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...
متن کاملOn the formation of dwarf galaxies and stellar halos
Using analytic arguments and a suite of very high resolution (∼ 10 M⊙ per particle) cosmological hydro-dynamical simulations, we argue that high redshift, z ∼ 10, M ∼ 10 M⊙ halos, form the smallest ‘baryonic building block’ (BBB) for galaxy formation. These halos are just massive enough to efficiently form stars through atomic line cooling and to hold onto their gas in the presence of supernova...
متن کاملGiant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies
We present a discovery of a giant stellar halo in NGC 6822, a dwarf irregular galaxy in the Local Group. This halo is mostly made of old red giants, showing striking features: 1) it is several times larger than the main body of the galaxy seen in the optical images, and 2) it is elongated in the direction almost perpendicular to the HI disk of NGC 6822. The structure of this stellar halo looks ...
متن کاملar X iv : a st ro - p h / 96 06 10 7 v 1 1 8 Ju n 19 96 Dwarf Galaxies Also Have Stellar Halos
We present evidence for the existence of an old stellar halo in the dwarf irregular galaxy WLM, an isolated member of the Local Group. The halo consists of population-II stars, with low metallicities and age ≥ 10yr. The finding of a halo in a dwarf irregular galaxy argues for a generic mode of galaxy formation that requires a halo in the presence of a disk, regardless of galaxy size. This impli...
متن کاملSatellites and Halos of Dwarf Galaxies
We study the abundance of satellite galaxies as a function of primary stellar mass using the SDSS/DR7 spectroscopic catalogue. In contrast with previous studies, which focussed mainly on bright primaries, our central galaxies span a wide range of stellar mass, 10 6 M ∗ /M⊙ 6 10 , from dwarfs to central cluster galaxies. Our analysis confirms that the average number of satellites around bright p...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1996
ISSN: 0004-637X
DOI: 10.1086/310189