Validating a dark galaxy

Details Validating a dark galaxy Validating a dark galaxy

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10562d&link_type=abstract

HST Proposal ID #10562

Physics

Hst Proposal Id #10562 Galaxies

Scientific paper

VIRGOHI21 is an object detected in the Virgo Cluster HI survey of Davies et al {2004}, with a velocity width typical of a disc galaxy {220 km/s} but which does not appear to have an optical counterpart down to a surface brightness level of 27.5 B mag/sq. arcsec. Altogether, it is the best ever candidate for a Dark Galaxy. We propose to image this object with the ACS through the F814W filter for 9 orbits to see if this object contains a population of individually very faint stars which would be missed by ground-based telescopes.

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