Characterizing the mJy Point Source Population at 1 cm

Details Characterizing the mJy Point Source Population at 1 cm Characterizing the mJy Point Source Population at 1 cm

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21111006w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #110.06; Bulletin of the American Astronomical Society, Vol. 39, p.939

Astronomy and Astrophysics

Astronomy

Scientific paper

We observe 1822 NVSS point sources with the GBT and Caltech Continuum Backend (CCB) at 31.25 GHz. We find the GBT+CCB provides 0.500 mJy rms sensitivity and a 28" FWHM beam in a 3.5 GHz band centered on 31.25 GHz. We combine this data with observations of 2225 point sources by the OVRO 40m (rms sensitivity 2.5 mJy) to provide the most deepest characterization of the point source poulation at 1 cm wavelengths. Our measurements extend direct knowledge of the source counts at 1 cm to 2.5 mJy, a factor of more than 4 below previous estimates. We use Monte Carlo Markov Chains to further estimate the 20 cm to 1 cm spectral index distribution, with an accuracy of 10%, and can model the 1 cm source population down to 1 mJy. Point sources are the most significant contaminant of arcminte scale CMB measurements at 1 cm, and these measurements enable the most accurate calculation of their contribution to this signal.

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