32GHz point source observations for decontaminating CBI2 CMB and SZE cluster fields - 2

Details 32GHz point source observations for decontaminating CBI2 CMB and SZE cluster fields - 2 32GHz point source observations for decontaminating CBI2 CMB and SZE cluster fields - 2

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1600t&link_type=abstract

ATNF proposal C1767, Semester: April, 2008

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Extragalactic, Atca

Scientific paper

We are proposing to measure the fluxes at ~32 GHz of the radio sources in fields being observed by the upgraded Cosmic Background Imager experiment (CBI2) for both Sunyaev-Zeldovich and primordial CMB power spectrum observations. CBI2 is an interferometer, sited at the Chajnantor Observatory in northern Chile, which is optimised for high brightness-sensitivity observations at 26 -- 36 GHz on angular scales of 8-30 arcmin. These observations are however vulnerable to contamination by radio point sources, which presently have to be removed on the basis of positions (but not fluxes) obtained from low-frequency catalogues, with consequent significant loss of signal-to-noise. The ATCA 7 mm system provides the opportunity to measure accurate fluxes in the correct band for sources in the CBI2 fields, removing this source of uncertainty and significantly improving the value of these observations. No other facility can provide sufficiently high flux sensitivity in this frequency band, and covering the equatorial/southern fields accessible to CBI2. In the last semester we were awarded time to observe a subset of our cluster sample and CMB field. These observations were very successful and we are currently preparing our first ATCA source-subtracted cluster results for publication.

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