RADIO SOURCES FROM A 31 GHz SKY SURVEY WITH THE SUNYAEV-ZEL'DOVICH ARRAY

Journal Article · Thu Jun 10 04:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/716/1/521· OSTI ID:21451128

Muchovej, Stephen; Hawkins, David; Lamb, James; Woody, David ^[1]; Leitch, Erik; Carlstrom, John E; Culverhouse, Thomas; Greer, Chris; Hennessy, Ryan; Loh, Michael; Marrone, Daniel P; Pryke, Clem; Sharp, Matthew ^[2]; Joy, Marshall ^[3]; Miller, Amber ^[4]; Mroczkowski, Tony ^[5]

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1. California Institute of Technology, Owens Valley Radio Observatory, Big Pine, CA 93513 (United States)
2. Department of Astronomy and Astrophysics, Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States)
3. Space Sciences-VP62, NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States)
4. Columbia Astrophysics Laboratory, Department of Physics, Columbia University, New York, NY (United States)
5. Department of Astronomy, Columbia University, New York, NY 10027 (United States)

We present the first sample of 31 GHz selected sources to flux levels of 1 mJy. From late 2005 to mid-2007, the Sunyaev-Zel'dovich Array observed 7.7 deg{sup 2} of the sky at 31 GHz to a median rms of 0.18 mJy beam{sup -1}. We identify 209 sources at greater than 5{sigma} significance in the 31 GHz maps, ranging in flux from 0.7 mJy to {approx}200 mJy. Archival NVSS data at 1.4 GHz and observations at 5 GHz with the Very Large Array are used to characterize the sources. We determine the maximum-likelihood integrated source count to be N(>S) = (27.2 {+-} 2.5)deg{sup -2} x (S {sub mJy}){sup -1.18{+-}0.12} over the flux range 0.7-15 mJy. This result is significantly higher than predictions based on 1.4 GHz selected samples, a discrepancy which can be explained by a small shift in the spectral index distribution for faint 1.4 GHz sources. From comparison with previous measurements of sources within the central arcminute of massive clusters, we derive an overdensity of 6.8 {+-} 4.4, relative to field sources.

• OSTI ID: 21451128
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 716; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BACKGROUND RADIATION
CATALOGS
COSMOLOGY
DISTRIBUTION
DOCUMENT TYPES
MATHEMATICAL SOLUTIONS
MAXIMUM-LIKELIHOOD FIT
NUMERICAL SOLUTION
RADIATIONS