The Arecibo Galaxy Environment Survey VI : The Virgo Cluster (II)
  We present 21 cm observations of a 5 x degree region in the Virgo cluster,
obtained as part of the Arecibo Galaxy Environment Survey. 13 cluster members
are detected, together with 36 objects in the background. We compare and
contrast the results from this area with a larger 10 x degree region. We
combine the two data sets to produce an HI mass function, which shows a higher
detection rate at low masses (but finds fewer massive galaxies) than less
sensitive wider-area surveys, such as ALFALFA. We find that the HI-detected
galaxies are distributed differently to the non-detections, both spatially and
in velocity, providing further evidence that the cluster is still assembling.
We use the Tully-Fisher relation to examine the possibility of morphological
evolution. We find that highly deficient galaxies, as well as some early-type
galaxies, have much lower velocity widths than the Tully-Fisher relation
predicts, indicating gas loss via ram pressure stripping. We also find that HI
detections without optical counterparts do not fit the predictions of the
baryonic Tully-Fisher relation, implying that they are not primordial objects.
