Showing 2026 · astro-ph.GAShow all

26 papers · 2 filters

astro-ph.GA2026

A -like metallicity profile in the disk of the Sagittarius dwarf galaxy

Zixi Guo, Xiang-Xiang Xue, Jiang Chang +12

Unveiling the properties of the progenitors that formed the tidal structures of the Milky Way (MW) is essential for exploring the MW's assembly history. Such studies further afford…

astro-ph.GA2026

The Milky Way's Early Disk Was Built in Bursts. I. Evidence from Low-angular-momentum, High- Stars Scattered Out of the Protodisk by Merger Events

Tiancheng Sun, Maosheng Xiang, Shaolan Bi +3

Stars born in the high- disk can later acquire low angular momentum through dynamical scattering during early merger events. Their age--metallicity distribution thus provides a…

astro-ph.GA2026

Supernova origin of galactic turbulence revealed by superbubbles

Fanyi Meng, Chao-Wei Tsai, Jingwen Wu +13

Supernovae (SNe) are among the leading candidates for powering galactic-scale turbulence. SNe drive expanding shells of neutral atomic hydrogen (HI) known as superbubbles. Due to t…

astro-ph.GA2026★ 1 cited

LenNet: Direct Detection and Localization of Strong Gravitational Lenses in Wide-Field Sky Survey Images

Pufan Liu, Hui Li, Ziqi Li +9

Strong gravitational lenses are invaluable tools for addressing fundamental questions in astrophysics, from the nature of dark matter to the expansion of the universe. While curren…

astro-ph.GA2026

Testing Chemical Tagging with LAMOST: Intrinsic Abundance Dispersion of Subgiant Stars in the Galactic Disk

Wu Yaqian, Xiang Maosheng, Zhao Gang +4

The scatter in elemental abundances among stars of similar age and metallicity reflects chemical inhomogeneity in their birth environments, making abundance scatter a key observabl…

astro-ph.GA2026

Euclid Q1 reveals spatial variations of the extinction law in the dense cloud LDN 1641

Rui Chen, Shu Wang, Xiaodian Chen +1

Dust extinction laws are essential for precision photometry and provide a direct probe of grain properties, but their behaviour in dense molecular clouds remains poorly constrained…

astro-ph.GA2026

Early Results from GLASS-JWST. XXVI. Spatially Resolved Star Formation and Balmer Decrements at from NIRISS Slitless Spectroscopy

Pengfei Ren, Xin Wang, Yuxuan Pang +10

Using JWST/NIRISS slitless spectroscopy, we present spatially resolved Balmer decrement measurements for 79 galaxies at , which are gravitationally lensed by the for…

astro-ph.GA2026

MAMMOTH-Grism: Gas-phase Metallicity Gradients of Star-forming Galaxies in Protocluster Environments at Cosmic Noon

Yi-Ming Yang, Xin Wang, Chao-Wei Tsai +11

Environment plays a crucial role in shaping galaxy formation, yet the impact of overdensities on the internal chemical structure of galaxies at cosmic noon is still under debate. H…

astro-ph.GA2026

The FAST Hundred-Deg HI Deep (HD) Survey: Early Results from the Pilot Survey

Chen Xu, Yingjie Jing, Jie Wang +26

The Hundred-deg HI Deep (HD) survey carried out with the Five-hundred-meter Aperture Spherical Telescope (FAST) is planned to map a contiguous region within the DESI DR1 fo…

astro-ph.GA2026★ 2 cited

Revisiting the mass metallicity relation and the fundamental metallicity relation of dwarf galaxies at cosmic noon with NIRISS

Xianlong He, Zihao Li, Xin Wang +6

We extend the stellar-mass gas-phase metallicity relation (MZR) at down to the extremely low-mass regime using 183 galaxies with , based…

astro-ph.GA2026

A Spatially Resolved HI Survey of Seyfert Galaxies: the Role of AGN Feedback in Shaping Atomic Gas Reservoirs

Ruitian Li, Xin Wang, Daizhong Liu +19

Active galactic nucleus (AGN) feedback is a key ingredient in galaxy evolution, yet its impact on the cold atomic gas reservoir -- the neutral hydrogen (HI) phase -- remains poorly…

astro-ph.GA2026

From Detection to Host Galaxy Identification: Precision Continuous Gravitational Wave Localization with a Few Anchor Pulsars

Chao-Fan Wen, Yi-Qin Chen, Shi-Yi Zhao +2

Pulsar Timing Arrays (PTAs) are rapidly advancing toward the detection of continuous gravitational waves from individual supermassive binary black holes. While it is well establish…

astro-ph.GA2026

Missing pairs in open cluster catalogs

Qingshun Hu, Yufei Cai, Caroline Soubiran +4

Open clusters (OCs) in our Galaxy can be found in pairs, possibly forming physical binaries, or in groups. These objects offer unique insights into the process of star formation an…

astro-ph.GA2026★ 1 cited

Targeted search for eccentric supermassive binary black holes in OJ 287 and nearby galaxy clusters with PPTA DR3

Shi-Yi Zhao, Xingjiang Zhu, Jacob Cardinal Tremblay +19

We perform Bayesian targeted searches for continuous gravitational waves from eccentric supermassive binary black holes (SMBBHs) using the Parkes Pulsar Timing Array third data rel…

astro-ph.GA2026

Extinction Distributions in Nearby Star-resolved Galaxies. II. M33

Yuxi Wang, Yi Ren, Jian Gao +2

Extinction maps are essential for tracing interstellar dust and enabling accurate stellar population studies in galaxies. Here, a high-resolution extinction distribution of nearby…

astro-ph.GA2026★ 1 cited

PhDLspec: physical-prior embedded deep learning method for spectroscopic determination of stellar labels in high-dimensional parameter space

Tianmin Wu, Maosheng Xiang, Jianrong Shi +4

Unlocking the full physical information encoded in low-resolution spectra poses a significant challenge for astronomical survey analysis. Such a task demands modeling spectra and o…

astro-ph.GA2026

SwinYNet: A Transformer-based Multi-Task Model for Accurate and Efficient FRB Search

Yunchuan Chen, Shulei Ni, Chan Li +11

In this study, we present a transformer-based multi-task model for Fast Radio Burst (FRB) detection, signal segmentation, and parameter estimation directly from time-frequency data…

astro-ph.GA2026

Confirmation and Refutation of Lyman Continuum Leakers at with JWST NIRSpec/IFU

Shengzhe Wang, Xin Wang, Hang Zhou +10

Our understanding of the physical mechanisms and environments conducive to the escape of Lyman-continuum (LyC) radiation within the first 2 Gyr of cosmic history remains limited. H…

astro-ph.GA2026★ 4 cited

A Morphology Catalog of Galaxies in CEERS: Evolution in the Size and Color Gradients of Galaxies Since Cosmic Dawn

Elizabeth J. McGrath, Steven L. Finkelstein, Guillermo Barro +42

We present measurements of morphological parameters from fitting 53,885 galaxies detected to a magnitude limit of F356W in the CEERS NIRCam imaging with galfit in six broad…

astro-ph.GA2026

The morphological stability of open clusters: a new 2D perspective

Yuting Li, Qingshun Hu, Yufei Cai +3

Open clusters (OCs) usually evolve gradually as the number of their members changes, which can be manifested in their morphological characteristics. We aim to investigate the morph…

astro-ph.GA2026

The Optical Properties of Host Galaxies of Radio Sources in the Coma Cluster

Xiaolan Hou, Heng Yu, Tong Pan +4

We present a comprehensive study of host galaxies of radio sources within the 1.35 of the Coma cluster by combining deep 144MHz observations from the LOFAR Two-Metre Sky S…

astro-ph.GA2026

Cosmic-ray electron propagation in NGC 3044 from radio continuum observations

Shengtao Wang, Xiaohui Sun, George Heald +5

Star-forming edge-on galaxies often exhibit extended halo radiation in multiple bands, providing ideal laboratories for studying the transfer of matter from the disk to the halo. W…

astro-ph.GA2026

The Structure and Evolution of LRDs: Insights from JWST NIRSpec Medium and High Resolution Spectroscopy at

Yuxuan Pang, Xin Wang, Cheng Cheng +5

We present an analysis of medium/high-resolution JWST/NIRSpec spectra for 11 LRDs at . By decomposing the broad and narrow components of the Balmer emission lines, we inv…

astro-ph.GA2026★ 1 cited

An Enhanced Isothermal Jeans Approach to Constraining Dark Matter Self-Interactions from Galactic Kinematics

Zixiang Jia, Fangzhou Jiang, Shubo Li +3

We present an improved semi-analytical model to predict density profiles of self-interacting dark matter (SIDM) halos and apply it to constrain the self-scattering cross section us…