First Results from an HST/ACS Snapshot Survey of Intermediate Redshift, Intermediate X-ray Luminosity Clusters of Galaxies: Early Type Galaxies and Weak Lensing

Details First Results from an HST/ACS Snapshot Survey of Intermediate Redshift, Intermediate X-ray Luminosity Clusters of Galaxies: Early Type Galaxies and Weak Lensing First Results from an HST/ACS Snapshot Survey of Intermediate Redshift, Intermediate X-ray Luminosity Clusters of Galaxies: Early Type Galaxies and Weak Lensing

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7701t&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.01; Bulletin of the American Astronomical Society, V

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We present first results from our HST/ACS Snapshot survey of clusters randomly selected from a complete X-ray survey, the 160 Square Degree Survey (Vikhlinin et al. 1998; Mullis et al. 2003). We have catalogued and classified over 5,000 galaxies in 25 fields around X-ray clusters of low to moderate X-ray luminosities (Lx = 1043-1044 erg s-1) and spectroscopic redshifts between 0.3-0.6. We present the morphological properties of the early-type galaxies, with particular emphasis on the concentration index. We compare the concentration parameter of the early-type galaxies with those of early-type galaxies in the field at similar redshift, and with those of early-type galaxies in more massive and luminous clusters, also at similar redshifts. We find that early type galaxies in clusters may be more concentrated than early type galaxies in the field. We discuss preliminary results in our comparisons with broader samples, and we take a first look at ground-based color information obtained with the SOAR Optical Imager. We also present the first estimates of shear-based mass estimates for these clusters, derived entirely from the ACS images. This work was supported by STScI/HST GO Cycle 13 and 14 grants.

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