Journal Article

High-frequency radio polarization measurements of <i>WMAP</i> point sources

N. Jackson, I. W. A. Browne, R. A. Battye, D. Gabuzda and A. C. Taylor

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 401, issue 2, pages 1388-1398
Published in print January 2010 | ISSN: 0035-8711
Published online January 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15757.x
High-frequency radio polarization measurements of WMAP point sources

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We present polarization measurements at 8.4, 22, and 43 GHz made with the Very Large Array (VLA) of a complete sample of extragalactic sources stronger than 1 Jy in the 5 yr Wilkinson Microwave Anisotropy Probe (WMAP) catalogue and with declinations north of −34°. The observations were motivated by the need to know the polarization properties of radio sources at frequencies of tens of GHz in order to subtract polarized foregrounds for future sensitive cosmic microwave background (CMB) experiments. The total intensity and polarization measurements are generally consistent with comparable VLA calibration measurements for less-variable sources, and within a similar range to WMAP fluxes for unresolved sources. A further paper will present correlations between measured parameters and derive implications for CMB measurements.

Keywords: polarization; galaxies: active; radio continuum: galaxies

Journal Article.  5922 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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