Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21731201t&link_type=abstract
American Astronomical Society, AAS Meeting #217, #312.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
I present results from the neutral hydrogen Arecibo Galaxy Environment Survey (AGES) for two regions in the Virgo Cluster, covering 15 square degrees to a sensitivity of 0.6 mJy/beam. 73 objects are detected within the cluster, with 109 detections in the background. The majority of the cluster detections are associated with galaxies previously identified in the optical Virgo Cluster Catalogue, but nearly 30% of the cluster detections are new objects below the VCC completeness limit.
No definite optically dark galaxies are identified, however 4 intriguing candidates are reported. All have possible optical counterparts but these are extremely faint, and their HI velocity widths appear inconsistent for such objects when compared to the more certain associations. I discuss the likelihood that these are really dark galaxies.
Cluster galaxies are found to be significantly HI deficient but it is not clear where their missing gas has gone. An automated algorithm is described to try to recover faint extended HI features, but no detections are made. I assess whether this implies the cluster environment inhibits the production and survival of such features, or whether it is due to insufficient sensitivity.
A small fraction ( 10%) of the early-type galaxies identified in the VCC are detected in HI. Evidence that some of these are morphologically evolving via gas loss, while others are recent additions to the cluster as yet unaffected by their new environment, is discussed.
This research was funded by the Science and Technology Facilities Council of the U.K.
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