Results 1 to 10 of about 3,286 (161)

Protostellar Jets in Star Cluster Formation and Evolution. I. Implementation and Initial Results

open access: yesThe Astronomical Journal
Stars form in clusters from the gravitational collapse of giant molecular clouds, which is opposed by a variety of physical processes, including stellar feedback. The interplay between these processes determines the star formation rate of the clouds.
Sabrina M. Appel   +10 more
doaj   +1 more source

Chemical Evolution of Bulges of Active Galactic Nuclei in the Early Universe: Roles of Accreting Stars

open access: yesThe Astrophysical Journal
JWST/NIRCam observations reveal dense stellar cores in high-redshift galactic bulges, indicative of sustained star formation and potential stellar accretion.
Shuo Zhai   +4 more
doaj   +1 more source

Active Galactic Nucleus Feedback-induced Stellar Density Expansion in the Inner Regions of Early-type Galaxies

open access: yesThe Astrophysical Journal
Observations indicate that early-type galaxies exhibit varying slopes in the relation between their central stellar surface density and stellar mass (Σ _1 – M _⋆ ).
Fazeel Mahmood Khan   +4 more
doaj   +1 more source

Tracing Galaxy Evolution in the Nearby Universe: The Role of Dark Matter

open access: yesThe Astronomical Journal
Using a sample of ∼126,000 late-type galaxies (LTGs) from the Sloan Digital Sky Survey, we analyzed stellar mass as a function of the dynamical mass. Stellar masses are estimated using eight stellar population synthesis (SPS) models with constant initial
A. Nigoche-Netro   +8 more
doaj   +1 more source

Euclid preparation

open access: yesAstronomy & Astrophysics
The Cosmic Dawn Survey pre-launch catalogues cover an effective 10.13 deg2 area with uniform deep Spitzer/IRAC data (m ∼ 25 mag, 5σ), the largest area covered to these depths at IR wavelengths.
Zalesky L.   +305 more
doaj   +1 more source

A Two-stage Settling of the Milky Way Disk Revealed by Precise ChronoGal Ages

open access: yesThe Astrophysical Journal Letters
The spatial distribution of Galactic disk stars of different ages and metallicities encodes its dynamical evolution history and formation pathways. The lack of precise ages for large, representative samples of stars has traditionally been a drawback for ...
David Mirabal   +11 more
doaj   +1 more source

A Unified Framework Connecting Chemical Enrichment to Resolved Star Formation Histories with Applications to Local Group Dwarf Irregulars

open access: yesThe Astrophysical Journal
We present a new framework for modeling the chemical enrichment histories of galaxies by integrating chemical evolution with resolved star formation histories (SFHs) derived from color–magnitude diagrams.
Christopher T. Garling   +6 more
doaj   +1 more source

A Spectroscopic Survey of Metal-poor OB Stars in Local Dwarf Galaxy NGC 3109

open access: yesThe Astrophysical Journal
As JWST uncovers increasingly strong evidence that metal-poor, massive stars in early galaxies dominated reionization, observational constraints on the properties of such stars are more relevant than ever before.
Abby Mintz   +5 more
doaj   +1 more source

ΛCDM Star Clusters at Cosmic Dawn: Stellar Densities, Environment, and Equilibrium

open access: yesThe Astrophysical Journal
The James Webb Space Telescope (JWST) has opened a window on many new puzzles in the early Universe, including a population of high-redshift star clusters with extremely high stellar surface density, suggesting unique star formation conditions in the ...
Claire E. Williams   +9 more
doaj   +1 more source

Searching within Galaxies for the Earliest Signs of Quenching With Spatially Resolved Star Formation Histories in UVCANDELS Galaxies at z < 0.3

open access: yesThe Astrophysical Journal
Understanding the complicated processes that regulate star formation and cause a galaxy to become quiescent is key to our comprehension of galaxy evolution.
Charlotte Olsen   +20 more
doaj   +1 more source

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