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HI Clouds Detected Toward Virgo with the Arecibo Legacy Fast ALFA Survey

Published online by Cambridge University Press:  01 June 2007

Brian R. Kent
Brian R. Kent*
Affiliation:
Center for Radiophysics and Space Research, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA email: [email protected]
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Abstract

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The Arecibo Legacy Fast ALFA survey is in the process of yielding a complete HI dataset of the Virgo Cluster and its environs (Giovanelli et al. 2007, Kent et al., in preparation). Assuming a distance to Virgo of 16.7 Mpc, the minimum detectable HI mass by ALFALFA is of order 2 × 107 M⊙. A number of the HI detections appear to have interesting properties. Some appear associated with, but offset from, low surface brightness optical counterparts; others, at larger spatial offsets, may be tidally related to optical counterparts. Yet another class includes detections which are not identifiable with any optical counterparts. We present the ALFALFA results on these objects in the Virgo region, as well as followup aperture synthesis observations obtained with the VLA.

Keywords

galaxies:distances and redshiftsgalaxies:evolutiongalaxies: formationradio lines: galaxiesgalaxies:halosindividual:Virgo clustergalaxies:clustersgalaxies:interactions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 93 - 102
Copyright
Copyright © International Astronomical Union 2008

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