Galaxy evolution and the Local Group

Astronomy and Astrophysics – Astronomy

Scientific paper

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Dwarf Stars, Galactic Evolution, Local Group (Astronomy), Magellanic Clouds, Blue Stars, Spiral Galaxies

Scientific paper

More than half of the known members of the Local Group are either elliptical or dwarf spheroidals. Such galaxies have already converted more than about 99 percent of their baryonic mass into stars. With the exception of the SMC, all of the remaining spiral and elliptical members of the Local Group have converted approximately 90-99 percent of their baryonic mass into stars. If the Local Group is a fair sample of the universe then this suggests that most galaxies are already 'retired' or 'semi-retired'. Only a few percent of all galaxies are still in their star-forming prime. This may explain why blue galaxies are observed to be much more frequent in the recent past than they are at the present time.

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