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Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10488b&link_type=abstract
HST Proposal ID #10488
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Hst Proposal Id #10488 Galaxies
Scientific paper
We are proposing an HST snapshot survey of 40 objects with velocity dispersion larger than 350 km/s, selected from the Sloan Digital Sky Survey and confirmed to be single massive galaxies by the ACS-HRC i-band imaging obtained during Cycle 13. This sample of the most massive galaxies in the Universe is interesting because these objects potentially harbor the most massive black holes, and because their existence places strong constraints on galaxy formation models. These objects are unusual for another reason than their abnormally large velocity dispersions: they appear to be bluer than expected from extrapolation of the color-velocity dispersion relation of normal early-types to these large velocity dispersions. The bluer than expected colors indicate that the formation histories of these objects are likely to be rather different than for normal early-types. This difference is also expected to manifest as abnormal color-gradients. ACS-HRC imaging in one other band {i.e. the g-band} will allow us not simply to analyze color gradients in these objects but also to study their color texture and topology. This study will provide important information about the formation history of galaxies.
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