Wide-Field Imaging and Polarimetry for the Biggest and Brightest in the 20GHz Southern Sky

Abstract

We present wide-field imaging and polarimetry at 20GHz of seven of the most extended, bright (Stot >= 0.50 Jy), high-frequency selected radio sources in the southern sky with declinations < -30 deg. 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 20GHz Survey's 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 are 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 of the seven sources have a clearly detected compact radio core, with either a null or less than two percent detection of polarized emission from the nucleus. Most sources with detected jets have magnetic field alignments running in a longitudinal configuration, however PKS1333-33 exhibits transverse fields and an orthogonal change in field geometry from nucleus to jets.

arXiv comment17 pages, 9 figures, 2 tables

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Cited by in corpus (16)

• The Australia Telescope 20 GHz Survey: The Source Catalogue
• The Australia Telescope Compact Array Broadband Backend (CABB)
• The local radio-galaxy population at 20 GHz
• The Australia Telescope 20GHz (AT20G) Survey: analysis of the extragalactic source sample
• The AGN fuelling/feedback cycle in nearby radio galaxies - I. ALMA observations and early results
• Optical Properties of High-Frequency Radio Sources from the Australia Telescope 20 GHz (AT20G) Survey
• The Planck-ATCA Co-eval Observations (PACO) project: the bright sample
• Long-term variability of extragalactic radio sources in the Planck Early Release Compact Source Catalogue
• Polarization of the WMAP Point Sources
• Hard X-ray selected giant radio galaxies -- II. Morphological evidence of restarted radio activity
• A Polarisation Survey of Bright Extragalactic AT20G Sources
• Fermi-LAT and Suzaku Observations of the Radio Galaxy Centaurus B
• The AT20G view of Swift/BAT selected AGN: high-frequency radio waves meet hard X-rays
• Analysis of Fermi-LAT observations, UHECRs and neutrinos from the radio galaxy Centaurus B
• HI absorption associated with Norma's brightest cluster galaxy
• The Crab Nebula as a Calibrator for wide-beam Cosmic Microwave Background polarization surveys