical species, both models can reproduce the measured abundances found from the survey; however, the machine learning analysis matches the detected anion abundances much better than the gas/grain chemical model, suggesting that the current understanding of the formation chemistry of molecular anions is still highly uncertain.
description: 38 Pages, 24 Figures, 12 Tables, 8 Appendices
Fossil Groups Origins III. Characterization of the sample and observational properties of fossil systems
Creators: name: Zarattini, S.
name: Barrena, R.
name: Girardi, M.
name: Castro-Rodriguez, N.
name: Boschin, W.
name: Aguerri, J. A. L.
name: Méndez-Abreu, J.
name: Sánchez-Janssen, R.
name: Catalán-Torrecilla, C.
name: Corsini, E. M.
name: del Burgo, C.
name: D'Onghia, E.
name: Herrera-Ruiz, N.
name: Iglesias-Páramo, J.
name: Bailon, E. Jimenez
name: Muñoz, M. Lozada
name: Napolitano, N.
name: Vilchez, J. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: (Abridged) Fossil systems are group- or cluster-sized objects whose luminosity is dominated by a very massive central galaxy. In the current cold dark matter scenario, these objects formed hierarchically at an early epoch of the Universe and then slowly evolved until present day. That is the reason why they are called {\it fossils}. We started an extensive observational program to characterize a sample of 34 fossil group candidates spanning a broad range of physical properties. Deep $r-$band images were taken for each candidate and optical spectroscopic observations were obtained for $\sim$ 1200 galaxies. This new dataset was completed with SDSS DR7 archival data to obtain robust cluster membership and global properties of each fossil group candidate. For each system, we recomputed the magnitude gaps between the two brightest galaxies ($Δm_{12}$) and the first and fourth ranked galaxies ($Δm_{14}$) within 0.5 $R_{\rm 200}$. We consider fossil systems those with $Δm_{12} \ge 2$ mag or $Δm_{14} \ge 2.5$ mag within the errors. We find that 15 candidates turned out to be fossil systems. Their observational properties agree with those of non-fossil systems. Both follow the same correlations, but fossils are always extreme cases. In particular, they host the brightest central galaxies and the fraction of total galaxy light enclosed in the central galaxy is larger in fossil than in non-fossil systems. Finally, we confirm the existence of genuine fossil clusters. Combining our results with others in the literature, we favor the merging scenario in which fossil systems formed due to mergers of $L^\ast$ galaxies. The large magnitude gap is a consequence of the extreme merger ratio within fossil systems and therefore it is an evolutionary effect. Moreover, we suggest that at least one candidate in our sample could represent a transitional fossil stage.
description: 14 pages, 11 figures, accepted for publication in A&A
A disk-wind driving the rotating molecular outflow in CB 26
Creators: name: López-Vázquez, J. A.
name: Zapata, Luis A.
name: Lee, Chin-Fei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present 12CO (J=2-1) sensitive molecular line and 1.3 mm continuum observations made with the Submillimeter Array (SMA) of the bipolar outflow associated with the young star located in the Bok globule known as CB 26. The SMA observations were carried out in its extended configuration allowing us to study the kinematics and structure of the outflow with about 1 arcsec or 140 au resolution. We find that the dusty and edge-on circumstellar disk related with the outflow has an projected spatial (deconvolved) size of 196 au x 42 au with a total (gas and dust) mass of 0.031 Msun. We estimated a dynamical mass for the central object of 0.66 Msun, and the mass of the molecular outflow of 5x10-5 Msun. The observations confirm that the outflow rotation has a similar orientation to that of the edge-on disk. For the outflow, we find that the following quantities: the rotation velocity, the specific angular momentum, and the launching radius, decrease with the height above mid-plane, as observed in other molecular rotating outflows. The radius, and expansion velocity also increase with the height above the disk midplane. Estimations for the outflow linear momentum rate, the outflow angular momentum rate, and the accretion luminosity seem to be well explained by a disk wind present in CB26.
description: 9 pages, 8 figures
Dissipative preparation of generalised Bell states
Creators: name: Sweke, R.
name: Sinayskiy, I.
name: Petruccione, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A scheme is presented for the dissipative preparation of generalised Bell states of two-qubits, within the context of cavity QED. In the suggested protocol the dissipative processes of spontaneous emission and cavity loss are no longer undesirable, but essential to the required dynamics. Extremely long lived target states are achieved, with fidelities of near unity, utilising cooperativities corresponding to currently available optical cavities. Furthermore, the suggested protocol exhibits excellent scaling of relevant characteristics, with respect to cooperativity, such that improved results may be obtained as the development of experimental capabilities continues.
description: 22 pages, 7 figures
Gaia-ESO Survey: massive stars in the Carina Nebula. A new census of OB stars
Creators: name: Berlanas, S. R.
name: Apellániz, J. Maíz
name: Herrero, A.
name: Mahy, L.
name: Blomme, R.
name: Negueruela, I.
name: Dorda, R.
name: Comerón, F.
name: Gosset, E.
name: González, M. Pantaleoni
name: Lera, J. A. Molina
name: Sota, A.
name: Furst, T.
name: Alfaro, E. J.
name: Bergemann, M.
name: Carraro, G.
name: Drew, J. E.
name: Morbidelli, L.
name: Vink, J. S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Gaia-ESO survey sample of massive OB stars in the Carina Nebula consists of 234 stars. The addition of brighter sources from the Galactic O-Star Spectroscopic Survey and additional sources from the literature allows us to create the most complete census of massive OB stars done so far in the region. It contains a total of 316 stars, being 18 of them in the background and four in the foreground. Of the 294 stellar systems in Car OB1, 74 are of O type, 214 are of non-supergiant B type and 6 are of WR or non-O supergiant (II to Ia) spectral class. We identify 20 spectroscopic binary systems with an O-star primary, of which 6 are reported for the first time, and another 18 with a B-star primary, of which 13 are new detections. The average observed double-lined binary fraction of O-type stars in the surveyed region is 0.35, which represents a lower limit. We find a good correlation between the spectroscopic n-qualifier and the projected rotational velocity of the stars. The fraction of candidate runaways among the stars with and without the n-qualifier is 4.4% and 2.4%, respectively, although non resolved double-lined binaries can be contaminating the fast rotators sample.
description: Accepted for publication in A&A, 62 pages, 8 figures
General structure of quantum collisional models
Creators: name: Vacchini, Bassano
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We point to the connection between a recently introduced class of non-Markovian master equations and the general structure of quantum collisional models. The basic construction relies on three basic ingredients: a collection of time dependent completely positive maps, a completely positive trace preserving transformation and a waiting time distribution characterizing a renewal process. The relationship between this construction and a Lindblad dynamics is clarified by expressing the solution of a Lindblad master equation in terms of demixtures over different stochastic trajectories for the statistical operator weighted by suitable probabilities on the trajectory space.
description: 9 pages, 1 figure; proceedings of the conference IQIS 2013 to appear on IJQI
Repurposing of tibolone in alzheimer’s disease
Creators: name: BARRETO, GEORGE
Publisher: name: University of Limerick
Year: 2023
Subjects: classificationCode: 31
subject: Biological sciences
subject: FOS: Biological sciences

description: Alzheimer’s disease (AD) is a debilitating neurodegenerative disease characterised by the accumulation of amyloid-beta and tau in the brain, leading to the progressive loss of memory and cognition. The causes of its pathogenesis are still not fully understood, but some risk factors, such as age, genetics, and hormones, may play a crucial role. Studies show that postmenopausal women have a higher risk of developing AD, possibly due to the decrease in hormone levels, especially oestrogen, which may be directly related to a reduction in the activity of oestrogen receptors, especially beta (ERβ), which favours a more hostile cellular environment, leading to mitochondrial dysfunction, mainly affecting key processes related to transport, metabolism, and oxidative phosphorylation. Given the influence of hormones on biological processes at the mitochondrial level, hormone therapies are of clinical interest to reduce the risk or delay the onset of symptoms associated with AD. One drug with such potential is tibolone, which is used in clinics to treat menopause-related symptoms. It can reduce amyloid burden and have benefits on mitochondrial integrity and dynamics. Many of its protective effects are mediated through steroid receptors and may also be related to neuroglobin, whose elevated levels have been shown to protect against neurological diseases. Its importance has increased exponentially due to its implication in the pathogenesis of AD. In this review, we discuss recent advances in tibolone, focusing on its mitochondrial-protective effects, and highlight how valuable this compound could be as a therapeutic alternative to mitigate the molecular pathways characteristic of AD.
Effect of multiple scattering on the Transmission spectra and the Polarization phase curves for Earth-like Exoplanets
Creators: name: Singla, Manika
name: Chakrabarty, Aritra
name: Sengupta, Sujan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: It is the most appropriate time to characterize the Earth-like exoplanets in order to detect biosignature beyond the Earth because such exoplanets will be the prime targets of big-budget missions like JWST, Roman Space Telescope, HabEx, LUVOIR, TMT, ELT, etc. We provide models for the transmission spectra of the Earth-like exoplanets by incorporating effects of multiple scattering. For this purpose we numerically solve the full multiple-scattering radiative transfer equations instead of using Beer-Bouguer-Lambert's law that doesn't include the diffuse radiation due to scattering. Our models demonstrate that the effect of this diffuse transmission radiation can be observationally significant, especially in the presence of clouds. We also calculate the reflection spectra and polarization phase curves of Earth-like exoplanets by considering both cloud-free and cloudy atmospheres. We solve the 3D vector radiative transfer equations numerically and calculate the phase curves of albedo and disk-integrated polarization by using appropriate scattering phase matrices and integrating the local Stokes vectors over the illuminated part of the disks along the line of sight. We present the effects of the globally averaged surface albedo on the reflection spectra and phase curves as the surface features of such planets are known to significantly dictate the nature of these observational quantities. Synergic observations of the spectra and phase curves will certainly prove to be useful in extracting more information and reducing the degeneracy among the estimated parameters of terrestrial exoplanets. Thus, our models will play a pivotal role in driving future observations.
description: Accepted for publication in The Astrophysical Journal, 12 pages, 6 figures
Understanding sexual attributions as a mechanism for associations between implicit sexual beliefs and relationship and sexual well-being: An experimental study
Creators: name: Maxwell, Jessica A
name: Fitzpatrick, Danielle
name: Raposo, Stephanie
name: SHaRe Lab
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Social Psychology
subject: Experimental Analysis of Behavior
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology
subject: attributions
subject: commitment
subject: couples
subject: experiment
subject: implicit sexual beliefs
subject: motivation
subject: relationship dissolution
subject: relationship satisfaction
subject: sexual desire
subject: sexual distress
subject: sexual satisfaction

description: This is a pre-registration for research that will assess sexual attributions as a mechanism for associations between implicit sexual beliefs (i.e., sexual growth and destiny beliefs) and relationship and sexual well-being. To view our preregistration for the study, please view the attached document.
The Herschel Fornax Cluster Survey II: FIR properties of optically-selected Fornax cluster galaxies
Creators: name: Fuller, C.
name: Davies, J. I.
name: Auld, R.
name: Smith, M. W. L.
name: Baes, M.
name: Bianchi, S.
name: Bocchio, M.
name: Boselli, A.
name: Clemens, M.
name: Davis, T. A.
name: De Looze, I.
name: Alighieri, S. di Serego
name: Grossi, M.
name: Hughes, T. M.
name: Viaene, S.
name: Serra, P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The $Herschel$ Fornax Cluster Survey (HeFoCS) is a deep, far-infrared (FIR) survey of the Fornax cluster. The survey is in 5 $Herschel$ bands (100 - 500 $μ$m) and covers an area of 16 deg$^2$ centred on NGC1399. This paper presents photometry, detection rates, dust masses and temperatures using an optically selected sample from the Fornax Cluster Catalogue (FCC). Our results are compared with those previously obtained using data from the $Herschel$ Virgo Cluster Survey (HeViCS). In Fornax, we detect 30 of the 237 (13%) optically selected galaxies in at least one $Herschel$ band. The global detection rates are significantly lower than Virgo, reflecting the morphological make up of each cluster - Fornax has a lower fraction of late-type galaxies. For galaxies detected in at least 3 bands we fit a modified blackbody with a $β= 2$ emissivity. Detected early-type galaxies (E/S0) have a mean dust mass, temperature, and dust-to-stars ratio of $\log_{10}(/\mathrm{M_{\odot}}) = 5.82 \pm 0.20$, $ = 20.82 \pm 1.77$K, and $\log_{10}(M_{dust}/M_{stars}) = -3.87 \pm 0.28$, respectively. Late-type galaxies (Sa to Sd) have a mean dust mass, temperature, and dust-to-stars ratio of $\log_{10}(/\mathrm{M_{\odot}}) = 6.54 \pm 0.19$, $ = 17.47 \pm 0.97$K, and $\log_{10}(M_{dust}/M_{stars}) = -2.93 \pm 0.09$, respectively. The different cluster environments seem to have had little effect on the FIR properties of the galaxies and so we conclude that any environment dependent evolution, has taken place before the cluster was assembled.
description: 21 pages and 14 figures
Supermembrane in D=5: component action
Creators: name: Bellucci, S.
name: Kozyrev, N.
name: Krivonos, S.
name: Yeranyan, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Based on the connection between partial breaking of global supersymmetry, coset approach, which realized the given pattern of supersymmetry breaking, and the Nambu-Goto actions for the extended objects, we have constructed on-shell component action for N=1, D=5 supermembrane and its dual cousins. We demonstrate that the proper choice of the components and the use of the covariant (with respect to broken supersymmetry) derivatives drastically simplify the action: it can be represented as a sum of four terms each having an explicit geometric meaning.
description: 14 pages, PACS: 11.30.Pb, 12.60.Jv
Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105
Creators: name: Stiele, H.
name: Yu, W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The well-known black hole X-ray binary GRS 1915+105 is a unique source in the sense that it cannot be classified within the standard picture of black hole binary states. In this work we study archival XMM-Newton observations taken between 2003 and 2004 of the \c{hi} variability class of GRS 1915+105, which corresponds to the hard state in the standard black hole X-ray binary state classification. The crucial point of our study is that by using XMM-Newton data we can access the variability below 3 keV, an energy range that is not covered with RXTE. We focus on the study of the power spectral shape in the soft and hard X-ray band, in light of our work done with Swift on MAXI J1659-152. In the hard band (above 2.5 keV) power density spectra consist of band-limited noise and quasi-periodic oscillations, corresponding to the power spectral shape seen in the hard or intermediate state, while in the soft band the averaged power density spectrum is consistent with a power-law noise, corresponding to the power spectral shape usually seen in the soft state. The coexisting of two different power spectral shapes in the soft and hard band, where the soft band power spectrum is dominated by a power-law noise, is consistent with MAXI J1659-152, and confirms the energy dependence of power spectral states. Our additional spectral analysis shows that the disc component does contribute to the soft band flux. These findings support that the observed black hole power spectral state depends on which spectral component we are looking at, which implies that power spectral analysis is probably a more sensitive method than spectral modeling to trace the emergence of the disc component in the hard or intermediate state.
description: 9 pages, 5 figures, submitted to MNRAS
MPEC 2023-U281 : 2023 UD10
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 UD10

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Carrier rate of nasal pathogens of workers in feeds and flour mill Ewu, Edo State
Creators: name: Ifeoma Enweani
Publisher: name: figshare
Year: 2020
Subjects: subject: 110303 Clinical Microbiology
subject: FOS: Clinical medicine
subject: Diseases
subject: 111706 Epidemiology
subject: FOS: Health sciences

description: Out of 100 persons working in Feeds and Flour Mill, whose nasal swabs were collected, 29 (29%) yielded some bacteria. Blood agar and chocolate agar were the media employed for culturing. The bacterial isolates included Staphylococcus aureus (20%), Streptococcus pneumoniae (4%), Haemophilus infleunzae (3%) and Neissseria meningtidis (2%). The most frequently isolated bacterium was S. aureus obtained mainly from the workers in the mill department. There were no isolates made from workers in transport and marketing departments. The age group between 26-30 and 31-35 had the nasal bacteria isolated from them. The antimicrobial susceptibility test indicated that there were difference in the sensitivity and resistant patterns of the isolates
A Unified Model for Bipolar Outflows from Young Stars: Apparent Magnetic Jet Acceleration
Creators: name: Shang, Hsien
name: Krasnopolsky, Ruben
name: Liu, Chun-Fan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We explore a new, efficient mechanism that can power toroidally magnetized jets up to two to three times their original terminal velocity after they enter a self-similar phase of magnetic acceleration. Underneath the elongated outflow lobe formed by a magnetized bubble, a wide-angle free wind, through the interplay with its ambient toroid, is compressed and accelerated around its axial jet. The extremely magnetic bubble can inflate over its original size, depending on the initial Alfvén Mach number $M_A$ of the launched flow. The shape-independent slope $\partial{}v_r/\partial{}r=2/3t$ is a salient feature of the self-similarity in the acceleration phase. Peculiar kinematic signatures are observable in the position--velocity (PV) diagrams and can combine with other morphological signatures as probes for the density-collimated jets arising in toroidally dominated magnetized winds. The apparent second acceleration is powered by the decrease of the toroidal magnetic field but operates far beyond the scales of the primary magnetocentrifugal launch region and the free asymptotic terminal state. Rich implications may connect the jets arising from the youngest protostellar outflows such as HH 211 and HH 212 and similar systems with parsec-scale jets across the mass and evolutionary spectra.
description: 21 pages, 8 figures, 1 table, to appear in Astrophysical Journal Letters (2023)
MPEC 2023-U282 : 2023 UE10
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 UE10

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Convex Relaxation of Optimal Power Flow, Part I: Formulations and Equivalence
Creators: name: Low, Steven H.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This tutorial summarizes recent advances in the convex relaxation of the optimal power flow (OPF) problem, focusing on structural properties rather than algorithms. Part I presents two power flow models, formulates OPF and their relaxations in each model, and proves equivalence relations among them. Part II presents sufficient conditions under which the convex relaxations are exact.
description: Citation: IEEE Transactions on Control of Network Systems, 15(1):15-27, March 2014. This is an extended version with Appendices VIII and IX that provide some mathematical preliminaries and proofs of the main results
A Galois-Grothendieck-type correspondence for groupoid actions
Creators: name: Paques, Antonio
name: Tamusiunas, Thaísa
Publisher: name: arXiv
Year: 2013
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: Primary: 13B02, 13B05, 16H05, 18B40

description: In this paper we present a Galois-Grothendieck-type correspondence for groupoid actions. As an application a Galois-type correspondence is also given.
description: 12 pages
Extra-Nuclear Starbursts: Young Luminous Hinge Clumps in Interacting Galaxies
Creators: name: Smith, Beverly J.
name: Soria, Roberto
name: Struck, Curtis
name: Giroux, Mark L.
name: Swartz, Douglas A.
name: Yukita, Mihoko
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Hinge clumps are luminous knots of star formation near the base of tidal features in some interacting galaxies. We use archival Hubble Space Telescope UV/optical/IR images and Chandra X-ray maps along with GALEX UV, Spitzer IR, and ground-based optical/near-IR images to investigate the star forming properties in a sample of 12 hinge clumps in five interacting galaxies. The most extreme of these hinge clumps have star formation rates of 1 - 9 M(sun)/yr, comparable to or larger than the `overlap' region of intense star formation between the two disks of the colliding galaxy system the Antennae. In the HST images, we have found remarkably large (~70 pc) and luminous (M(I) ~ 12.2 to -16.5) sources at the centers of these hinge clumps, sometimes embedded in a linear ridge of fainter star clusters. We have found strong X-ray emission from several of these hinge clumps. In most cases, this emission is well-resolved with Chandra and has a thermal X-ray spectrum, thus it is likely due to hot gas associated with the star formation. The ratio of the extinction-corrected diffuse X-ray luminosity to the mechanical energy rate (the X-ray production efficiency) for the hinge clumps is similar to that in the Antennae galaxies, but higher than those for regions in the normal spiral galaxy NGC 2403. Two of the hinge clumps have point-like X-ray emission much brighter than expected for hot gas; these sources are likely `ultra-luminous X-ray sources' (ULXs) due to accretion disks around black holes. The most extreme of these sources, in Arp 240, has a hard X-ray spectrum and an absorbed X-ray luminosity of ~2 X 10^41 erg/s; more than expected by single high mass X-ray binaries (HMXBs), thus it may be either a collection of HMXBs or an intermediate-mass black hole (>=80 M(sun)). [ abridged ]
description: Astronomical Journal, in press
The chromosphere underneath a Coronal Bright Point
Creators: name: Bose, Souvik
name: Nóbrega-Siverio, Daniel
name: De Pontieu, Bart
name: van der Voort, Luc Rouppe
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Coronal Bright Points (CBPs) are sets of small-scale coronal loops, connecting opposite magnetic polarities, primarily characterized by their enhanced extreme-ultraviolet (EUV) and X-ray emission. Being ubiquitous, they are thought to play an important role in heating the solar corona. We aim at characterizing the barely-explored chromosphere underneath CBPs, focusing on the related spicular activity and on the effects of small-scale magnetic flux emergence on CBPs. We used high-resolution observations of a CBP in H$β$ and Fe I 617.3 nm from the Swedish 1-m Solar Telescope (SST) in coordination with the Solar Dynamics Observatory (SDO). This work presents the first high-resolution observation of spicules imaged in H$β$. The spicules were automatically detected using advanced image processing techniques, which were applied to the Dopplergrams derived from H$β$. Here we report their abundant occurrence close to the CBP ``footpoints", and find that the orientation of such spicules is aligned along the EUV loops, indicating that they constitute a fundamental part of the whole CBP magnetic structure. Spatio-temporal analysis across multiple channels indicates that there are coronal propagating disturbances associated with the studied spicules, producing transient EUV intensity variations of the individual CBP loops. Two small-scale flux emergence episodes appearing below the CBP were analyzed; one of them leading to quiet-sun Ellerman bombs and enhancing the nearby spicular activity. This paper presents unique evidence of the tight coupling between the lower and upper atmosphere of a CBP, thus helping to unravel the dynamic phenomena underneath CBPs and their impact on the latter.
description: Accepted for publication in the Astrophysical Journal. 16 pages, 11 figures. Animations embedded
PER UNA NUOVA EDIZIONE DEL BESTIARIO DI PIERRE DE BEAUVAIS (VERSIONE CORTA)
Creators: name: Capelli, Roberta
Publisher: name: Universit� degli Studi di Trento, Dipartimento di Lettere e Filosofia
Year: 2019

description: Il saggio costituisce la 'Nota editoriale' all'edizione revisionata e tradotta del 'Bestiaire' de Pierre de Beauvais (versione corta), inclusa nell'antologia di 'Bestiari tardoantichi e medievali', dir. F. Zambon, Milano, Bompiani, 2018.
Transport of solids in protoplanetary disks: Comparing meteorites and astrophysical models
Creators: name: Jacquet, Emmanuel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We review models of chondrite component transport in the gaseous protoplanetary disk. Refractory inclusions were likely transported by turbulent diffusion and possible early disk expansion, and required low turbulence for their subsequent preservation in the disk, possibly in a dead zone. Chondrules were produced locally but did not necessarily accrete shortly after formation. Water may have been enhanced in the inner disk because of inward drift of solids from further out, but likely not by more than a factor of a few. Incomplete condensation in chondrites may be due to slow reaction kinetics during temperature decrease. While carbonaceous chondrite compositions might be reproduced in a ``two-component'' picture (Anders 1964), such components would not correspond to simple petrographic constituents, although part of the refractory element fractionations in chondrites may be due to the inward drift of refractory inclusions. Overall, considerations of chondrite component transport alone favor an earlier formation for carbonaceous chondrites relative to their noncarbonaceous counterparts, but independent objections have yet to be resolved.
description: 9 pages, 1 figure. Invited review accepted by Comptes Rendus Geosciences. Dedicated to the memory of Guillaume Barlet (1985-2014)
Food or just a free ride? A meta-analysis reveals the global diversity of the Plastisphere: Supplementary File 1
Creators: name: Wright, Robyn
name: Langille, Morgan
name: Walker, Tony
Publisher: name: figshare
Year: 2020
Subjects: subject: 60504 Microbial Ecology
subject: FOS: Biological sciences

description: Instructions and code for reproducing all analyses - or reproducing all analyses with additional studies - found in "Food or just a free ride? A meta-analysis reveals the global diversity of the Plastisphere", published in The ISME Journal (https://www.nature.com/articles/s41396-020-00814-9)Note that the version published on September 11th 2020 was current at the time of submitting the paper after the first revisions. There could be further changes if I decide to improve things, clarify things or because the changes help someone else to use this.
Supplementary File 1
Creators: name: Wright, Robyn
name: Langille, Morgan
name: Walker, Tony
Publisher: name: figshare
Year: 2020
Subjects: subject: 60504 Microbial Ecology
subject: FOS: Biological sciences

description: This file contains all code for carrying out the analyses found in Food or just a free ride? A meta-analysis reveals the global diversity of the Plastisphere. Note that v3 was current at the time of submitting the paper after the first revisions. I am anticipating that there will be further changes, likely because I have decided to improve things or because the changes help someone else to use this.
Supercritical colliding wind binaries
Creators: name: Abaroa, L.
name: Romero, G. E.
name: Sotomayor, P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Context. Particle-accelerating colliding-wind binaries (PACWBs) are systems that are formed by two massive and hot stars and produce nonthermal (NT) radiation. The key elements of these systems are fast winds and the shocks that they create when they collide. Binaries with nonaccreting young pulsars have also been detected as NT emitters, again as a consequence of the wind-wind interaction. Black holes (BHs) might produce NT radiation by this mechanism if they accrete at super-Eddington rates. In such cases, the disk is expected to launch a radiation-driven wind, and if this wind has an equatorial component, it can collide with the companion star yielding a PACWB. These systems are supercritical colliding wind binaries (SCWBs). Aims. We aim to characterize the particle acceleration and NT radiation produced by the collision of winds in binary systems composed of a superaccreting BH and an early-type star. Methods. We estimated the terminal velocity of the disk-driven wind by calculating the spatial distribution of the radiation fields and their effect on disk particles. We then found the location of the wind collision region and calculated the timescales of energy gain and losses of relativistic particles undergoing diffusive acceleration. With this information, we were able to compute the associated spectral energy distribution of the radiation. Results. We find that the interaction of winds can produce NT emission from radio up to tens of GeV, with luminosities in the range of $\sim 10^{33}-10^{35} \, {\rm erg \, s^{-1}}$, which for the most part are contributed by electron synchrotron and inverse Compton radiation. Conclusions. We conclude that SCWBs, such as some ultraluminous X-ray sources and some Galactic X-ray binaries, are capable of accelerating cosmic rays and producing NT electromagnetic emission from radio to $γ$-rays, in addition to the thermal components.
description: 13 pages, 10 figures. Accepted for publication in Astronomy and Astrophysics
Ferroelectric nematic liquids with conics
Creators: name: Kumari, Priyanka
name: Basnet, Bijaya
name: Wang, Hao
name: Lavrentovich, Oleg D.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Spontaneous electric polarization of solid ferroelectrics follows aligning directions of crystallographic axes. Domains of differently oriented polarization are separated by domain walls (DWs), which are predominantly flat and run along directions dictated by the bulk translational order and the sample surfaces. Here we explore DWs in a ferroelectric nematic (NF) liquid crystal, which is a fluid with polar long-range orientational order but no crystallographic axes nor facets. We demonstrate that DWs in the absence of bulk and surface aligning axes are shaped as conic sections. The conics bisect the angle between two neighboring polarization fields to avoid electric charges. The remarkable bisecting properties of conic sections, known for millennia, play a central role as intrinsic features of liquid ferroelectrics. The findings could be helpful in designing patterns of electric polarization and space charge.
description: Contains main text and supplementary information
NICER/NuSTAR Characterization of 4U 1957+11: A Near Maximally Spinning Black Hole Potentially in the Mass Gap
Creators: name: Barillier, Erin
name: Grinberg, Victoria
name: Horn, David
name: Nowak, Michael A.
name: Remillard, Ronald A.
name: Steiner, James F.
name: Walton, Dominic J.
name: Wilms, Jörn
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: 4U 1957+11 is a black hole candidate system that has been in a soft X-ray spectral state since its discovery. We present analyses of recent joint NICER and NuSTAR spectra, which are extremely well-described by a highly inclined disk accreting into a near maximally spinning black hole. Owing to the broad X-ray coverage of NuSTAR the fitted spin and inclination are strongly constrained for our hypothesized disk models. The faintest spectra are observed out to 20 keV, even though their hard tail components are almost absent when described with a simple corona. The hard tail increases with luminosity, but shows clear two track behavior with one track having appreciably stronger tails. The disk spectrum color-correction factor is anti-correlated with the strength of the hard tail (e.g., as measured by the Compton $y$ parameter). Although the spin and inclination parameters are strongly constrained for our chosen model, the mass and distance are degenerate parameters. We use our spectral fits, along with a theoretical prior on color-correction, an observational prior on likely fractional Eddington luminosity, and an observational prior on distance obtained from Gaia studies, to present mass and distance contours for this system. The most likely parameters, given our presumed disk model, suggest a 4.6 $\mathrm{M_\odot}$ black hole at 7.8 kpc observed at luminosities ranging from $\approx 1.7\%$--$9\%$ of Eddington. This would place 4U 1957+11 as one of the few actively accreting sources within the `mass gap' of ${\approx} 2$--$5\,\mathrm{M_\odot}$ where there are few known massive neutron stars or low mass black holes. Higher mass and distance, however, remain viable.
description: 21 pages. To be published in the Astrophysical Journal
Resilience in Army STARRS: Evaluating psychometrics of a multi-dimensional resilience measure
Creators: name: Reed-Fitzke, Kayla
name: Ferraro, Anthony J.
name: Duncan, James M.
name: Wojciak, Armeda S.
name: Hamilton, Alexus
name: Pippert, Hilary D.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: Pharmacology
Biotechnology
Environmental Sciences not elsewhere classified
Biological Sciences not elsewhere classified
Science Policy
Hematology

description: As policymakers and the U.S. military continue to place an emphasis on the resilience of servicemembers, it is critical to utilize psychometrically sound and valid scales to measure resilience. Using two independent samples of Army soldiers-in-training, this study explored the measurement of resilience in the Army Study to Assess Risk and Resilience among Servicemembers (Army STARRS) New Soldier Study Component (NSS). Exploratory factor analysis (EFA) was used to identify the factor structure of a measure of resilience within the Army STARRS NSS. Confirmatory factor analysis (CFA) was then used to confirm the factor structure, then internal reliability was assessed. Convergent validity of the identified resilience factors was examined using two-tailed bivariate correlations. The EFA identified a three-factor structure of a measure of resilience. The CFA confirm the first-order three-factor structure of stress tolerance, positive orientation, and social resources. Each factor was uniquely distinct from measures of the likelihood of generalized anxiety disorder and major depressive disorder, lifetime stressful events, and social network. Findings highlights the utility of a three-factor aggregate measure of resilience in the Army STARRS NSS and provide practitioners with a more nuanced picture of the role of resilience among soldiers-in-training.
Majorana modes and $p$-wave superfluids for fermionic atoms in optical lattices
Creators: name: Bühler, Adam
name: Lang, Nicolai
name: Kraus, Christina V.
name: Möller, Gunnar
name: Huber, Sebastian D.
name: Büchler, Hans Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We present a simple approach to create a strong $p$-wave interaction for fermions in an optical lattice. The crucial step is that the combination of a lattice setup with different orbital states and $s$-wave interactions can give rise to a strong induced $p$-wave pairing. We identify different topological phases and demonstrate that the setup offers a natural way to explore the transition from Kitaev's Majorana wires to two-dimensional $p$-wave superfluids. We demonstrate how this design can induce Majorana modes at edge dislocations in the optical lattice, and we provide an experimentally feasible protocol for the observation of the non-Abelian statistics.
Identification of galaxy shreds in large photometric catalogs using Convolutional Neural Networks
Creators: name: Di Teodoro, Enrico M.
name: Peek, Josh E. G.
name: Wu, John F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Contamination from galaxy fragments, identified as sources, is a major issue in large photometric galaxy catalogs. In this paper, we prove that this problem can be easily addressed with computer vision techniques. We use image cutouts to train a convolutional neural network (CNN) to identify catalogued sources that are in reality just star formation regions and/or shreds of larger galaxies. The CNN reaches an accuracy ~98% on our testing datasets. We apply this CNN to galaxy catalogs from three amongst the largest surveys available today: the Sloan Digital Sky Survey (SDSS), the DESI Legacy Imaging Surveys and the Panoramic Survey Telescope and Rapid Response System Survey (Pan-STARSS). We find that, even when strict selection criteria are used, all catalogs still show a ~5% level of contamination from galaxy shreds. Our CNN gives a simple yet effective solution to clean galaxy catalogs from these contaminants.
description: Accepted for publication in AJ
High-precision broadband linear polarimetry of early-type binaries III. AO Cassiopeiae revisited
Creators: name: Qadir, Yasir Abdul
name: Berdyugin, Andrei V.
name: Piirola, Vilppu
name: Sakanoi, Takeshi
name: Kagitani, Masato
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The fact that the O-type close binary star system AO~Cassiopeiae exhibits variable phase-locked linear polarization has been known since the mid-1970s. In this work, we re-observe the polarization arising from this system more than 50 years later to better estimate the interstellar polarization and to independently derive the orbital parameters, such as inclination, $i$, orientation, $Ω$, and the direction of the rotation for the inner orbit from the phase-folded polarization curves of the Stokes $q$ and $u$ parameters. The Dipol-2 polarimeter was used to obtain linear polarization measurements of AO~Cassiopeiae in the $B$, $V$, and $R$ passbands with the T60 remotely controlled telescope at an unprecedented accuracy level of $\sim$0.003\%. We have obtained the first proper quantification of the interstellar polarization in the direction heading towards AO~Cas by observing the polarization of three neighboring field stars. We employed a Lomb-Scargle algorithm and detected a clear periodic signal for the orbital period of AO~Cas. The standard analytical method based on a two-harmonics Fourier fit was used to obtain the inclination and orientation of the binary orbit. Our polarimetric data exhibited an unambiguous periodic signal at 1.76 days, thus confirming the orbital period of the binary system of 3.52 days. Most of the observed polarization is of interstellar origin. The de-biased values of the orbital inclination are $i = 63^{\circ} +2^{\circ}/ -3^{\circ}$ and orientation of $Ω= 29^{\circ} (209^{\circ}) \pm 8^{\circ}$. The direction of the binary system rotation on the plane of the sky is clockwise.