🔭 Category

astro-ph.GA

365 papers

Spiral formation caused by late infall onto protoplanetary disks

This study demonstrates that late infall onto protoplanetary disks can generate distinct spiral structures observable in scattered light and CO line emission, with gradual gas accretion producing well-defined two-armed spirals and active streamer accretion creating flocculent patterns, while noting that these surface-level perturbations generally do not significantly disrupt the midplane unless the infalling mass rivals the disk mass.

L. -A. Hühn, C. N. Kimmig, C. P. Dullemond2026-03-05🔭 astro-ph

The Effect of Different Methods for Accounting for αα-enhancement on the Asteroseismic Modeling of Metal-Poor Stars

This study demonstrates that homogeneous asteroseismic modeling of eight metal-poor, α\alpha-enhanced evolved stars yields consistent fundamental properties regardless of whether α\alpha-enhancement is treated fully or via ad hoc metallicity corrections, while also confirming a breakdown of the νmax\nu_{\text{max}} scaling relation at low metallicities that necessitates detailed modeling for accurate mass and age determinations.

Christopher J. Lindsay, J. M. Joel Ong, Sarbani Basu + 2 more2026-03-05🔭 astro-ph

Most open clusters follow the radial acceleration relation (RAR) and the baryonic Tully-Fisher relation (BTFR)

This study demonstrates that approximately 90% of Milky Way open clusters, particularly those with fewer than 250 stars, align with the radial acceleration relation and baryonic Tully-Fisher relation with an acceleration scale consistent with MOND predictions, suggesting that low-acceleration gravitational dynamics operate on parsec scales within the Galaxy.

Mark D. Huisjes, X. Hernandez2026-03-05🔭 astro-ph

Discovery of a z≃4.9z\simeq 4.9 Lyman-αα Emitter Protocluster: Wavelength-Dependent Environmental Effects on Galaxy Structure

This study reports the discovery of a protocluster at z ≈ 4.9 and reveals that its member galaxies are significantly larger in rest-frame optical light compared to field galaxies, suggesting that dense protocluster environments at this epoch preferentially influence the structure of extended stellar populations through mechanisms like tidal interactions or accelerated star formation.

Ronaldo Laishram, Yusei Koyama, Haruka Kusakabe + 3 more2026-03-05🔭 astro-ph

Accretion onto the Embedded Protostar L1527 IRS: Insights from JWST NIRSpec and MIRI Observations

Using JWST NIRSpec and MIRI observations, this study analyzes atomic hydrogen emission in scattered light from the Class 0 protostar L1527 IRS to characterize its magnetospheric accretion, estimating an accretion rate of approximately $1\times10^{-7}~ \text{M}_\odot \text{yr}^{-1}$ and discussing implications for non-steady, asymmetric accretion processes.

W. Blake Drechsler, John J. Tobin, Patrick D. Sheehan + 12 more2026-03-05🔭 astro-ph

The Stellar Mass Function for Nine Massive Galaxy Clusters in the Local Universe

This study utilizes complete spectroscopic samples from nine massive local galaxy clusters to characterize their stellar mass functions, revealing distinct shapes for quiescent and star-forming populations and identifying a significant excess of intermediate-mass galaxies compared to IllustrisTNG-300 simulations, thereby providing critical constraints for galaxy formation models in dense environments.

Jong-In Park, Jubee Sohn, Margaret J. Geller + 2 more2026-03-05🔭 astro-ph

The influence of galaxy mergers, black-hole growth, and gas processes on the evolution of the stellar mass-gas metallicity relation of galaxies in different cosmic environments

This study reveals that minor mergers, supermassive black hole growth, and gas accretion-starvation balance are the primary drivers of scatter in the stellar mass-gas metallicity relation across cosmic environments, with their specific impacts varying significantly by redshift and environment, particularly showing dominant effects in galaxy nodes.

Aaron R. Rowntree, Fiorenzo Vincenzo, Ankit Singh + 3 more2026-03-05🔭 astro-ph

Morphologies for DECaLS Galaxies through a combination of non-parametric indices and machine learning methods: A comprehensive catalog using the Galaxy Morphology Extractor (galmex) code

This paper introduces the galmex Python package to generate a comprehensive catalog of non-parametric morphological indices for DECaLS galaxies, demonstrating their effectiveness—particularly when combined with LightGBM machine learning—in reliably classifying spiral and elliptical galaxies for future southern hemisphere surveys.

V. M. Sampaio, Y. Jaffé, C. Lima-Dias + 5 more2026-03-05🔭 astro-ph

Properties of Galaxies with Counter-rotating Stellar Disks in the MaNGA Survey

Using the largest sample to date from the MaNGA survey, this study identifies 147 galaxies with counter-rotating stellar disks, classifies them into distinct kinematic types to reveal their origins in gas accretion and evolutionary stages, and demonstrates that the impact of this accretion on galaxy evolution depends primarily on the abundance of pre-existing gas in their progenitors.

Min Bao, Zhenyu Tang, Yanmei Chen + 2 more2026-03-05🔭 astro-ph

A Selection Aware View of Black Hole-Galaxy Coevolution at High Redshift

Using a selection-aware Bayesian framework on JWST JADES data, this study reveals that the black hole-stellar mass relation at high redshift (z≳4z \gtrsim 4) shares the same slope and normalization as the local Universe but exhibits significantly larger intrinsic scatter, suggesting that the mean scaling was established early while the diversity of growth histories remains high.

Francesco Ziparo, Stefano Carniani, Simona Gallerani + 1 more2026-03-05🔭 astro-ph

Exploring gas thermodynamics around galaxies from the Sunyaev-Zel'dovich effects: impact of galaxy-halo connection, 2D projection and velocity field

This paper utilizes hydrodynamical simulations to demonstrate that galaxy-halo connection parameters, 2D projection effects, and velocity field treatments significantly bias the interpretation of Sunyaev-Zel'dovich signals around galaxies, thereby necessitating careful modeling to accurately constrain gas thermodynamics and feedback processes.

Sadaf Kadir, Bernardita Ried Guachalla, Sihan Yuan + 2 more2026-03-05🔭 astro-ph

Understanding the UV/Optical Variability of AGNs through Quasi-Periodic Large-scale Magnetic Dynamos

This paper proposes that large-scale magnetic dynamos in accretion disks generate quasi-periodic, outward-moving temperature fluctuations that successfully explain the observed UV/optical variability of AGNs, including their damped-random-walk characteristics and specific scaling relations with wavelength and black hole mass, which cannot be accounted for by reverberation models or spatially uncorrelated fluctuations.

Hongzhe Zhou, Dong Lai2026-03-04🔭 astro-ph

GA-NIFS: interstellar medium properties and tidal interactions in the evolved massive merging system B14-65666 at z=7.152

This study utilizes JWST/NIRSpec IFU and ALMA observations to characterize the interstellar medium properties, gas-phase metallicity, and tidal interactions within the two distinct cores of the massive merging galaxy system B14-65666 at z=7.152, revealing its unique evolutionary pathway compared to typical high-redshift galaxies.

Gareth C. Jones, Rebecca A. A. Bowler, Andrew J. Bunker + 13 more2026-03-04🔭 astro-ph

On the dependence of galaxy assembly bias on the selection criteria, number density, and redshift of galaxy samples

Using the IllustrisTNG hydrodynamical simulation, this study demonstrates that galaxy assembly bias varies significantly with selection criteria, number density, and redshift, cannot be fully captured by a single secondary halo property, and arises from the interplay between halo assembly bias and occupancy variation, for which the authors propose a fast analytical prediction method.

Sergio García-Moreno, Jonás Chaves-Montero2026-03-04🔭 astro-ph

Modeling transport in weakly collisional plasmas using thermodynamic forcing

This paper introduces a novel "thermodynamic forcing" method implemented in particle-in-cell simulations to systematically model transport in weakly collisional plasmas, revealing that heat-flux saturation under multiple macroscopic gradients is mediated by the bulk-velocity-gradient-driven electron firehose instability rather than the temperature-gradient-driven whistler instability.

Prakriti Pal Choudhury, Archie F. A. Bott2026-03-04🔭 astro-ph