|May21-05, 04:19 PM||#1|
Blog Entries: 9
HI clouds in the center of the Virgo cluster
This paper http://arxiv.org/astro-ph/0505397 reports the discovery of a HI cloud near the center of the Virgo cluster. According to the morphology and kinematics of a plume in a nearby galaxy (NGC 4388), it is assumed that tidal forces or the pressure of the ICM gas have stripped this HI gas from NGC 4388.
At the end of the paper it is also postulated that the reported discovery of a "dark galaxy" (VIRGOHI21) in http://arxiv.org/abs/astro-ph/0502312 might be wrong and that VIRGOHI21 may be also of similar nature than the recently discovered cloud. In that paper it was stated that the absence of nearby clouds as well as the absence of galaxies located close enough to VIRGOHI21 were the reasons to discard tidal interactions as the origin of VIRGOHI21. Therefore, it was assumed that a dark galaxy was found (their existence is predicted by the CDM model of structure formation).
However, in that paper no mention of a possible stripping by ICM gas was made. Is it possible that a mechanism like stripping by ICM gas pressure can produce an isolated cloud with a high rotation velocity (as reported in astro-ph/0502312)? Or shall I assume that the authors of astro-ph/0505397 are expecting new discoveries of HI-clouds near VIRGOHI21 such that the assumption of tidal interactions could make sense?
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