ALFALFA HI Content and Star Formation in Virgo Cluster Early-Type Dwarfs
Abstract
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.
Keywords
Cite
@article{arxiv.0909.2609,
title = {ALFALFA HI Content and Star Formation in Virgo Cluster Early-Type Dwarfs},
author = {R. A. Koopmann and R. Giovanelli and M. P. Haynes and N. Brosch},
journal= {arXiv preprint arXiv:0909.2609},
year = {2009}
}
Comments
4 pages, 2 figures. To appear in the Proceedings of "Galaxy Wars: Stellar Populations and Star Formation in Interacting Galaxies" Conference, B. Smith, N. Bastian, J. Higdon and S. Higdon eds, in press