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We characterize the 3-D spatial variations of [Fe/H], [Mg/H], and [Mg/Fe] in stars at the time of their formation, across 11 simulated Milky Way (MW)- and M31-mass galaxies in the FIRE-2 simulations, to inform initial conditions for…

Astrophysics of Galaxies · Physics 2022-06-22 Matthew A. Bellardini , Andrew Wetzel , Sarah R. Loebman , Jeremy Bailin

We analyze the radial and vertical metallicity and [alpha/Fe] gradients of the disk stars of a disk galaxy simulated in a fully cosmological setting with the chemodynamical galaxy evolution code, GCD+. We study how the radial abundance…

Astrophysics of Galaxies · Physics 2015-06-16 Awat Rahimi , Kenneth Carrell , Daisuke Kawata

We describe a population of young star clusters (SCs) formed in a hydrodynamical simulation of a gas-rich dwarf galaxy merger resolved with individual massive stars at sub-parsec spatial resolution. The simulation is part of the GRIFFIN…

We present a high-resolution cosmological zoom-in simulation of a group of field dwarf galaxies which includes on-the-fly radiative transfer (RT) and is evolved to $z=0$. Emission from stars is included according to age-dependent spectra,…

Star cluster formation is a major mode of star formation in the extreme conditions of interacting galaxies and violent starbursts. Young clusters are observed to form in a variety of such galaxies, a substantial number resembling the…

Astrophysics · Physics 2007-05-23 P. Anders , U. Fritze--v. Alvensleben , R. de Grijs

Within disk galaxies, the velocity dispersion, $\sigma$, of stars increases with age, $\tau$, as measured in the Milky Way (MW) and nearby galaxies. This relation provides a key window into galactic formation history, tracing both the…

Astrophysics of Galaxies · Physics 2025-06-16 Fiona McCluskey , Andrew Wetzel , Sarah Loebman , Jorge Moreno

This chapter reviews how galactic inflows influence galaxy metallicity. The goal is to discuss predictions from theoretical models, but particular emphasis is placed on the insights that result from using models to interpret observations.…

Astrophysics of Galaxies · Physics 2017-05-31 Kristian Finlator

We test if the cosmological zoom-in simulations of isolated galaxies from the FIRE project reproduce the properties of ultra diffuse galaxies. We show that stellar feedback-generated outflows that dynamically heat galactic stars, together…

The spatial decorrelation of dense molecular gas and young stars observed on $\lesssim 1$ kiloparsec scales in nearby galaxies indicates rapid dispersal of star-forming regions by stellar feedback. We explore the sensitivity of this…

Astrophysics of Galaxies · Physics 2021-09-15 Vadim A. Semenov , Andrey V. Kravtsov , Nickolay Y. Gnedin

We present a study of the variation of spatial structure of stellar populations within dwarf galaxies as a function of the population age. We use deep Hubble Space Telescope/Advanced Camera for Surveys imaging of nearby dwarf galaxies in…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 N. Bastian , D. R. Weisz , E. D. Skillman , K. B. W. McQuinn , A. E. Dolphin , R. A. Gutermuth , J. M. Cannon , B. Ercolano , M. Gieles , R. C. Kennicutt , F. Walter

We have investigated the metallicity distributions of mono-age stellar populations across the disc of $6 \lesssim R \lesssim 12$\,kpc and $|Z| \lesssim 2$\,kpc using samples selected from the main-sequence turn-off and sub-giant (MSTO-SG)…

Astrophysics of Galaxies · Physics 2018-11-28 C. Wang , X. -W. Liu , M. -S. Xiang , Y. Huang , B. -Q. Chen , H. -B. Yuan , J. -J. Ren , H. -W. Zhang , Z. -J. Tian

We aim to analyse the metallicity and the ages of the stellar halos of low-mass galaxies to better understand their formation history. We use 17 simulated low-mass galaxies from the Auriga Project ($\sim 3 \times 10^8 \, M_\odot \leq M_*…

The smallest dwarf galaxies are the most straight forward objects in which to study star formation processes on a galactic scale. They are typically single cell star forming entities, and as small potentials in orbit around a much larger…

Astrophysics · Physics 2011-08-23 Eline Tolstoy

The distribution of gas-phase metals within galaxies encodes the impact of stellar feedback on galactic evolution. At high-redshift, when galaxies are rapidly assembling, feedback-driven outflows and turbulence can strongly reshape radial…

We analyze the stellar mass-to-light ratio (M/L) gradients in a large sample of local galaxies taken from the Sloan Digital Sky Survey, spanning a wide range of stellar masses and morphological types. As suggested by the well known…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 C. Tortora , N. R. Napolitano , A. J. Romanowsky , Ph. Jetzer , V. F. Cardone , M. Capaccioli

Galaxy-galaxy interactions rearrange the baryons in galaxies and trigger substantial star formation; the aggregate effects of these interactions on the evolutionary histories of galaxies in the Universe are poorly understood. We combine B…

Astrophysics · Physics 2009-11-07 Elizabeth Barton Gillespie , Margaret J. Geller , Scott J. Kenyon

(Abridged) Interacting galaxies are well-known for their high star formation rates and rich star cluster populations, but the rapidly changing tidal field can also efficiently destroy clusters. We use numerical simulations of merging disc…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 J. M. Diederik Kruijssen , F. Inti Pelupessy , Henny J. G. L. M. Lamers , Simon F. Portegies Zwart , Nate Bastian , Vincent Icke

The stellar metallicity and abundance ratio gradients from the fiducial late-type galaxy simulation of Stinson et al. (2010) are presented. Over 1-3 scalelengths, gradients are shown to flatten with time, consistent with empirical evidence…

Astrophysics of Galaxies · Physics 2012-02-15 K. Pilkington , B. K. Gibson

We have constructed a family of simple models for spiral galaxy evolution to allow us to investigate observational trends in star formation history with galaxy parameters. The models are used to generate broad band colours from which ages…

Astrophysics · Physics 2009-10-31 Eric F. Bell , Richard G. Bower

We have developed a simple, static model designed to place a very solid lower limit on the star formation rate (SFR) expected in a dwarf disk galaxy, which leads to the prediction of a previously undocumented relation between HI mass, M_HI,…

Astrophysics · Physics 2007-05-23 Edward N Taylor