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Paper: HI Observations of the Virgo Cluster: Catalog Statistics, Optically Inert Detections, and HI Streams
Volume: 395, Frontiers of Astrophysics: A Celebration of NRAO's 50th Anniversary
Page: 369
Authors: Kent, B.R.
Abstract: The Arecibo Legacy Fast ALFA survey (Giovanelli, R., et al. 2005, AJ, 130, 2598) has yielded a complete HI dataset of the Virgo Cluster and its environs (Kent et al. in preparation, and Giovanelli, R., et al. 2007, AJ, 133, 2569). Several HI candidates have been detected in the vicinity of the Virgo Cluster, all at cz < 3,000 km s−1. Assuming a distance to Virgo of 16.7 Mpc, the minimum detectable HI mass is of order 2×107 M. Some objects appear to be located near low surface brightness optical counterparts, or are the result of tidal interactions with nearby large galaxies. Such detections are clearly the result of a larger group or system. However, other isolated HI detections do not coincide with any nearby counterparts visible in optical surveys (Kent, B.R., et al. 2007, ApJ, 665, L15). The detections lie outside the influence of effects from ram-pressure stripping in the Virgo Cluster. The parameters of these detections and their follow-up observations will be described, as well as the contents of the first Virgo region catalogs released from the survey. The effects of the cluster environment on the formation and evolution of such objects will be corroborated with observed properties.
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