TL;DR
This study uses ALFALFA survey data to analyze early-type dwarf galaxies in the Virgo Cluster, revealing low detection rates and signs of ongoing star formation, suggesting environmental influences on their evolution.
Contribution
First large-scale HI survey analysis of Virgo early-type dwarfs, highlighting their low detection rate and potential morphological transformation due to cluster environment.
Findings
Less than 2% of early-type dwarfs detected in HI
Detected early-types are mostly in the outer cluster regions
Many show evidence of recent star formation
Abstract
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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