First Results from HeCS: the Hectospec Cluster Survey

Details First Results from HeCS: the Hectospec Cluster Survey First Results from HeCS: the Hectospec Cluster Survey

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330405r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #304.05; Bulletin of the American Astronomical Society, Vol. 41, p.274

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We describe the first results from a new survey of clusters and their infall regions at moderate redshift. The Hectospec multifiber spectrograph on the MMT is an ideal instrument for such a program. We obtained spectra for X-ray selected clusters at z=0.15-0.30. We restrict the sample to clusters within the SDSS DR6 imaging footprint to ensure uniform photometry. Early results show that our observing strategy yields a large number of cluster members throughout the cluster infall regions. HeCS will significantly improve our understanding of cluster infall regions and their evolution. HeCS also offers fresh insights into the evolution of galaxies in clusters. Finally, HeCS should soon yield improved cosmological constraints by extending the cluster mass function to larger masses.

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