NOAO >   Observing Info >   Approved Programs >   2003B-0307

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Proposal Information for 2003B-0307


PI: Kyle Dawson, UC Berkeley, kdawson@cosmology.berkeley.edu
Address: Physics Department, 366 LeConte Hall, Berkeley, CA 94720, USA

CoI: William Holzapfel, UC Berkeley
CoI: John Carlstrom, University of Chicago

Title: Identifying Galaxy Clusters in the BIMA CMB Anisotropy Survey

Abstract: For the past several years, the Berkeley-Illinois-Maryland Association (BIMA) array has been used with cm wave receivers to conduct a survey of 18 independent fields not known to contain galaxy clusters in order to place limits on secondary CMB anisotropy. Over 1000 hours of observation have resulted in a significant detection of excess power in the visibility data. The Sunyaev-Zel'dovich (SZ) effect is believed to be the most likely candidate for the signal detected in the BIMA fields. However, independent observations with an optical telescope are required in order to confirm that the signal is indeed caused by clusters of galaxies. Multiband imaging with the KPNO 4 meter telescope will allow us to correlate color overdensities with microwave decrements suspected to be caused by the SZ effect. Correlating the two independent observations should produce a sensitivity to low mass clusters that would not otherwise be identified in a single measurement. With these KPNO observations, we hope to confirm the first SZ discovery of galaxy clusters.


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 >   2003B-0307

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