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Low luminosity and ultra low surface brightness galaxies in the Virgo cluster

Published online by Cambridge University Press:  08 November 2005

Nelson Caldwell
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA, USA email: caldwell@cfa.harvard.edu
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Abstract

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A CCD survey of selected areas in the Virgo cluster was undertaken with the goal of finding dwarf ellipticals fainter in surface brightness than known in the Local Group. This was successful, and galaxies as much as 2 magnitudes fainter than e.g., Umi, have been found. These tend to be larger in radius, due to the detection methods, and thus more luminous than the LG as well. Two fields containing such galaxies were imaged with ACS/HST, with the result that individual RGB stars have been resolved in these galaxies, which are 15 Mpc distant.

Type
Contributed Papers
Copyright
© 2005 International Astronomical Union