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Virgo Early-Type Dwarfs in ALFALFA

Published online by Cambridge University Press:  01 June 2007

Rebecca A. Koopmann*
Affiliation:
Department of Physics and Astronomy, Union College, Schenectady, NY 12308, email: koopmanr@union.edu National Astronomy and Ionosphere Center†, Space Sciences Building, Cornell University, Ithaca NY 14853
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Abstract

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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

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