XMM-Newton observation of the invisible galaxy VIRGOHI21

Details XMM-Newton observation of the invisible galaxy VIRGOHI21 XMM-Newton observation of the invisible galaxy VIRGOHI21

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..131p&link_type=abstract

XMM-Newton Proposal ID #04033501

Physics

Galaxies, Galactic Surveys, Virgohi21, Xmm-Newton Proposal 04033501

Scientific paper

An HI survey of the Virgo cluster recently detected several isolated HI clouds. One, VIRGOHI21, shows clear evidence of rotation in its HI spectrum (Davies et al. 2004): the HI mass, the total estimated mass, and the approximate size are all typical for galaxies. According to the Tully-Fischer relation, the galaxy should be of 12th mag in V; yet deep optical follow-up observations reveal a limit of 27.5 B mag arcsec**(-2), consistent with the sky background. VHI21 appears to be the first detection of a population of 'dark' galaxies often predicted by theory but whose detection had so far been elusive. An XMM-Newton observation is therefore essential to understand if VHI21 has the X-ray properties of 'normal' galaxies or if its 'dark' nature has implications for the X-ray emission.

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