Dwarf Spheroidal Galaxies : Keystones of Galaxy Evolution

Details Dwarf Spheroidal Galaxies : Keystones of Galaxy Evolution Dwarf Spheroidal Galaxies : Keystones of Galaxy Evolution

1994-11-16

arxiv.org/abs/astro-ph/9411067v1

Astronomy and Astrophysics

Astrophysics

41 pages, plain tex (no figures included -- available by snail mail). review to appear in PASP

Scientific paper

Dwarf spheroidal galaxies are the most insignificant extragalactic stellar systems in terms of their visibility, but potentially very significant in terms of their role in the formation and evolution of much more luminous galaxies. We discuss the present observational data and their implications for theories of the formation and evolution of both dwarf and giant galaxies. The putative dark matter content of these low-surface-brightness systems is of particular interest, as is their chemical evolution. Surveys for new dwarf spheroidals hidden behind the stars of our Galaxy and those which are not bound to giant galaxies may give new clues as to the origins of this unique class of galaxy.

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