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A. Chung (Columbia University)
Galaxies in dense environments differ from the ones in the field in their morphological mix, stellar populations and gas content. Many effects have been suggested to be responsible for those differences, but we still lack indepth studies of individual galaxies. Virgo, as the nearest example of a dynamically young cluster, is an ideal place for such studies. We performed a VLA survey in HI of 50 carefully selected galaxies and combined these with H\alpha imaging and GALEX data. The selected galaxies are spread throughout the cluster, from near the dense core region to low density outskirts in Virgo. We used the HI morphology and kinematics to constrain the mechanisms at work. The HI study clearly shows that the galaxies located within 0.5 Mpc from M87 have been ram-pressure stripped by the hot intra-cluster medium (ICM). Beyond this radius however, the gas content and morphology dramatically change. We see evidence for a number of HI tails pointing away from the cluster center. We will discuss whether this is due to gravitational effects or ICM-ISM interaction. We will also show some examples of how H\alpha and NUV/FUV can be used for further constraints.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.