NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-25 T14:43:19 PDT
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For refcode 2005A&A...437L..19O:
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2005A&A...437L..19O A large H I cloud near the centre of the Virgo cluster T. Oosterloo and J. van Gorkom Received 22 April 2005 / Accepted 18 May 2005 We report the discovery of a large HI cloud in the central regions of the Virgo cluster. It is 110 x 25 kpc in size and contains 3.4 x 10^8^ M_sun_ of HI. The morphology and kinematics of this cloud strongly suggest that it consists of HI removed from the galaxy NGC 4388 by ram-pressure stripping. It is more likely the result of an interaction of the ISM of NGC 4388 with the hot halo of the M 86 group and not with the ICM centred on M 87. The large extent of the plume suggests that gas stripped from cluster galaxies can remain neutral for at least 10^8^ yr. Locally, the column density is well above 10^20^ cm^-2^, suggesting that the intra-cluster HII regions known to exist in Virgo may have formed from gas stripped from cluster galaxies. The existence of the HI plume suggests that stripping of infalling spirals contributes to the enrichment of the ICM. The HI object in the Virgo cluster recently reported by Minchin et al. (2005, ApJ, 622, L21) may have a similar origin and may therefore not be a "dark galaxy". Keywords: intergalactic medium, galaxies: interaction, galaxies: clusters: individual: Virgo cluster, galaxies: individual: NGC 4388
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