Journal Article

Wide-field imaging and polarimetry for the biggest and brightest in the 20-GHz southern sky

S. Burke-Spolaor, R. D. Ekers, M. Massardi, T. Murphy, B. Partridge, R. Ricci and E. M. Sadler

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 1, pages 504-517
Published in print May 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14556.x
Wide-field imaging and polarimetry for the biggest and brightest in the 20-GHz southern sky

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We present the wide-field imaging and polarimetry at ν= 20 GHz of seven most extended, bright (Stotal≥ 0.50 Jy), high-frequency selected radio sources in the southern sky with declinations δ < −30°. Accompanying the data are brief reviews of the literature for each source. The results presented here aid in the statistical completeness of the Australia Telescope 20-GHz Survey: the Bright Source Sample. The data are of crucial interest for future cosmic microwave background missions as a collection of information about candidate calibrator sources. We were able to obtain data for seven of the nine sources identified by our selection criteria. We report that Pictor A is thus far the best extragalactic calibrator candidate for the Low Frequency Instrument of the Planck European Space Agency mission due to its high level of integrated polarized flux density (∼0.50 ± 0.06 Jy) on a scale of 10 arcmin. Six out of the seven sources have a clearly detected compact radio core in our images, with either a null detection or less than 2 per cent detection of polarized emission from the nuclei. Most sources with detected jets have magnetic field alignments running in a longitudinal configuration, however, PKS 1333−33 exhibits transverse fields and an orthogonal change in field geometry from nucleus to jets.

Keywords: polarization; galaxies: active; galaxies: magnetic fields; cosmic microwave background; radio continuum: galaxies

Journal Article.  7664 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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