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Radio Point Sources Toward Galaxy Clusters at 30 GHzExtra-galactic point sources are a significant contaminant in cosmic microwave background and Sunyaev-Zel'dovich effect experiments. Deep interferometric observations with the BIMA and OVRO arrays are used to characterize the spatial, spectral, and flux distributions of radio point sources toward galaxy clusters at 28.5 GHz. We compute counts of mJy point source fluxes from 90 fields centered on known massive galaxy clusters and 8 non-cluster fields. Counts in the non-cluster fields are consistent with extrapolations from the results of other surveys. We also compute counts towards clusters as a function of luminosity in three redshift bins out to z = 1.0 and see no clear evidence for evolution with redshift. We compute spectral indices of mJy sources in cluster fields between 1.4 and 28.5 GHz. The distribution is skewed, with a median spectral index of 0.76 and 25th and 75th percentiles of 0.55 and 0.95, respectively. This is steeper than the spectral indices of brighter field point sources measured by other surveys.
Document ID
20060047774
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Coble, K.
(Chicago State Univ. Chicago, IL, United States)
Carlstrom, J. E.
(Adler Planetarium Chicago, IL, United States)
Bonamente, M.
(National Space Science and Technology Center Huntsville, AL, United States)
Dawson, K.
(California Univ. Berkeley, CA, United States)
Holzapfel, W.
(California Univ. Berkeley, CA, United States)
Joy, M.
(National Space Science and Technology Center Huntsville, AL, United States)
LaRoque, S.
(Adler Planetarium Chicago, IL, United States)
Reese, E. D.
(California Univ. Davis, CA, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Other

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