ASPCS
 
Back to Volume
Paper: The Evolution of H I Disks in the Virgo Cluster
Volume: 396, Formation and Evolution of Galaxy Disks
Page: 127
Authors: Chung, A.; van Gorkom, J.H.; Kenney, J.; Crowl, H.; Vollmer, B.; Schiminovich, D.
Abstract: We present the result of a new VLA H I imaging survey of Virgo galaxies, VIVA (VLA Imaging of Virgo in Atomic gas). The goal is to investigate the influence of the cluster on H I gas disks in different density regions. In order to sample various processes at work, we have carefully selected 48 spirals and 5 dwarfs/irregulars showing a range of star formation properties throughout the cluster. Overall, we confirm that galaxies near the cluster core (dM87 < 0.5 Mpc) are severely H I stripped while gas rich galaxies with extended H I disks are always found in the cluster outskirts (dM87 > 1.0Mpc). At intermediate distances from the cluster center however, our high resolution, high sensitivity H I data have revealed a range of H I features that are likely to represent different stripping stages through various effects. In particular, we find evidence for H I stripping due to the surrounding cluster gas even at the distances where the approximated intra-cluster medium (ICM) density is not high enough to affect galaxies. It appears that in some cases a dynamic ICM or a combination of tidal forces and ram-pressure are responsible for gas stripping at those locations. The survey result clearly shows that the impact of the cluster reaches quite far out from the cluster center.
Back to Volume