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| Paper: |
ALFALFA HI Content and Star Formation in Virgo Cluster Early-Type Dwarfs |
| Volume: |
423, Galaxy Wars: Star Formation and Stellar Populations in Interacting Galaxies |
| Page: |
101 |
| Authors: |
Koopmann, R. A.; Giovanelli, R.; Haynes, M. P.; Kent, B.; Brosch, N. |
| Abstract: |
Early-type dwarfs dominate cluster environments, yet their formation and evolutionary histories remain unclear. The ALFALFA (Arecibo Legacy Fast ALFA) blind survey is providing a census of HI in galaxies of all types in a range of environments. Here we report on ALFALFA results for Virgo Cluster early-type dwarfs between declinations of 4 and 16 degrees. Less than 2% of the Virgo early-type dwarf population is detected, compared to 70-80% of the Im/BCD dwarf population. Most of the dwarfs detected in HI show evidence for ongoing or recent star formation. Early-type galaxies with HI tend to be located in the outer regions of the cluster and to be brighter. Early-type dwarfs with HI may be undergoing morphological transition due to cluster environmental effects. |
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