Quantified HI Morphology V: HI Disks in the Virgo Cluster

Authors :: Holwerda, B. W.
Pirzkal, N.
de Blok, W. J. G.
van Driel, W.
Publication Year :: 2011
Publisher :: arXiv, 2011.
Abstract: We explore the quantified morphology of atomic hydrogen (HI) disks in the Virgo cluster. These galaxies display a wealth of phenomena in their Hi morphology, e.g., tails, truncation and warps. These morphological disturbances are related to the ram-pressure stripping and tidal interaction that galaxies undergo in this dense cluster environment. To quantify the morphological transformation of the HI disks, we compute the morphological parameters of CAS, Gini, and M20 and our own GM for 51 galaxies in 48 HI column density maps from the VIVA project. Some morphological phenomena can be identified in this space of relatively low resolution HI data. Truncation of the HI disk can be cleanly identified via the Concentration parameter (C<br />Comment: 10 pages, 3 figures, accepted by MNRAS, appendixes not included