Showing astro-ph.GAShow all

237 papers · 1 filter

astro-ph.GA2026★ 1 cited

Euclid: Early Release Observations -- Internal kinematics and the convective-transition gap of NGC 6397

M. Griggio, M. Libralato, R. Gerasimov +130

We present a 'multiple-pass' data-reduction tool designed for Euclid, based on software developed for the Hubble Space Telescope (HST), which improves the astrometric and photometr…

astro-ph.GA2026

The JWST Resolved Stellar Populations Early Release Science Program. IX. The RR Lyrae Population in WLM with HST and JWST

Catherine M. Slaughter, Evan D. Skillman, Alessandro Savino +16

RR Lyrae stars are a common, dependable Population II distance indicator, and provide an independent tracer of early star formation. Here, we utilize archival HST/ACS and JWST/NIRC…

astro-ph.GA2025★ 6 cited

A Galactic Self-Portrait: Density Structure and Integrated Properties of the Milky Way Disk

Julie Imig, Jon A. Holtzman, Gail Zasowski +23

The evolution history of the Milky Way disk is imprinted in the ages, positions, and chemical compositions of individual stars. In this study, we derive the intrinsic density distr…

astro-ph.GA2025★ 1 cited

JWST imaging of omega Centauri -- I. Luminosity and mass functions of its main sequence populations

M. Scalco, R. Gerasimov, L. R. Bedin +10

This paper presents the first study of the most massive globular cluster (GC) in the Milky Way, omega Centauri, employing recently acquired JWST deep images. By combining these dat…

astro-ph.GA2025

Prospects for studying million-degree gas in the Milky Way halo using the forbidden optical [FeX] and [FeXIV] intersystem lines

P. Richter, F. Ruenger, N. Lehner +5

The Milky Way is surrounded by large amounts of hot gas at temperatures T>10^6 K, which represents a major baryon reservoir. We here explore the prospects of studying the hot coron…

astro-ph.GA2025

Studying the gaseous outskirts of galaxy groups with coherent Ly alpha absorption patterns

P. Richter, J. C. Charlton, A. J. Fox +2

In this study, we explore the properties of diffuse intergalactic gas residing in the outskirts of the four nearby, low-mass galaxy groups NGC1052, NGC5866, NGC4631, and NGC3992 (a…

astro-ph.GA2025★ 8 cited

ALMA-JELLY I: High Resolution CO(2-1) Observations of Ongoing Ram Pressure Stripping in NGC 4858 Reveal Asymmetrical Gas Tail Formation and Fallback

Harrison J. Souchereau, Jeffrey D. P. Kenney, Pavel Jachym +13

We present new CO(2-1) observations (resolution pc) of the Coma cluster jellyfish galaxy NGC 4858 obtained from the ALMA-JELLY large program. Analyzing this data alon…

astro-ph.GA2025

Stellar Parameters for over Fifty Million stars from SMSS DR4 and Gaia DR3

Yang Huang, Timothy C. Beers

We present an updated catalog of stellar parameters, including effective temperature, luminosity classification, and metallicity, for over fifty million stars from the SkyMapper So…

astro-ph.GA2025★ 7 cited

Magnetic fields limit the mass of Population III stars even before the onset of protostellar radiation feedback

Piyush Sharda, Shyam H. Menon, Roman Gerasimov +5

The masses of Population III stars are largely unconstrained since no simulations exist that take all relevant primordial star formation physics into account. We perform the first…

astro-ph.GA2024★ 16 cited

A slightly oblate dark matter halo revealed by a retrograde precessing Galactic disk warp

Yang Huang, Qikang Feng, Tigran Khachaturyants +7

The shape of the dark matter (DM) halo is key to understanding the hierarchical formation of the Galaxy. Despite extensive efforts in recent decades, however, its shape remains a m…

astro-ph.GA2024★ 42 cited

Simulations predict intermediate-mass black hole formation in globular clusters

Michiko S. Fujii, Long Wang, Ataru Tanikawa +2

Intermediate-mass black holes (IMBHs) are those between 100 and 10 solar masses (); their formation process is debated. One possible origin is the growth of less mas…

astro-ph.GA2024★ 8 cited

A Blueprint for the Milky Way's Stellar Populations. V. 3D Local Dust Extinction

Deokkeun An, Timothy C. Beers, Anirudh Chiti

Using a grid of empirically calibrated synthetic spectra developed in our previous study, we construct an all-sky 3D extinction map from the large collection of low-resolution XP s…

astro-ph.GA2023★ 19 cited

Candidate Members of the VMP/EMP Disk System of the Galaxy from the SkyMapper and SAGES Surveys

Jihye Hong, Timothy C. Beers, Young Sun Lee +15

Photometric stellar surveys now cover a large fraction of the sky, probe to fainter magnitudes than large-scale spectroscopic surveys, and are relatively free from the target-selec…

astro-ph.GA2023★ 6 cited

Probing the Galactic halo with RR Lyrae stars -- IV. On the Oosterhoff dichotomy of RR Lyrae stars

Shan Zhang, Gaochao Liu, Yang Huang +8

We use 3653 (2661 RRab, 992 RRc) RR Lyrae stars (RRLs) with 7D (3D position, 3D velocity, and metallicity) information selected from SDSS, LAMOST, and Gaia EDR3, and divide the sam…

astro-ph.GA2023★ 72 cited

A Tale of Two Disks: Mapping the Milky Way with the Final Data Release of APOGEE

Julie Imig, Cathryn Price, Jon A. Holtzman +24

We present new maps of the Milky Way disk showing the distribution of metallicity ([Fe/H]), -element abundances ([Mg/Fe]), and stellar age, using a sample of 66,496 red giant st…

astro-ph.GA2023★ 15 cited

The chemical evolution of the solar neighbourhood for planet-hosting stars

Marco Pignatari, Thomas C. L. Trueman, Kate A. Womack +13

Theoretical physical-chemical models for the formation of planetary systems depend on data quality for the Sun's composition, that of stars in the solar neighbourhood, and of the e…

astro-ph.GA2023★ 7 cited

MUSE-ALMA Haloes IX: Morphologies and Stellar Properties of Gas-rich Galaxies

Arjun Karki, Varsha P. Kulkarni, Simon Weng +15

Understanding how galaxies interact with the circumgalactic medium (CGM) requires determining how galaxies morphological and stellar properties correlate with their CGM properties.…

astro-ph.GA2023

Roman Early-Definition Astrophysics Survey Opportunity: Galactic Roman Infrared Plane Survey (GRIPS)

Roberta Paladini, Catherine Zucker, Robert Benjamin +67

A wide-field near-infrared survey of the Galactic disk and bulge/bar(s) is supported by a large representation of the community of Galactic astronomers. The combination of sensitiv…

astro-ph.GA2023★ 15 cited

Galactic ArchaeoLogIcaL ExcavatiOns (GALILEO) II. t-SNE Portrait of Local Fossil Relics and Structures

Mario Ortigoza-Urdaneta, Katherine Vieira, José G. Fernández-Trincado +7

Based on high-quality APOGEE DR17 and Gaia DR3 data for 1,742 red giants stars within 5 kpc of the Sun and not rotating with the Galactic disc ( 100 km s), we use the…

astro-ph.GA2023★ 4 cited

On the Metallicities and Kinematics of the Circumgalactic Media of Damped Ly Systems at

Stephanie M. Urbano Stawinski, Kate H. R. Rubin, J. Xavier Prochaska +7

We use medium- and high-resolution spectroscopy of close pairs of quasars to analyze the circumgalactic medium (CGM) surrounding 32 damped Ly absorption systems (DLAs). The prim…

astro-ph.GA2023

The Halo21 Absorption Modeling Challenge: Lessons From "Observing" Synthetic Circumgalactic Absorption Spectra

Zachary Hafen, Sameer, Cameron Hummels +7

In the Halo21 absorption modeling challenge we generated synthetic absorption spectra of the circumgalactic medium (CGM), and attempted to estimate the metallicity, temperature, an…

astro-ph.GA2023★ 17 cited

Insights on the Sun birth environment in the context of star-cluster formation in hub-filament systems

Doris Arzoumanian, Sota Arakawa, Masato I. N. Kobayashi +7

Cylindrical molecular filaments are observed to be the main sites of Sun-like star formation, while massive stars form in dense hubs, at the junction of multiple filaments. The rol…

astro-ph.GA2023★ 2 cited

The Origin of the Large Magellanic Cloud Globular Cluster NGC 2005

Andrés E. Piatti, Yutaka Hirai

The ancient Large Magellanic Cloud (LMC) globular cluster NGC 2005 has recently been reported to have an ex-situ origin, thus, setting precedents that the LMC could have partially…

astro-ph.GA2023★ 8 cited

EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies

Yi Xu, Masami Ouchi, Yuki Isobe +49

We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of and low stellar masses of $10^4-…