Gas-rich LSB Galaxies -- Progenitors of Blue Compact Dwarfs?

Details Gas-rich LSB Galaxies -- Progenitors of Blue Compact Dwarfs? Gas-rich LSB Galaxies -- Progenitors of Blue Compact Dwarfs?

1998-10-22

arxiv.org/abs/astro-ph/9810338v1

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures. To appear in IAU Colloquium 171: The Low Surface Brightness Universe

Scientific paper

We analyze deep CCD images of nearby Blue Compact Dwarf (BCD) galaxies in an attempt to understand the nature of the progenitors which are hosting the current burst of star formation. In particular, we ask whether BCDs are hosted by normal or low-surface-brightness dI galaxies. We conclude that BCDs are in fact hosted by gas-rich galaxies which populate the extreme high-central-mass-density end of the dwarf galaxy distribution. Such galaxies are predisposed to having numerous strong bursts of star formation in their central regions. In this picture, BCDs can only occur in the minority of dwarf galaxies, rather than being a common phase experienced by all gas-rich dwarfs.

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