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From the analysis of the color-magnitude diagrams and color functions of four wide LMC fields located from ~2 to 6 kpc from the kinematic center of the LMC we present evidence that, while the oldest population is coeval in all fields, the…

Astrophysics · Physics 2009-11-13 C. Gallart , P. B. Stetson , I. Meschin , F. Pont , E. Hardy

We present a 2D kinematic analysis out to ~2-5 effective radii (Re) of 33 massive elliptical galaxies with stellar velocity dispersions larger than 150 km/s. Our observations were taken using the Mitchell Spectrograph (formerly VIRUS-P), a…

Astrophysics of Galaxies · Physics 2015-06-19 Sudhir Raskutti , Jenny Greene , Jeremy Murphy

The Milky Way has distinct structural stellar components linked to its formation and subsequent evolution, but disentangling them is nontrivial. With the recent availability of high-quality data for a large numbers of stars in the Milky…

Astrophysics of Galaxies · Physics 2023-07-05 Amalie Stokholm , Víctor Aguirre Børsen-Koch , Dennis Stello , Marc Hon , Claudia Reyes

We introduce the `Illustris zoom simulation project', which allows the study of selected galaxies forming in the $\Lambda$CDM cosmology with a 40 times better mass resolution than in the parent large-scale hydrodynamical Illustris…

Astrophysics of Galaxies · Physics 2016-08-01 Martin Sparre , Volker Springel

We present results on the interstellar medium (ISM) properties of 29 galaxies based on a comparison of {\it Spitzer} far-infrared and Westerbork Synthesis Radio Telescope radio continuum imagery. Of these 29 galaxies, 18 are close enough to…

Astrophysics · Physics 2008-02-19 E. J. Murphy , G. Helou , J. D. P. Kenney , L. Armus , R. Braun

High-mass stars, born in massive dense cores (MDCs), profoundly impact the cosmic ecosystem through feedback processes and metal enrichment, yet little is known about how MDCs assemble and transfer mass across scales to form high-mass young…

We present a two-dimensional kinematic analysis for a sample of simulated binary disc merger remnants with mass ratios 1:1 and 3:1. For the progenitor discs we used pure stellar models as well as models with 10% of their mass in gas. A…

Astrophysics · Physics 2008-11-26 Roland Jesseit , Thorsten Naab , Reynier Peletier , Andreas Burkert

We have identified two channels for the formation of compact dwarf galaxies in the Illustris simulation by reconstructing mass and distance histories of candidates located in the vicinity of the simulation's most massive cluster galaxies.…

Astrophysics of Galaxies · Physics 2017-06-14 Nemanja Martinović , Miroslav Micic

A fundamental feature of galaxies is their structure, yet we are just now understanding the evolution of structural properties in quantitative ways. As such, we explore the quantitative non-parametric structural evolution of 16,778 galaxies…

Astrophysics of Galaxies · Physics 2021-10-13 A. Whitney , L. Ferreira , C. J. Conselice , K. Duncan

[Abridged] Typical disc galaxies forming in a LambdaCDM cosmology encounter a violent environment, where they often experience mergers with massive satellites. The fact that disc galaxies are ubiquitous in the local Universe suggests that a…

Astrophysics of Galaxies · Physics 2017-11-15 Andreea S. Font , Ian G. McCarthy , Amandine M. C. Le Brun , Robert A. Crain , Lee S. Kelvin

As part of a larger program to identify and characterize possible low-redshift analogs to massive compact red galaxies found at high redshift, we have examined the morphologies of three low-redshift compact galaxies drawn from the sample of…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Hsin-Yi Shih , Alan Stockton

The innermost regions of most galaxies are characterised by the presence of extremely dense nuclear star clusters. Nevertheless, these clusters are not the only stellar component present in galactic nuclei, where larger stellar structures…

We present results concerning the internal structure and kinematics of disk galaxies formed in cosmologically motivated simulations. The calculations include dark matter, gas dynamics, radiative cooling, star formation, supernova feedback…

Astrophysics · Physics 2015-06-24 Matthias Steinmetz , Ewald Mueller

We analyze the properties of the circumgalactic gas (CGM) around 120 galaxies with stellar and dark matter halo masses similar to that of the Milky Way. We focus on the morphology and kinematics of the neutral hydrogen and how this depends…

Astrophysics of Galaxies · Physics 2016-08-24 Guinevere Kauffmann , Sanchayeeta Borthakur , Dylan Nelson

Understanding galaxy evolution is key to explaining the structures we observe in the present-day Universe. Counterrotating stellar disks (CRDs), i.e. co-spatial stellar disks rotating with opposite angular momentum, have been proposed as…

Astrophysics of Galaxies · Physics 2026-03-04 M. C. Bugueño , Facundo A. Gómez , Arianna Dolfi , Patricia B. Tissera

Context. Recent studies have suggested that moving groups have a dynamic or "resonant" origin. Under this hypothesis, these kinematic structures become a powerful tool for studying the large-scale structure and dynamics of the Milky Way.…

Astrophysics · Physics 2009-11-13 T. Antoja , F. Figueras , D. Fernandez , J. Torra

Stellar population and stellar kinematic studies provide unique but complementary insights into how galaxies build-up their stellar mass and angular momentum. A galaxy's mean stellar age reveals when stars were formed, but provides little…

We have performed N-body simulations of poor clusters with enough particles to resolve the individual galaxies. The main cases of initial conditions are: (i) 50 equal mass galaxies; (ii) 60 galaxies with masses drawn from a Schechter…

Astrophysics · Physics 2007-05-23 Gastao B. Lima Neto , Frank W. Baier

The last seven years have seen an explosion in the number of Integral Field galaxy surveys, obtaining resolved 2D spectroscopy, especially at high-redshift. These have taken advantage of the mature capabilities of 8-10 m class telescopes…

Cosmology and Nongalactic Astrophysics · Physics 2014-06-10 Karl Glazebrook

We examine the spatial distribution of star clusters in NGC 628 using the statistical tool INDICATE to quantify clustering tendencies. Our sample, based on HST and JWST observations, is the most complete to date, spanning ages from 1 Myr to…