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Title:
Formation Histories of Dwarf Galaxies in the Local Group
Authors:
Ricotti, Massimo; Gnedin, Nickolay Y.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CM3 0HA, England ), AB(CASA, University of Colorado, Boulder, CO 80309 )
Publication:
The Astrophysical Journal, Volume 629, Issue 1, pp. 259-267. (ApJ Homepage)
Publication Date:
08/2005
Origin:
UCP
Astronomy Keywords:
Cosmology: Theory, Galaxies: Dwarf, Galaxies: Formation, Galaxies: Local Group, Stars: Formation
DOI:
10.1086/431415
Bibliographic Code:
2005ApJ...629..259R

Abstract

We compare the properties of dwarf galaxies in the Local Group with the simulated galaxies formed before reionization in a cosmological simulation of unprecedented spatial and mass resolution, including radiative feedback effects. We find that a subset of the Local Group dwarfs are already remarkably similar to the simulated dwarf galaxies in all their properties before reionization. On the basis of this similarity, we propose the hypothesis that Local Group dwarfs form in a variety of ways: some of them are ``true fossils'' of the pre-reionization era, some of them form most of their stars later, after reionization (we call them ``survivors'' of the reionization era), and the rest of them form an intermediate group of ``polluted fossils.'' We also identify a simple observational test that is able to test our hypothesis.
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