Virgo Early-Type Dwarfs in ALFALFA

Details Virgo Early-Type Dwarfs in ALFALFA Virgo Early-Type Dwarfs in ALFALFA

2007-07-22

arxiv.org/abs/0707.3275v1

Astronomy and Astrophysics

Astrophysics

2 pages. To be published in proceedings of IAU Symposium 244: 'Dark Galaxies and Lost Baryons', J. I. Davies & M. D. Disney. e

Scientific paper

10.1017/S1743921307014299

Early-type dwarf galaxies dominate cluster populations, but their formation and evolutionary histories are poorly understood. The ALFALFA (Arecibo Legacy Fast ALFA) survey has completed observations of the Virgo Cluster in the declination range of 6 - 16 degrees. Less than 2% of the early-type dwarf population is detected, a significantly lower fraction than reported in previous papers based on more limited samples. In contrast ~30 of the irregular/BCD dwarf population is detected. The detected early-type galaxies tend to be located in the outer regions of the cluster, with a concentration in the direction of the M Cloud. Many show evidence for ongoing/recent star formation. Galaxies such as these may be undergoing morphological transition due to cluster environmental effects.

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