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