Spectroscopy of Galaxies in Massive SPT Clusters

Details Spectroscopy of Galaxies in Massive SPT Clusters Spectroscopy of Galaxies in Massive SPT Clusters

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933817r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #338.17

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We are in the first year of an NOAO survey program that will yield GMOS-S multi-object spectroscopy of 85 galaxy clusters from the South Pole Telescope (SPT) survey sample, up to a redshift of 0.8. These clusters were selected in mm-wave maps from their Sunyaev-Zeldovich-effect (SZE) signature which is almost independent of the cluster redshift, so that these clusters are the most massive in their part of the sky. Our main goal is to use velocity dispersions, a complementary observable to the gas-based SZE mass proxy, to calibrate the SZE masses and thus improve the constraints on cosmological parameters from the SPT cluster sample. Our spectroscopic sample of around 25 members per cluster will also enable galaxy-property studies, as a legacy data product offered to the community. We present our methodology and first results, as 16 clusters were observed in our first observing season. Funding for this program is provided in part by the NSF.

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