The polarimetric multi-frequency radio sources properties

Abstract

The polarization properties of extragalactic radio sources at frequencies higher than 20 GHz are still poorly constrained. However, their characterization would provide invaluable information about the physics of the emission processes and is crucial to estimate their contamination as foregrounds of the polarized cosmic microwave background (CMB) angular power spectrum on scales < 30 arcmin. In this contribution, after summarizing the state-of-the-art of polarimetric observations in the millimetric wavelength bands, we present our observations of a complete sample of 53 sources with S > 200 mJy (at 20 GHz) carried out with the Australia Telescope Compact Array between 5.5 and 38 GHz. The analysis clearly shows that polarization properties cannot be simply inferred from total intensity ones, as the spectral behaviors of the two signals are typically different.

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• Electrodynamics with Lorentz-violating operators of arbitrary dimension
• The Wilkinson Microwave Anisotropy Probe (WMAP) Source Catalog
• The properties of extragalactic radio sources selected at 20 GHz
• The Australia Telescope 20 GHz (AT20G) Survey: The Bright Source Sample
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Cited by in corpus (4)

• Multi-frequency polarimetry of a complete sample of PACO radio sources
• On spacetime structure and electrodynamics
• 28 -- 40 GHz variability and polarimetry of bright compact sources in the QUIJOTE cosmological fields
• Foreword with a table of contents for Special IJMPD Issue on Spacetime Structure and Electrodynamics