🔭 Category

astro-ph.GA

317 papers

Stellar halos of bright central galaxies II: Scaling relations, colors and metallicity evolution with redshift

Using the updated FEGA25 semi-analytic model, this study reveals that stellar halos around bright central galaxies act as dynamically and chemically coupled transition regions to the intracluster light, with their scaling relations, colors, and metallicity evolution across cosmic time showing strong agreement with observed colors but suggesting a larger contribution from disrupted dwarf galaxies than currently predicted.

Emanuele Contini, Marilena Spavone, Rossella Ragusa, Enrica Iodice, Sukyoung K YiWed, 11 Ma🔭 astro-ph

Lyman-α\alpha Escape through Anisotropic Media

This paper employs Monte Carlo radiative transfer simulations to demonstrate that Lyman-α\alpha photons escaping through anisotropic, porous neutral gas traverse channels of substantial optical depth rather than the lowest-density paths, leading to suppressed central flux and complex spectral features that challenge the use of Lyα\alpha as a direct proxy for ionizing photon escape.

Silvia Almada Monter, Max Gronke, Seok-Jun ChangWed, 11 Ma🔭 astro-ph

Numerical effects on the stripping of dark matter and stars in IllustrisTNG galaxy groups and clusters

This study of IllustrisTNG simulations reveals that while dark matter stripping from satellites is largely resolution-independent, stellar mass stripping is strongly resolution-dependent, with higher resolutions delaying disruption and producing more compact satellites that generate more concentrated stellar haloes, potentially explaining the overprediction of stellar halo mass at large radii.

Mark R. Lovell (ICC Durham, Durham Physics, University of Iceland), Annalisa Pillepich (MPIA), Christoph Engler (MPIA), Dylan Nelson (Heidelberg), Rahul Ramesh (Heidelberg), Volker Springel (MPA), Lars Hernquist (ITP Harvard)Wed, 11 Ma🔭 astro-ph

Stochastic modelling of cosmic-ray sources for Galactic diffuse emissions

This paper employs stochastic Monte Carlo simulations to demonstrate that the discreteness of supernova remnant cosmic-ray sources introduces significant, energy-dependent uncertainties in Galactic diffuse gamma-ray and neutrino emission predictions, particularly in time-dependent diffusion scenarios, which may help reconcile theoretical models with high-energy observations from LHAASO and future experiments.

Anton Stall, Philipp MertschWed, 11 Ma🔭 astro-ph

Taking a Break at Cosmic Noon: Continuum-selected Low-mass Galaxies Require Long Burst Cycles

This study utilizes JWST observations of 43 low-mass galaxies at cosmic noon to demonstrate that their star formation is governed by long-duration burst cycles with significant quiescent phases, challenging the notion that these systems should be classified solely by their instantaneous star formation rates.

Abby Mintz, David J. Setton, Jenny E. Greene, Joel Leja, Bingjie Wang, Emilie Burnham, Katherine A. Suess, Hakim Atek, Rachel Bezanson, Gabriel Brammer, Sam E. Cutler, Pratika Dayal, Robert Feldmann, Lukas J. Furtak, Karl Glazebrook, Gourav Khullar, Vasily Kokorev, Ivo Labbé, Jorryt Matthee, Michael V. Maseda, Tim B. Miller, Ikki Mitsuhashi, Themiya Nanayakkara, Richard Pan, Sedona H. Price, John R. Weaver, Katherine E. Whitaker, Belinda WuWed, 11 Ma🔭 astro-ph

Radio Spectral Energy Distribution of Low-zz Metal Poor Extreme Starburst Galaxies: Novel insights on the escape of ionizing photons

This study presents new multi-frequency radio observations and modeling of low-redshift, metal-poor extreme starburst galaxies, revealing their flat high-frequency spectral indices and free-free absorption features to provide novel insights into dust content and the correlation between radio spectral properties and the escape of ionizing photons.

Omkar Bait, Daniel Schaerer, Yuri I. Izotov, Biny SebastianWed, 11 Ma🔭 astro-ph

Possible Extragalactic Origins of Five LMC Globular Clusters: Proper Motion Deviations in Gaia DR3

Using Gaia DR3 proper motion data, this study identifies five Large Magellanic Cloud globular clusters with significant kinematic deviations from local stellar populations, suggesting they may have extragalactic origins resulting from past merger events or accretion from the north-eastern region, potentially triggering star formation in the Tarantula Nebula.

Tamojeet Roychowdhury, Navdha BhallaWed, 11 Ma🔭 astro-ph

Relativistic Corrections to the Formation Rate of Extreme Mass-Ratio Inspirals

This paper presents a relativistically self-consistent analytic framework for estimating Extreme Mass-Ratio Inspirals (EMRIs) that, by generalizing the loss-cone angular momentum and revising the plunge pericenter in Schwarzschild spacetime, reveals that relativistic effects increase predicted event rates by approximately a factor of eight compared to Newtonian treatments, thereby underscoring their critical importance for space-based gravitational-wave detectors like LISA and Taiji.

Chen Feng, Yong TangWed, 11 Ma🔭 astro-ph

Black Hole Properties of Type-1 Active Galactic Nuclei in the North Ecliptic Pole Wide Field: I. Mid-infrared Sources with Optical Counterparts

This paper presents reliable black hole property estimates for approximately 450 Type-1 active galactic nuclei in the North Ecliptic Pole Wide field by utilizing mid-infrared continuum luminosities and optical line widths to effectively mitigate dust extinction effects, thereby providing crucial fiducial data for future infrared spectroscopic missions and multi-wavelength AGN studies.

Dohyeong Kim, Myungshin Im, Hyunjin Shim, Minjin Kim, Gu Lim, Junyeong Park, Hayeong Jeong, Yongjung Kim, Yongmin Yoon, Seong Jin Kim, Yoshiki Toba, Tomotsugu Goto, Nagisa Oi, Hyunmi SongWed, 11 Ma🔭 astro-ph

Far-infrared Polarization Properties of Nearby Star-forming Regions: A New Compendium of SOFIA/HAWC+ Observations

This paper presents a comprehensive polarimetric study of 26 nearby molecular clouds using SOFIA/HAWC+ archival data, revealing that far-infrared dust polarization spectra depend strongly on column density and observational resolution, while indicating that magnetic fields in these parsec-scale regions are decoupled from the large-scale Galactic field.

Kaitlyn Karpovich, Susan E. Clark, Enrique Lopez-RodriguezWed, 11 Ma🔭 astro-ph

Resolved molecular gas and star-formation in massive unquenched spirals : I. UGC 8179

This study presents the first resolved molecular gas and star-formation analysis of the massive unquenched spiral UGC 8179, revealing that while it sustains standard local star-formation processes across its extended disc, its central region exhibits suppressed specific star formation rates likely driven by bulge-induced dynamical regulation.

Romane Cologni, Simon Flesch, Philippe Salomé, Damien Le Borgne, Médéric Boquien, Jonathan Freundlich, Pierre Guillard, Ute Lisenfeld, Francoise Combes, Laure BouscasseWed, 11 Ma🔭 astro-ph

ODIN: Spectroscopic Validation of Lyα\alpha-Emitting Galaxy Samples with DESI

The ODIN survey successfully validated its narrow-band selection of Lyman-alpha emitting galaxies at redshifts 2.4, 3.1, and 4.5 using DESI spectroscopy, achieving confirmation rates of 92–96% while identifying active galactic nuclei and lower-redshift emission lines as primary contaminants.

Ethan Pinarski, Govind Ramgopal, Nicole Firestone, Kyoung-Soo Lee, Eric Gawiser, Arjun Dey, A. Raichoor, Francisco Valdes, Robin Ciardullo, Jessica N. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, F. J. Castander, M. Candela Cerdosino, T. Claybaugh, A. Cuceu, K. S. Dawson, A. de la Macorra, P. Doel, S. Ferraro, A. Font-Ribera, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, Lucia Guaita, G. Gutierrez, Stephen Gwyn, H. K. Herrera-Alcantar, Ho Seong Hwang, R. Joyce, S. Juneau, R. Kehoe, D. Kirkby, T. Kisner, A. Kremin, Ankit Kumar, C. Lamman, M. Landriau, L. Le Guillou, M. E. Levi, Yufeng Luo, M. Manera, P. Martini, A. Meisner, R. Miquel, J. Moustakas, A. D. Myers, S. Nadathur, Gautam R. Nagaraj, N. Palanque-Delabrouille, Changbom Park, W. J. Percival, I. Pérez-Ràfols, F. Prada, G. Rossi, E. Sanchez, Marcin Sawicki, D. Schlegel, M. Schubnell, J. Silber, Hyunmi Song, D. Sprayberry, G. Tarlé, Paulina Troncoso Iribarren, B. A. Weaver, Yujin Yang, Ann ZabludoffWed, 11 Ma🔭 astro-ph

Forward-modelling Milky Way Cepheids: selection effects and physical priors in the Gaia-HST calibration

This paper presents a fully forward-modelled Bayesian framework for calibrating Milky Way Cepheids using Gaia EDR3 data, demonstrating that explicitly accounting for Galactic geometry and survey selection effects is essential to avoid biases in the period-luminosity relation and robustly support the local distance-ladder determination of H0H_0.

Richard Stiskalek, Adam Riess, Harry Desmond, Guilhem Lavaux, Dan ScolnicWed, 11 Ma🔭 astro-ph

The role of mass loss in constraining quenching time in dwarf galaxies from AGB and RGB star counts

This study utilizes updated stellar models incorporating dust-driven mass loss to demonstrate that the mass lost by low-mass stars during the RGB phase is the critical factor in calibrating the AGB-to-RGB star ratio, thereby enabling the reconstruction of dwarf galaxy star formation histories with an uncertainty of approximately 1 Gyr.

Paolo Ventura, Richard D'Souza, Flavia Dell'Agli, Eric Bell, Claudio Gavetti, Chiara Fiumi, Marco TailoWed, 11 Ma🔭 astro-ph

Mass regulates the emerging timescale of young star clusters

Based on HST and JWST observations of thousands of young star clusters in four nearby galaxies, this study reveals that the timescale for clusters to emerge from their natal gas is strongly correlated with stellar mass, with massive clusters dispersing their surroundings more rapidly, a finding that challenges current simulations and has significant implications for galactic feedback and planet formation.

Alex Pedrini, Angela Adamo, Daniela Calzetti, Arjan Bik, Thomas J. Haworth, Bruce G. Elmegreen, Mark R. Krumholz, Sean T. Linden, Benjamin Gregg, Helena Faustino Vieira, Varun Bajaj, Jenna E. Ryon, Ahmad A. Ali, Eric P. Andersson, Giacomo Bortolini, Michele Cignoni, Ana Duarte-Cabral, Kathryn Grasha, Natalia Lahén, Thomas S. -Y. Lai, Drew Lapeer, Matteo Messa, Göran Östlin, Elena Sabbi, Linda J. Smith, Monica TosiWed, 11 Ma🔭 astro-ph

FEAST: a NIRSpec/MOS survey of emerging young star clusters in NGC 628

This paper presents the first JWST/NIRSpec multiplex spectroscopy results from the FEAST program in NGC 628, demonstrating the telescope's ability to resolve the spectral properties of emerging young star clusters and their surrounding interstellar medium, thereby revealing a photoionization-dominated feedback regime driven by massive stars before supernovae occur.

Helena Faustino Vieira, Angela Adamo, Neville Shane, Linda J. Smith, Arjan Bik, Thomas S. -Y. Lai, Alex Pedrini, Leslie K. Hunt, Sean T. Linden, Giacomo Bortolini, Anne S. Buckner, Daniela Calzetti, Matteo Correnti, Ana Duarte-Cabral, Kathryn Grasha, Kelsey E. Johnson, Drew Lapeer, Matteo Messa, Göran Östlin, Linn Roos, Elena SabbiWed, 11 Ma🔭 astro-ph

Going Wide and Deep with Roman: The z~6-9 UV luminosity function in a Roman Deep Field

This paper presents a trade study for the Nancy Grace Roman Space Telescope, recommending an ultra-deep survey covering at least 0.56 square degrees with all six filters to optimize the measurement of the high-redshift (z~6–9) UV luminosity function and significantly reduce uncertainties in rest-UV luminosity density compared to existing JWST programs.

Micaela B. Bagley, Steven L. Finkelstein, James Rhoads, Sangeeta Malhotra, L. Y. Aaron Yung, Rachel S. Somerville, Casey PapovichWed, 11 Ma🔭 astro-ph

POLAR-II: modeling star formation history of galaxies on the 21-cm signal from Epoch of Reionization

This study utilizes the Jiutian-300 simulation and L-Galaxies 2020 model to demonstrate that incorporating realistic, time-varying star formation histories—specifically those dependent on stellar age and redshift—significantly alters the topology, timing, and thermal state of the Intergalactic Medium during the Epoch of Reionization, thereby producing distinct 21-cm global signals and power spectra compared to models assuming constant star formation rates.

Qing-Bo Ma, Raghunath Ghara, Benedetta Ciardi, Anshuman Acharya, Bin Yue, Ilian T. Iliev, Léon V. E. Koopmans, Garrelt Mellema, Saleem ZaroubiWed, 11 Ma🔭 astro-ph

ODIN: Confirmation and 3D Reconstruction of Six Massive Protoclusters at Cosmic Noon

The ODIN survey combines wide-field Lyα\alpha imaging with extensive spectroscopy to confirm and reconstruct the 3D structures of six massive protoclusters at cosmic noon (z≈2.4z\approx 2.4 and $3.1$), revealing that galaxies in these dense cores exhibit enhanced emission and early quenching, with environmental effects appearing stronger at higher redshifts.

Ashley Ortiz, Vandana Ramakrishnan, Kyoung-Soo Lee, Arjun Dey, Yucheng Guo, Ethan Pinarski, Anand Raichoor, Francisco Valdes, J. Aguilar, Steven Ahlen, Maria Celeste Artale, Davide Bianchi, August Bliese, David Brooks, Rebecca Canning, Maria Cerdosino, Todd Claybaugh, Andrei Cuceu, Axel de la Macorra, Peter Doel, Jaime Forero, Eric Gawiser, Enrique Gaztanaga, Satya Gontcho, Caryl Gronwall, Lucia Guaita, Gaston Gutierrez, Hiram K. Herrera-Alcantar, Ho Seong Hwang, Woong-Seob Jeong, Dick Joyce, Robert Kehoe, Theodore Kisner, Anthony Kremin, Ankit Kumar, Ofer Lahav, Martin Landriau, Jaehyun Lee, Seong-Kook Lee, Laurent Le Guillou, Marc Manera, Aaron Meisner, Ramon Miquel, Byeongha Moon, John Moustakas, Adam Myers, Seshadri Nadathur, Nathalie Palanque-Delabrouille, Changbom Park, Will Percival, Ignasi Perez-Rafols, Francisco Prada, Eshwar Puvvada, Graziano Rossi, Eusebio Sanchez, David Schlegel, Michael Schubnell, Joseph Harry Silber, Hyunmi Song, David Sprayberry, Gregory Tarle, Paulina Troncoso, Ana Sofia Uzsoy, Benjamin Weaver, Yujin Yang, Rongpu Zhou, Hu ZouWed, 11 Ma🔭 astro-ph