Astrophysics of Dwarf Galaxies: Structures and Stellar Populations

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General Properties Of Dwarf Galaxies, Irregular Dwarf Galaxies, Origin Of Dwarf Galaxies, Spheroidal Dwarf Galaxies

Scientific paper

The main properties of dwarf galaxies are reviewed, primarily on the basis of optical structures and stellar population characteristics. Morphological distinctions between dwarf and giant galaxies are largely associated with the low central densities of luminous matter in dwarfs, and we investigate the astrophysics of this signature of dwarfs. As dwarfs come in two distinct structural forms, rotating disks in irregulars and dynamically hot spheroids in the dSph/dE family, it is not clear that dwarfs are produced by a single process. Further complications are introduced by results of recent studies showing that structurally similar galaxies have experienced different star formation histories, so it is not clear which factors control evolutionary rates. While we can show that the presence of low mass densities naturally leads to many of the expected features of dI galaxies, the models seem less well-constrained for the spheroidal dwarfs.

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