Volume 482, Number 1, April IV 2008
|Page(s)||43 - 52|
|Published online||14 February 2008|
HI content and other structural properties of galaxies in the Virgo cluster from the Arecibo Legacy Fast ALFA Survey
Universita degli Studi di Milano-Bicocca, Piazza delle Scienze 3, 20126 Milano, Italy e-mail: email@example.com
2 Center for Radiophysics and Space Research and National Astronomy and Ionosphere Center, Cornell University, Ithaca, NY 14853, USA
3 Dept. of Physics & Astronomy. Union College. Schenectady, NY 12308, USA
4 The Wise Observatory and The Raymond & Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Israel
5 Hugel Science Center, Lafayette College, Easton, PA 18042, USA
6 Astronomy Dept. Wesleyan University, Middletown, CT 06457, USA
7 Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille, France
Accepted: 25 January 2008
We report the results of an HI blind survey of 80 deg2 of the Virgo cluster, based on the 08° 16° strip of ALFALFA, the Arecibo Legacy Fast ALFA Survey. 187 HI sources of high significance are found providing a complete census of HI sources in this region of the Virgo cluster ( km s-1) with . 156/187 (83%) sources are identified with optical galaxies from the Virgo Cluster Catalogue (Binggeli et al. 1985, AJ, 90, 1681), all but 8 with late-type galaxies. Ten sources are not associated with optical galaxies and were found to correspond to tidally-disrupted systems (see Kent et al. 2007, ApJ, 665, L15; and Haynes et al. 2007, ApJ, 665, L19). The remaining 21 (11%) are associated with galaxies that are not listed in the Virgo Cluster Catalogue. For all sources with an optical counterpart in the Sloan Digital Sky Survey, we analyzed i-band SDSS plates to measure optical structural parameters. We find that in the Virgo cluster: i) HI inhabits galaxies that are structurally similar to ordinary late-type galaxies; ii) their HI content can be predicted from their optical luminosity; iii) low surface brightness galaxies have low optical luminosity and contain small quantities of neutral hydrogen; iv) low surface brightness, massive Malin1 type galaxies are comfortably rare objects (less than 0.5%); v) there are no “dark-galaxies” with HI masses ; vi) less than 1% of early-type galaxies contain neutral hydrogen with (di Serego Alighieri et al. 2007, A&A, 474, 851).
Key words: galaxies: clusters: individual: Virgo / galaxies: evolution / galaxies: ISM / galaxies: fundamental parameters
© ESO, 2008
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