NOAO >   Observing Info >   Approved Programs >   2012A-0319

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Proposal Information for 2012A-0319


PI: Thomas Krane, University of Pennsylvania, kranet@sas.upenn.edu
Address: Department of Physics and Astronomy, 209 S. 33rd St., Philadelphia, PA 19104, USA

CoI: Masao Sako, University of Pennsylvania
CoI: John Peterson, Purdue University
CoI: Garrett Jernigan, Space Sciences Laboratory, UC Berkeley

Title: Photometric Imaging and Richness Analysis of High Redshift X-ray Bright Galaxy Clusters

Abstract: We propose to use the NOAO facilities to obtain high-quality photometry for high-redshift galaxy cluster candidates discovered serendipitously from archival Chandra and XMM-Newton data that were not detected by MaxBCG. Our proposed sample consists of 13 previously unidentified, X-ray bright (F_X > 10^-13 \rmergs cm^-2 \rms^- 1) galaxy cluster candidates. Imaging observations of our sample in the SDSS griz bands will allow us to obtain accurate photometric redshifts of the red cluster member galaxies, which will subsequently enable us to determine X-ray luminosities, masses, and optical richness for each cluster. We will determine the optical richness - X-ray luminosity relation for this unconfirmed sample, and compare it with the well-known relation as determined from the MaxBCG sample. The proposed observations will shed new light on whether optically-selected galaxy cluster samples result in biased, incomplete halo detection.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2012A-0319

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