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The Arecibo Galaxy Environment Survey V : The Virgo Cluster (I) | | R. Taylor
; J. I. Davies
; R. Auld
; R. F. Minchin
; | | Date: |
14 Mar 2012 | | Abstract: | We present 21 cm observations of a 10 $ imes$ 2 degree region in the Virgo
cluster, obtained as part of the Arecibo Galaxy Environment Survey. 289 sources
are detected over the full redshift range (-2,000 $<$ $v$$_{hel}$ $<$ + 20,000
km/s) with 95 belonging to the cluster ($v$$_{hel}$ $<$ 3,000 km/s). We combine
our observations with data from the optically selected Virgo Cluster Catalogue
(VCC) and the Sloan Digital Sky Survey (SDSS). Most of our detections can be
clearly associated with a unique optical counterpart, and 30% of the cluster
detections are new objects fainter than the VCC optical completeness limit. 7
detections may have no optical counterpart and we discuss the possible origins
of these objects. 7 detections appear associated with early-type galaxies. We
perform HI stacking on the HI-undetected galaxies listed in the VCC in this
region and show that they must have significantly less gas than those actually
detected in HI. Galaxies undetected in HI in the cluster appear to be really
devoid of gas, in contrast to a sample of field galaxies from ALFALFA. | | Source: | arXiv, 1203.3094 | | Services: | Forum | Review | PDF | Favorites | |
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