astro-ph.GA papers | Gist.Science

Attaining Spectral Energy Distributions With Sub-Percent Uncertainties: All-Sky DA White Dwarf Spectrophotometric Standard Stars For Large Telescopes And Surveys

This paper presents a project establishing thirty-two faint, all-sky DA white dwarfs as spectrophotometric standard stars with sub-percent uncertainties by validating fully radiative pure hydrogen models against observations, thereby providing an unprecedented ensemble of standards for large telescopes and surveys that complements the existing CALSPEC scale.

Abhijit Saha, Edward W. Olszewski, Benjamin M. Boyd, Thomas Matheson, Tim Axelrod, Gautham Narayan, Annalisa Calamida, Jay B. Holberg, Ivan Hubeny, Ralph C. Bohlin, Susana Deustua, Armin Rest, Jenna Claver, Sean Points, Christopher W. Stubbs, Elena Sabbi, John W. MackentyThu, 12 Ma🔭 astro-ph

Radio selection of heavily obscured AGN in the J1030 field: unraveling a missing Compton-thick population

This study demonstrates that radio selection effectively identifies a previously missed population of heavily obscured, Compton-thick AGNs at high redshifts ( $z>3$ ) in the J1030 field, revealing a number density significantly higher than X-ray-based predictions and highlighting the need for synergistic radio and X-ray observations to fully census these objects.

Giovanni Mazzolari, Roberto Gilli, Marco Mignoli, Marcella Brusa, Isabella Prandoni, Fabio Vito, Ivan Delvecchio, Giorgio Lanzuisi, Alessandro Peca, Andrea Comastri, Stefano Marchesi, Marco Chiaberge, Marisa Brienza, Cristian Vignali, Matilde Signorini, Quirino D'Amato, Fabrizio Gentile, Kazushi Iwasawa, Colin Norman, Alberto Traina, Federica Loiacono, Pietro Baldini, Marianna Annunziatella, Roberto DecarliThu, 12 Ma🔭 astro-ph

The X-ray weakness of Little Red Dots and JWST-selected AGN: comparison with local AGN in different accretion regimes

This study suggests that the observed X-ray weakness in high-redshift Little Red Dots and JWST-selected AGN likely stems from suppressed hot corona emission in highly accreting supermassive black holes, a phenomenon analogous to local super-Eddington systems, while also noting that high-redshift observational limitations may further contribute to the deficit.

A. Tortosa, C. Ricci, P. Du, G. Venturi, L. C. Ho, R. Li, J. -M. Wang, M. BertonThu, 12 Ma🔭 astro-ph

Three Hundred Quasars from the Couch: A first look at high-redshift quasar discovery with SPHEREx

This paper demonstrates that SPHEREx spectrophotometric survey data can effectively confirm high-redshift quasars without ground-based follow-up, successfully discovering 87 new luminous quasars at $z>4$ and 203 lower-redshift objects with a 100% spectroscopic confirmation rate in a subset of candidates.

Frederick B. Davies, Sarah E. I. Bosman, Arpita Ganguly, Eduardo Bañados, Silvia Belladitta, Daniel Stern, Javier A. Acevedo Barroso, Daming Yang, Joseph F. Hennawi, Feige Wang, Jinyi Yang, Xiaohui FanThu, 12 Ma🔭 astro-ph

A Statistical Framework to Identify Kinematically Outlying LMC Globular Clusters and Implications for the LMC's Dark Matter Profile

This paper presents a robust statistical framework using Gaia-DR3 proper motions and line-of-sight velocities to identify kinematically outlying Large Magellanic Cloud globular clusters, revealing that their inclusion can bias dark matter mass estimates by up to 30% and suggesting these clusters may have been accreted from external galaxies.

Tamojeet Roychowdhury, Navdha, Himansh Rathore, Knut A. G. OlsenThu, 12 Ma🔭 astro-ph

Right round: onset and long-term evolution of rotation in star clusters

This study presents the first comprehensive kinematic analysis of Galactic star clusters, revealing that rotation is imprinted during early formation and subsequently eroded by dynamical evolution, with a higher prevalence of rotating systems in young clusters and a tendency for older clusters to align their internal rotation with their orbital motion.

E. Dalessandro, A. Della Croce, E. Vesperini, M. Cadelano, S. Leanza, G. Ettorre, M. HughesThu, 12 Ma🔭 astro-ph

A Kiloparsec-Scale Stellar Cavity in the Center of Abell402-BCG May be Caused by Dynamic Interactions with an Ultramassive Black Hole

JWST and HST observations of the Abell402-BCG reveal a kiloparsec-scale stellar cavity likely caused by dynamic interactions with an actively accreting ultramassive black hole, potentially part of the most massive binary black hole system discovered to date.

Michael McDonald, Gourav Khullar, David Lagattuta, Guillaume Mahler, Shashank Dattathri, Jose M. Diego, Alastair C. Edge, Benjamin Floyd, Michael D. Gladders, Scott A. Hughes, Mathilde Jauzac, Nader Khonji, Gavin Leroy, Richard Massey, Mireia Montes, Priyamvada Natarajan, Michael Reefe, Keren Sharon, Frank van den Bosch, Stepane Werner, Adi ZitrinThu, 12 Ma🔭 astro-ph

A mock data challenge for next-generation detectors

This paper introduces the first Mock Data Challenge for the Einstein Telescope, detailing a simulated dataset of compact binary coalescences and Gaussian noise designed to test analysis pipelines, while providing a tutorial to facilitate community preparation for the observatory's future operations.

Regimbau Tania, Suresh JishnuMon, 09 Ma🔭 astro-ph

Formation of dust clumps in the torus of active galactic nuclei

This paper proposes a new physical model explaining the formation of active galactic nuclei dusty tori as collections of cold gas clumps vertically supported by radiation forces against gravity, a mechanism that naturally accounts for the absence of such tori in low-luminosity AGNs where accretion rates and disk luminosities fall below critical thresholds.

Xinwu Cao, Renyue Cen, Qingwen Wu, Jiancheng WuMon, 09 Ma🔭 astro-ph

Quantifying the C/O Ratio in the Planet-forming Environments around Very Low Mass stars

This study employs chemical kinetics models to demonstrate that an enhanced carbon-to-oxygen (C/O) ratio is necessary to explain the observed hydrocarbon-rich chemistry in the inner disks of very low-mass stars, although a degeneracy between the C/O ratio and stellar X-ray luminosity remains.

Javiera K. Díaz-Berríos, Catherine Walsh, Ewine F. van DishoeckMon, 09 Ma🔭 astro-ph

Star formation outside galaxies undergoing gravitational and hydrodynamic interactions: Dust attenuation and the star formation rate

This study investigates dust attenuation and star formation rates in extragalactic structures formed by different interaction mechanisms, finding that despite their distinct origins, ram-pressure stripped tails and gravitationally induced rings or tidal tails exhibit notably similar dust content and star formation activity.

Geethika Santhosh, Rakhi R, Koshy George, Bianca M. Poggianti, Smitha Subramanian, Kavila IndulekhaMon, 09 Ma🔭 astro-ph

Effect of temperature on the structure of porous dust aggregates formed by coagulation

This study utilizes 3D soft-sphere coagulation simulations to demonstrate that higher temperatures and polydisperse monomer size distributions lead to denser, more compact dust aggregates, while also evaluating the reliability of eight structural metrics and identifying the average number of contact points as the least effective measure.

Lucas Kolanz, Davide Lazzati, Job GuidosMon, 09 Ma🔭 astro-ph

DESI DR2 reference mocks: clustering results from Uchuu-BGS and LRG

This paper presents high-fidelity mock galaxy catalogs for DESI's Bright Galaxy Survey (BGS) and Luminous Red Galaxy (LRG) samples, generated via subhalo abundance matching on the Uchuu simulation, which successfully reproduce observed redshift evolution, clustering statistics, and galaxy-halo connections with high accuracy.

E. Fernández-García, F. Prada, A. Smith, J. DeRose, A. J. Ross, S. Bailey, M. S. Wang, Z. Ding, C. Guandalin, C. Lamman, R. Vaisakh, R. Kehoe, J. Lasker, T. Ishiyama, S. M. Moore, S. Cole, M. Siudek, A. Amalbert, A. Salcedo, A. Hearin, B. Joachimi, A. Rocher, S. Saito, A. Krolewski, Z. Slepian, Q. Li, K. S. Dawson, E. Jullo, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, P. Doel, S. Ferraro, A. Font-Ribera, J. E. Forero-Romero, S. Gontcho A Gontcho, G. Gutierrez, K. Honscheid, M. Ishak, R. Joyce, S. Juneau, D. Kirkby, T. Kisner, A. Kremin, O. Lahav, A. Lambert, M. Landriau, M. E. Levi, M. Manera, R. Miquel, J. Moustakas, S. Nadathur, W. J. Percival, I. Pérez-Ràfols, G. Rossi, E. Sanchez, D. Schlegel, H. Seo, J. Silber, D. Sprayberry, G. Tarlé, B. A. Weaver, P. Zarrouk, R. ZhouMon, 09 Ma🔭 astro-ph

Evidence for Hydrostatic Equilibrium in the Extragalactic Molecular Clouds of M31

This study confirms that molecular clouds in the Andromeda galaxy (M31) exhibit density profiles consistent with hydrostatic equilibrium, demonstrating that their dynamical states and the interplay between turbulence and gravity are similar to those observed in the Milky Way.

Eric Keto, Charles Lada, Jan FrobrichMon, 09 Ma🔭 astro-ph

Dust Evolution in Simulated Multiphase Galactic Outflows

This study utilizes high-resolution simulations to demonstrate that while environmental shielding in cool clouds protects dust grains during galactic outflows, grain size critically determines survival and transport efficiency, with large grains surviving across all phases and small grains being rapidly sputtered in hot gas, ultimately resulting in the hot phase dominating the delivery of surviving dust to the circumgalactic medium.

Helena M. Richie, Evan E. SchneiderMon, 09 Ma🔭 astro-ph

Scales of Stability and Turbulence in the Molecular ISM

By re-analyzing the BU-FCRAO $^{13}$ CO Galactic Ring Survey with a contour-based cloud definition, this study reveals that molecular clouds are high-density regions in hydrostatic equilibrium that evolve toward a time-dependent virial equilibrium driven by external turbulent pressure, while demonstrating that Larson's scaling relations are statistically insignificant and that column density is not constant.

Eric KetoMon, 09 Ma🔭 astro-ph

Implications for Type Ia Supernova Nucleosynthesis from an Experimentally Constrained $^{16}$ O $(p,\alpha)^{13}$ N Reaction Rate

By performing the first direct measurement of the $^{16}$ O $(p,\alpha)^{13}$ N reaction at astrophysical energies, researchers determined a thermonuclear rate approximately 1.5 times higher than standard values, thereby ruling out a previously suggested seven-fold enhancement and concluding that this reaction alone cannot explain observed calcium-to-sulphur and argon-to-sulphur ratio variations in Type Ia supernovae.

M. Alruwaili (University of York, UK, Northern Border University, Saudi Arabia), C. Fougeres (Argonne National Laboratory, USA), A. M. Laird (University of York, UK), H. Jayatissa (Argonne National Laboratory, USA), M. L. Avila (Argonne National Laboratory, USA), E. Bravo (Universidad de Granada, Spain), C. Angus (University of York, UK, TRIUMF, Canada), C. Badenes (University of Pittsburgh, USA), S. Chakraborty (University of York, UK), C. Diget (University of York, UK), N. de Sereville (Institut de Physique Nucleaire d'Orsay, France), A. Hall-Smith (University of York, UK), R. Longland (North Carolina State University, USA, Triangle Universities Nuclear Laboratory, USA), W. -J. Ong (Lawrence Livermore National Laboratory, USA), K. E. Rehm (Argonne National Laboratory, USA), D. Santiago-Gonzalez (Argonne National Laboratory, USA)Mon, 09 Ma🔭 astro-ph

The Prevalence of Turbulence-Regulated Multiphase Galactic Winds in Star-Forming Galaxies

By applying the PEACOCK multi-ion radiative transfer framework to 50 nearby star-forming galaxies, this study reveals that turbulence often dominates the kinetic energy budget of galactic winds and strengthens the coupling between stellar feedback and the circumgalactic medium, supporting a turbulence-regulated picture of multiphase outflows.

Zhihui Li, Timothy Heckman, Max Gronke, Xinfeng Xu, Alaina Henry, Evan Schneider, Matthew Abruzzo, Danielle Berg, Bethan James, Crystal Martin, John ChisholmMon, 09 Ma🔭 astro-ph

Kinematically Coherent Multiphase Galactic Winds in Star-Forming Galaxies Revealed by Unified Radiative Transfer Modeling of UV Emission and Absorption Lines

This paper introduces PEACOCK, a unified Monte Carlo radiative transfer framework accelerated by deep learning, which analyzes 50 nearby star-forming galaxies to reveal that their multiphase galactic winds are kinematically coherent and driven by macroscopic turbulence rather than purely radial acceleration, while showing distinct kinematic structures between neutral hydrogen and metal ions.