Results 41 to 50 of about 948,048 (332)

Theoretical Challenges in Galaxy Formation [PDF]

, 2016
Numerical simulations have become a major tool for understanding galaxy formation and evolution. Over the decades the field has made significant progress.
T. Naab, J. Ostriker
semanticscholar   +1 more source

Abundance Ratios in Dwarf Elliptical Galaxies [PDF]

Proceedings of the International Astronomical Union, 2016
AbstractThe aim of this study is to determine abundance ratios and star formation histories (SFH) of dwarf ellipticals in the nearby Virgo cluster. We perform a stellar population analysis of 39 dEs and study them using index-index and scaling relations. We find an unusual behaviour where [Na/Fe] is under-abundant w.r.t.
Sen, Seyda, Peletier, Reynier F., Toloba, Elisa, Mentz, Jaco J.   +3 more
openaire   +4 more sources

The Origin of the Nuclear Star-forming Ring in NGC 3182

The Astronomical Journal, 2023
We investigate the stellar and ionized gas kinematics, and stellar populations of NGC 3182 galaxy using integral field spectrograph data from the Calar Alto Legacy Integral Field Area survey. We try to clarify the nature of the ring structure in NGC 3182.
Mina Pak, Joon Hyeop Lee, Hyunjin Jeong, Woong-Seob Jeong   +3 more
doaj   +1 more source

Dwarf galaxy populations in present-day galaxy clusters – I. Abundances and red fractions [PDF]

, 2011
We compare the galaxy population in the Virgo, Fornax, Coma and Perseus cluster to a state-of-the-art semi-analytic model, focusing on the regime of dwarf galaxies with luminosities from approximately 108 to 109 L⊙.
Simone M. Weinmann, T. Lisker, Q. Guo, H. T. Meyer, J. Janz   +4 more
semanticscholar   +1 more source

Abundance of Substructure in Clusters of Galaxies

The Astrophysical Journal, 2004
It is widely recognized that cold dark matter models predict abundant dark matter substructure in halos of all sizes. Galaxy-galaxy lensing provides a unique opportunity to directly measure the presence and the mass of such substructures in clusters of galaxies.
Natarajan, Priyamvada, Springel, Volker
openaire   +2 more sources

The Chemodynamics of the Stellar Populations in M31 from APOGEE Integrated-light Spectroscopy

The Astrophysical Journal, 2023
We present an analysis of nearly 1000 near-infrared, integrated-light spectra from APOGEE in the inner ∼7 kpc of M31. We utilize full-spectrum fitting with A-LIST simple stellar population spectral templates that represent a population of stars with the ...
Benjamin J. Gibson, Gail Zasowski, Anil Seth, Aishwarya Ashok, Kameron Goold, Tobin Wainer, Sten Hasselquist, Jon Holtzman, Julie Imig, Dmitry Bizyaev, Steven R. Majewski   +10 more
doaj   +1 more source

Stellar Abundances in Local Group Galaxies [PDF]

Highlights of Astronomy, 2005
AbstractHere we describe some of our latest results from measuring detailed abundances in Local Group dwarf galaxies with the VLT. Combining spectroscopic abundances with Color-Magnitude diagrams allows the effective measurement of detailed chemical evolution with time in these galaxies.
Tolstoy, Eline, Venn, Kim
openaire   +2 more sources

Multi-Element Abundance Measurements from Medium-Resolution Spectra. II. Catalog of Stars in Milky Way Dwarf Satellite Galaxies [PDF]

, 2010
We present a catalog of Fe, Mg, Si, Ca, and Ti abundances for 2961 red giant stars that are likely members of eight dwarf satellite galaxies of the Milky Way (MW): Sculptor, Fornax, Leo I, Sextans, Leo II, Canes Venatici I, Ursa Minor, and Draco. For the
Adelman-McCarthy, An, Bell, Bell, Bellazzini, Bellazzini, Binney, Carretta, Castelli, Castelli, Chonis, Christopher Sneden, Clem, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Constance M. Rockosi, Da Costa, Demarque, Evan N. Kirby, Ferraro, Font, Frebel, Fulbright, Fulbright, Geisler, Gratton, Gray, Guhathakurta, Gustafsson, Gustafsson, Irwin, Ivans, Johnson, Joshua D. Simon, Judith G. Cohen, Kirby, Kirby, Kirby, Kirby, Kirby, Koch, Kuehn, Kurucz, Kurucz, Lai, Lai, Lee, Majewski, Majewski, Markwardt, Marla C. Geha, Martin, Michael Siegel, Mighell, Norris, Pietrzyński, Pritzl, Puragra Guhathakurta, Ramírez, Ramírez, Robertson, Roederer, Sadakane, Sangmo Tony Sohn, Sbordone, Sbordone, Schlegel, Shetrone, Shetrone, Shetrone, Shetrone, Siegel, Siegel, Simon, Simon, Sneden, Sneden, Sneden, Sohn, Spite, Steven R. Majewski, Thévenin, Venn, Webbink, Westfall, White, Zacharias, Zucker   +93 more
core   +3 more sources

ON THE SURVIVAL AND ABUNDANCE OF DISK-DOMINATED GALAXIES [PDF]

The Astrophysical Journal, 2009
We study the formation of disk-dominated galaxies in a Lambda CDM universe. Their existence is considered to be a challenge for the Lambda CDM cosmology, because galaxy mergers isotropize stellar disks and trigger angular momentum transport in gas disks, thus fostering the formation of central stellar spheroids. Here, we postulate that the formation of
Koda, Jun, Milosavljevic, Milos, Shapiro, Paul R.   +2 more
openaire   +4 more sources

Photometric Objects Around Cosmic Webs (PAC) Delineated in a Spectroscopic Survey. IV. High-precision Constraints on the Evolution of the Stellar–Halo Mass Relation at Redshift z < 0.7

The Astrophysical Journal, 2023
Taking advantage of the Photometric objects Around Cosmic webs method developed in Paper I, we measure the excess surface density ${\bar{n}}_{2}{w}_{{\rm{p}}}$ of the photometric objects around spectroscopic objects down to stellar masses 10 ^8.0 M _ ...
Kun Xu, Y. P. Jing, Yun Zheng, Hongyu Gao   +3 more
doaj   +1 more source