bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamical Mass of the Ophiuchus Intermediate-mass Stellar System S1 with DYNAMO-VLBA
Authors: Ordóñez-Toro Jazmín , Dzib Sergio A. , Loinard Laurent , Ortiz-León Gisela , Kounkel Marina A. , Masqué Josep M. , Medina S.-N. X. , Galli Phillip A. B. , Dupuy Trent J. , Rodríguez Luis F. , Quiroga-Nuñez Luis H. 
Published: February 2024

Abstract
We report dynamical mass measurements of the individual stars in the most luminous and massive stellar member of the nearby Ophiuchus star-forming region, the young tight binary system S1. We combine 28 archival data sets with seven recent proprietary Very Long Baseline Array (VLBA) observations obtained as part of the Dynamical Masses of Young Stellar Multiple Systems with the VLBA project (DYNAMO–VLBA), to constrain the astrometric and orbital parameters of the system, and recover high-accuracy dynamical masses. The primary component, S1A, is found to have a mass of 4.11 ± 0.10 M
⊙, significantly lower than the typical value ∼6 M
⊙ previously reported in the literature. We show that the spectral energy distribution (SED) of S1A can be reproduced by a reddened blackbody with a temperature between roughly 14,000 and 17,000 K. According to evolutionary models, this temperature range corresponds to stellar masses between 4 M
⊙ and 6 M
⊙, so the SED is not a priori inconsistent with the dynamical mass of S1A. The luminosity of S1 derived from SED fitting, however, is only consistent with models for stellar masses above 5 M
⊙. Thus, we cannot reconcile the evolutionary models with the dynamical mass measurement of S1A: The models consistent with the location of S1A in the Hertzsprung-Russel diagram correspond to masses higher by 25% at least than the dynamical mass. For the secondary component, S1B, a mass of 0.831 ± 0.014 M
⊙ is determined, consistent with a low-mass young star. While the radio flux of S1A remains roughly constant throughout the orbit, the flux of S1B is found to be higher near apastron.
Analysis of the 3.2–3.3 μm Interstellar Absorption Feature on Three Milky Way Sightlines
Authors: Bernstein L. S. , Geballe T. R. 
Published: February 2024

Abstract
We report new analyses of spectra of the 3.2–3.3 μm absorption feature observed in the diffuse interstellar medium toward three Milky Way sources: 2MASS J17470898 − 2829561 (2M1747) and the Quintuplet Cluster, both located in the Galactic center, and Cygnus OB2-12. The 3.2–3.3 μm interval coincides with the CH-stretching region for compact polycyclic aromatic hydrocarbons (PAHs). We focus on the 2M1747 spectrum. Its published optical depth spectrum contains residual telluric transmission features, which arise from the 0.06 difference in mean airmasses between the observations of the source and its telluric standard star. We corrected the published spectrum by adding the airmass residual optical depth spectrum. The corrected spectrum is well fit by a superposition of four Gaussians. The absorption spectra of the other two sources were also fit by four Gaussians, with similar central wavelengths, widths, and relative peak opacities. We associate the three longer wavelength Gaussians covering the 3.23–3.31 μm interval with compact PAHs in positive, neutral, and negative charge states. We identify the shortest-wavelength Gaussian, near 3.21 μm, with irregularly shaped PAHs. Constraints imposed by spectral smoothness on the corrected 2M1747 spectrum, augmented by a PAH cluster formation model for post-asymptotic giant branch stars, suggests that >99% of the PAHs in the diffuse interstellar medium reside in small clusters. This study supports the PAH hypothesis, and it suggests that a family of primarily compact PAHs with a C66H20 (circumvalene) parent is consistent with the observed mid-infrared and ultraviolet interstellar absorption spectrum.
Gamma-Ray Burst Detection with Poisson-FOCuS and Other Trigger Algorithms
Authors: Dilillo Giuseppe , Ward Kes , Eckley Idris A. , Fearnhead Paul , Crupi Riccardo , Evangelista Yuri , Vacchi Andrea , Fiore Fabrizio 
Published: February 2024

Abstract
We describe how a novel online change-point detection algorithm, called Poisson-FOCuS, can be used to optimally detect gamma-ray bursts within the computational constraints imposed by miniaturized satellites such as the upcoming HERMES-Pathfinder constellation. Poisson-FOCuS enables testing for gamma-ray burst onset at all intervals in a count time series, across all timescales and offsets, in real time and at a fraction of the computational cost of conventional strategies. We validate an implementation with automatic background assessment through exponential smoothing, using archival data from Fermi-GBM. Through simulations of lightcurves modeled after real short and long gamma-ray bursts, we demonstrate that the same implementation has higher detection power than algorithms designed to emulate the logic of Fermi-GBM and Compton-BATSE, reaching the performance of a brute-force benchmark with oracle information on the true background rate, when not hindered by automatic background assessment. Finally, using simulated data with different lengths and means, we show that Poisson-FOCuS can analyze data twice as fast as a similarly implemented benchmark emulator for the historic Fermi-GBM on-board trigger algorithms.
A Study of the Accretion State of Magnetically Arrested Disks across Black Hole Spins for Radiatively Inefficient Accretion Flows
Authors: Zhang G.-Q. , Bégué Damien , Pe’er A. , Zhang B.-B. 
Published: February 2024

Abstract
The study of magnetically arrested disks (MAD) has attracted strong interest in recent years because these disk configurations were found to generate strong jets, as observed in many accreting systems. Here, we present the results of 14 general relativistic magnetohydrodynamic simulations of advection-dominated accretion flow in the MAD state across black hole (BH) spins, carried out with cuHARM. Our main findings are as follows. (i) The jets transport a significant amount of angular momentum to infinity in the form of Maxwell stresses. For positive, high spin, the rate of angular momentum transport is about five times higher than for negative spin. This contribution is nearly absent for a nonrotating BH. (ii) The mass accretion rate and the MAD parameter, both calculated at the horizon, are not correlated. However, their time derivatives are anticorrelated for every spin. (iii) For zero spin, the contribution of the toroidal component of the magnetic field to the magnetic pressure is negligible, while for a fast-spinning BH, it is on the same order as the contribution of the radial magnetic component. For high positive spin, the toroidal component even dominates. (iv) For negative spins, the jets are narrower than their positive-spin counterparts, while their fluctuations are stronger. The weak jet from the nonrotating BH is the widest with the weakest fluctuations. Our results highlight the complex nonlinear connection between the black hole spin and the resulting disk and jet properties in the MAD regime.
Corona-heated Accretion-disk Reprocessing: Frequency-resolved Lag Predictions for UV/Optical Reverberation Mapping of Active Galactic Nuclei
Authors: Chen Jie , Sun Mouyuan , Zhang Zhi-Xiang 
Published: February 2024

Abstract
Continuum reverberation mapping with high-cadence, long-term UV/optical monitoring of active galactic nuclei (AGNs) enables us to resolve the AGN central engine sizes on different timescales. The frequency-resolved time lags of NGC 5548 (the target for the AGN STORM I campaign) are inconsistent with the X-ray reprocessing of the classical Shakura–Sunyaev disk model. Here we show that the frequency-resolved time lags in NGC 5548 can be well produced by the Corona-Heated Accretion-disk Reprocessing (CHAR) model. Moreover, we make CHAR model predictions of the frequency-resolved time lags for Mrk 817, the source of the AGN STORM II campaign. We also obtain frequency-resolved time lags as a function of the BH mass and Eddington ratio, which is valid for BH masses from 106.5 to 109
M
⊙ and Eddington ratios from 0.01 to 1. Moreover, we demonstrate that with the time spans of current continuum reverberation-mapping campaigns, the lag–luminosity relation of the CHAR model can be

τ

gz

∝

L

5100

0.55
±
0.04

, which is consistent with observations. Future observations can test our results and shed new light on resolving the AGN central engine.
Tracing the Layers of Photodissociated Gas in the Trifid Nebula
Authors: Mookerjea Bhaswati , Sandell Göran 
Published: February 2024

Abstract
Photodissociated gas bears the signature of the dynamical evolution of the ambient interstellar medium impacted by the mechanical and radiative feedback from an expanding H ii region. Here we present an analysis of the kinematics of the young Trifid Nebula, based on velocity-resolved observations of the far-infrared fine structure lines of [C ii] at 158 μm and [O i] at 63 μm. The distribution of the photodissociated regions (PDRs) surrounding the nebula is consistent with a shell-like structure created by the H ii region expanding at a velocity of 5 km s−1. Comparison of ratios of [C ii] and [O i]63 μm intensities for identical velocity components with PDR models indicate a density of 104 cm−3. The redshifted and blueshifted PDR shells with a combined mass of 516 M
⊙ have a kinetic energy of ∼1047 erg. This is consistent with the thermal energy of the H ii region as well as with the energy deposited by the stellar wind luminosity from HD 169442A, an O7 V star, over the 0.5 Myr lifetime of the star. The observed momentum of the PDR shell is lower than what theoretical calculations predict for the radial momentum due to the shell being swept up by an expanding H ii region, which suggests that significant mass loss has occurred in M20 due to the dispersal of the surrounding gas by the advancing ionization front.
Comparing SCUBA-2 and ALMA Selections of Faint Dusty Star-forming Galaxies in A2744
Authors: McKay S. J. , Barger A. J. , Cowie L. L. 
Published: February 2024

Abstract
We make a comparison of deep SCUBA-2 450 and 850 μm imaging on the massive lensing cluster field A2744 with Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm data. Our primary goal is to assess how effective the wider-field SCUBA-2 sample, in combination with red JWST priors, is for finding faint dusty star-forming galaxies (DSFGs) compared to the much more expensive mosaicked ALMA observations. We cross-match our previously reported direct (>5σ) SCUBA-2 sample and red JWST NIRCam prior-selected (>3σ) SCUBA-2 sample to direct ALMA sources from the DUALZ survey. We find that roughly 95% are confirmed by ALMA. The red priors also allow us to probe deeper in the ALMA image. Next, by measuring the 450 and 850 μm properties of the full ALMA sample, we show that 46/69 of the ALMA sources are detected at 850 μm and 24/69 are detected at 450 μm in the SCUBA-2 images, with a total detection fraction of nearly 75%. All of the robust (>5σ) ALMA sources that are not detected in at least one SCUBA-2 band lie at 1.2 mm fluxes ≲0.6 mJy and are undetected primarily due to the higher SCUBA-2 flux limits. We also find that the SCUBA-2 detection fraction drops slightly beyond z = 3, which we attribute to the increasing 1.2 mm to 850 μm and 1.2 mm to 450 μm flux ratios combined with the ALMA selection. The results emphasize the power of combining SCUBA-2 data with JWST colors to map the faint DSFG population.
The Missing Symbiotic Stars: A Joint Analysis with Gaia, GALEX, and XMM-Newton Data
Authors: Xu Xiao-jie , Shao Yong , Li Xiang-Dong 
Published: February 2024

Abstract
The existence of a population of low-accretion-rate symbiotic stars (SySts), consisting of a giant star and a compact companion (usually a white dwarf), has been proposed recently. However, their population has not been fully understood. In this work, we present an investigation on SySts candidates consisting of asymptotic giant branch stars (AGBs) by cross-correlating the Gaia DR3, the Galaxy Evolution Explorer All-Sky Imaging Survey, and the 4XMM DR13 catalogs. We first build a sample of AGBs within 500 pc based on their locations in the Gaia color–absolute magnitude diagram. We then explore the UV and X-ray properties of the sampled AGBs and compare them to known SySts and candidates. We find 10 SySts candidates based on the far-ultraviolet excess. The typical UV luminosity of the candidates is 1031 erg s−1, which corresponds to a typical accretion rate of 10−12–10−11
M
⊙ yr−1, which is more than 1 order of magnitude lower than known SySts. Based on these findings, the total number of SySts within 500 pc is estimated to be 18. The number of AGBs with X-ray flux above 10−14 erg s−1 cm−2 within 500 pc is estimated to be 37. Our finding implies that a large number of low-accretion-rate SySts are yet to be detected, which provides a base for a complete understanding of their population.
Powerful Radio Sources in the Southern Sky. III. First Results of the Optical Spectroscopic Campaign
Authors: García-Pérez A. , Peña-Herazo H. A. , Jimenez-Gallardo A. , Chavushyan V. , Massaro F. , White S. V. , Capetti A. , Balmaverde B. , Forman W. R. , Cheung C. C. , Madrid J. P. , Mazzucchelli C. , Nesvadba N. P. H. , Andruchow I. , Cellone S. , Grossová R. , Paggi A. , Sani E. , Reynaldi V. , Kraft R. P. , Leto C. 
Published: February 2024

Abstract
We recently built the G4Jy-3CRE catalog of extragalactic radio sources. This catalog lists 264 powerful radio sources selected with similar criteria to those of the revised Third Cambridge Catalog, but visible from the Southern Hemisphere. A literature search revealed that 119 sources in the G4Jy-3CRE catalog (i.e., 45%) lack a firm spectroscopic redshift measurement. Here, we present a campaign aimed at acquiring optical spectra of G4Jy-3CRE sources and measuring their redshifts. We used single-slit observations obtained with the Víctor Blanco Telescope, the New Technology Telescope, the Southern Astrophysical Research Telescope, and the 2.1 m telescope of the Observatorio Astronómico Nacional at San Pedro Mártir, Mexico. In addition, we analyzed Very Large Telescope/MUSE archival observations. From these observations, we report the spectra and redshifts of 93 sources, 42 of which are the first optical spectra and redshift determinations for the respective sources. With our new data, approximately 71% of the sources in the G4Jy-3CRE catalog now have firm spectroscopic redshift measurements. This data set will be the basis of our future analysis of the optical properties of the G4Jy-3CRE catalog.
A Multibranch Deep Neural Network for the Superresolution of Solar Magnetograms
Authors: Dou Fengping , Xu Long , Zhao Dong , Ren Zhixiang 
Published: February 2024

Abstract
The existing superresolution (SR) models for solar magnetograms are mostly borrowed from the SR models for natural images. They are less effective for processing solar magnetograms with a very large dynamic range and very rich image features. In this paper, a multibranch superresolution (MBSR) model is specially designed for solar magnetograms. First, we split a low-resolution magnetogram into a group of overlapping image patches, and classify them into three categories according to magnetic flux intensity, namely simple, medium, and complex. Then, image patches of each category are fed into the corresponding branch of the MBSR network, the lightweight branch for simple image patches and the heavyweight one for complex image patches. The advantage of such a strategy is twofold. On the one hand, active regions are allocated more computational resources to train a heavyweight branch more fully, while quiet regions are allocated fewer computational resources to train a lightweight branch for saving computational resources. On the other hand, a lightweight network with a simple nonlinear function is preferable to simple regions, while a heavyweight one may be underfitting. Additionally, to verify the effectiveness of the proposed model, a magnetic field structure similarity metric is proposed to measure the artifacts of the generated high-resolution (HR) magnetograms. Experimental results show that the proposed MBSR model generates HR magnetograms highly consistent with the HMI ones, and achieves the best performance over five objective metrics, including peak signal-to-noise ratio and structure similarity, etc.
Reevaluating LSST’s Capability for Time Delay Measurements in Quasar Accretion Disks
Authors: Pozo Nuñez F. , Czerny B. , Panda S. , Kovacevic A. , Brandt W. , Horne K. ,   on behalf of the LSST AGN Science Collaboration
Published: February 2024

Abstract
The Legacy Survey of Space and Time at the Vera C. Rubin Observatory is poised to observe thousands of quasars using the Deep Drilling Fields (DDF) across six broadband filters over a decade. Understanding quasar accretion disk (AD) time delays is pivotal for probing the physics of these distant objects. Pozo Nuñez et al. has recently demonstrated the feasibility of recovering AD time delays with accuracies ranging from 5% to 20%, depending on the quasar’s redshift and time sampling intervals. Here we reassess the potential for measuring AD time delays under the current DDF observing cadence, which is placeholder until a final cadence is decided. We find that contrary to prior expectations, achieving reliable AD time delay measurements for quasars is significantly more challenging, if not unfeasible, due to the limitations imposed by the current observational strategies.
Recherches sur la Sustainability
Authors: Pesqueux Yvon 
Published: February 2024

Un enjeu clé du développement durable est la question de la mesure c’est-à-dire « qui mesure quoi et comment ? » qui va constituer la problématique de ce texte. Après avoir brièvement rappelé la définition de la métrologie, il sera successivement question de la dimension floue de la notion de développement durable comme fondatrice d’une disparité des métrologies correspondantes et, en conclusion, d’une métrologie du contrôle qui s’organise autour du principe de matérialité.
Recherches sur la Sustainability
Authors: Paulet Elisabeth , Mavoori Hareesh 
Published: February 2024

Les réformes bancaires et la régulation ont transformé les facteurs de l’efficacité bancaire. Sur la base de données individuelles de plus de 90 banques européennes, américaines, chinoises et indiennes, nous examinons sur une période de 15 ans (2002-2016) l’évolution de ces facteurs en utilisant une analyse d’enveloppement des données et une frontière stochastique. Notre résultat principal prouve que la libéralisation financière a uniformisé les stratégies bancaires : les statuts ne sont pas les principaux critères pour expliquer l’efficacité. Sur le plan managérial, le contrôle des coûts et la recherche de liquidités sont devenus des facteurs essentiels pour améliorer l’efficacité. L’introduction de considération de développement durable montre en outre le difficile arbitrage entre soutenabilité et performance.
Recherches sur la Sustainability
Authors: Basse Diaga 
Published: February 2024

Le développement durable ou en anglais sustainability development est « un développement qui répond aux besoins du présent sans compromettre la capacité des générations futures à répondre aux leurs » 1 . Il repose sur trois piliers essentiels que sont l’économie, l’environnement et la société. Ce chapitre traite de la décarbonation dans l’aviation dont l’objectif est de minimiser son impact sur le climat en améliorant encore son efficacité. La problématique est donc de comprendre les facteurs d’émission de CO 2 des aéronefs et de mettre en exergue les leviers sur lesquels les acteurs devront s’appuyer pour diminuer l’empreinte carbone du transport aérien sur le réchauffement climatique dont les conséquences sont dramatiques sur les populations. Les principales pistes de réduction des émissions du gaz carbonique néfastes à l’environnement ont trait à l’amélioration des rendements des moteurs d’avion, à la transition énergétique vers les biocarburants et à l’optimisation des opérations aériennes sans oublier les dynamiques humaines qui demeurent les facteurs clés de succès pour l’atteinte des objectifs de développement durable.
Recherches sur la Sustainability
Authors: Moscarola Jean , Mothe Caroline , Delfosse Estelle 
Published: February 2024

A partir de l’analyse de 33 entretiens réalisés auprès des acteurs public et privé, engagés dans la réalisation de réseaux de chaleur et de froid (innovation répondant au besoin de climatisation en été comme en hiver) ce chapitre met en évidence la complexité des réponses aux changements climatiques. Celle- ci tient à l’imbrication et à la multiplicité des possibilités technologiques (chaud et ou froid, collectif et ou individuel) qui se déclinent en stratégies économiques techniques et organisationnelles. Les thèmes évoqués par les professionnels interrogés, leurs motivations et les freins qu’ils rencontrent mettent en évidence leurs difficultés à mettre en œuvre les possibilités technologiques dans la perspective d’un développement durable. L’analyse de ces entretiens montre que les intérêts individuels et les mentalités sont un obstacle à la survenue des changements possibles.
Recherches sur la Sustainability
Authors: Laval Florence , Dudézert Aurélie , Gibert Fanny 
Published: February 2024

Au sortir de la crise sanitaire, la déception et la morosité sont des sentiments largement partagés par les salariés français. Actuellement, d’autres crises continuent d’affecter la relation des salariés au travail et à l’entreprise. Les transformations managériales successives ont accentué les tensions entre les salariés et les acteurs du management, ce qui a impacté la confiance à accorder aux discours et postures affichés par l’entreprise. Comment dans ces conditions, construire une relation de confiance durable avec le salarié ? Comment la pratique managériale peut-elle aider à construire cette relation, au service d’un management responsable, qui repose sur une relation managers/collaborateurs de qualité ? Spécialistes de la GRH et du management des systèmes d’informations, les auteures proposent dans ce chapitre une analyse du vécu et du ressenti des salariés à propos du travail pendant et à la sortie de la crise sanitaire. Les données collectées ont été obtenues grâce à une recherche longitudinale débutée en 2020. L’interprétation de ces données donnera lieu à des recommandations managériales appuyées sur le concept de plasticité et celui de contrat psychologique, afin de construire un management responsable pour faire face aux crises actuelles et futures.
Recherches sur la Sustainability
Authors: Primeau Marie-Douce , Champagne-Caron Cynthia , Romero-Torres Alejandro 
Published: February 2024

Le développement durable et, plus précisément, l’acceptabilité sociale ont pris une importance majeure dans la réalisation de tout projet. En effet, le succès d’un projet va au-delà des trois dimensions du Triangle d’or (échéancier, coûts et portée) pour prendre en compte la « Triple Bottom Line » incluant les aspects sociaux, environnementaux et économiques de leur réalisation et de leurs livrables. Ainsi, l’acceptabilité sociale se place comme un levier pour favoriser la motivation et la participation des parties prenantes à tout projet et facilite leur réalisation. Bien que de nombreuses études aient été menées sur l’acceptabilité sociale des projets dans les dernières années, le concept reste encore flou et mal défini, sans parler des nombreuses contradictions qui entravent la compréhension des facteurs influençant l’acceptabilité sociale des projets. Ce chapitre vise à approfondir les connaissances sur le sujet et à éclaircir les facteurs contribuant à l’acceptabilité sociale dans le contexte de projets. En s’appuyant sur les résultats d’une recension de littérature systématique, ce chapitre vise à contribuer aux connaissances sur le développement durable et l’acceptabilité en classant les facteurs d’acceptabilité sociale en quatre groupes : organisationnels, contextuels, individuels et propres au projet. Cette catégorisation permettra de comprendre les enjeux d’acceptabilité sociale des projets et d’identifier des pistes pour assurer l’adhésion et l’engagement des parties prenantes.