Structure and stellar content of dwarf galaxies
نویسندگان
چکیده
منابع مشابه
Ghostly Stellar Halos in Dwarf Galaxies
Ghostly Stellar Halos in Dwarf Galaxies Hoyoung Kang Department of Physics, University of Maryland Our study aims at probing the typical masses of the smallest and faintest galaxies that have ever formed in the universe. We carry out numerical simulations to characterize the size, stellar mass, and stellar mass surface density of stellar halos as a function of dark matter halo mass and a parame...
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What can we learn from the somewhat arduous study of old stellar populations in nearby galaxies? Unless the nearby universe is subtly anomalous, it should contain a relatively normal selection of galaxies whose histories are representative of field galaxies in general throughout the Universe. We can therefore take advantage of our ability to resolve local galaxies into individual stars to direc...
متن کاملThe Universal Stellar Mass–stellar Metallicity Relation for Dwarf Galaxies
We present spectroscopic metallicities of individual stars in seven gas-rich dwarf irregular galaxies (dIrrs), and we show that dIrrs obey the same mass–metallicity relation as the dwarf spheroidal (dSph) satellites of both the Milky Way and M31: Z∗ ∝ M 0.30±0.02 ∗ . The uniformity of the relation is in contradiction to previous estimates of metallicity based on photometry. This relationship is...
متن کاملStellar Population Constraints on the Dark Matter Content and Origin of Ultra-Compact Dwarf Galaxies⋆
We analyse intermediate-resolution VLT FLAMES/Giraffe spectra of six ultracompact dwarf (UCD) galaxies in the Fornax cluster. We obtained velocity dispersions and stellar population properties by full spectral fitting against pegase.hr models. Objects span a large range of metallicities (–0.95 to –0.23 dex), 4 of them are older than 8 Gyr. Comparison of the stellar and dynamical masses suggests...
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We present UBVRI surface photometry for 16 dwarf elliptical galaxies in the Virgo Cluster with previously measured kinematic properties. The global optical colors are red, with median values for the sample of 0.24 ± 0.03 in (U–B), 0.77 ± 0.02 in (B– V), and 1.02 ± 0.03 in (V–I). We recover the well known color-magnitude relation for cluster galaxies, but find no significant difference in domina...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics Supplement Series
سال: 2000
ISSN: 0365-0138,1286-4846
DOI: 10.1051/aas:2000320