XMM-Newton observation of a dark matter galaxy in the Virgo cluster

Details XMM-Newton observation of a dark matter galaxy in the Virgo cluster XMM-Newton observation of a dark matter galaxy in the Virgo cluster

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..127b&link_type=abstract

XMM-Newton Proposal ID #05033401

Physics

Galaxies, Galactic Surveys, Virgo Hi21, Xmm-Newton Proposal 05033401

Scientific paper

A recent HI survey of the Virgo cluster detected several isolated HI clouds. One of these, VIRGOHI21, shows clear evidence of rotation in its HI spectrum: the HI mass, the total mass and the approximate size are all typical for normal luminous 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. VIRGOHI21 appears to be the first detection of a population of dark matter halos, or `dark galaxies, often predicted by theory but whose detection has so far been elusive. XMM-Newton is the observatory of choice to test for the presence of diffuse X-ray emission associated with this unique dark galactic halo.

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