Multi-frequency polarimetry of a complete sample of PACO radio sources

Abstract

We present high sensitivity polarimetric observations in 6 bands covering the 5.5-38 GHz range of a complete sample of 53 compact extragalactic radio sources brighter than 200 mJy at 20 GHz. The observations, carried out with the Australia Telescope Compact Array (ATCA), achieved a 91% detection rate (at 5 sigma). Within this frequency range the spectra of about 95% of sources are well fitted by double power laws, both in total intensity and in polarisation, but the spectral shapes are generally different in the two cases. Most sources were classified as either steep- or peaked-spectrum but less than 50% have the same classification in total and in polarised intensity. No significant trends of the polarisation degree with flux density or with frequency were found. The mean variability index in total intensity of steep-spectrum sources increases with frequency for a 4-5 year lag, while no significant trend shows up for the other sources and for the 8 year lag. In polarisation, the variability index, that could be computed only for the 8 year lag, is substantially higher than in total intensity and has no significant frequency dependence.

arXiv comment15 pages, 7 figures, accepted for publication in MNRAS

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Cited by in corpus (16)

• The Tiered Radio Extragalactic Continuum Simulation (T-RECS)
• Exploring Cosmic Origins with CORE: B-mode Component Separation
• Impact of polarised extragalactic sources on the measurement of CMB B-mode anisotropies
• Exploring Cosmic Origins with CORE: Extragalactic sources in Cosmic Microwave Background maps
• Forecasting Polarized Radio Sources for CMB observations
• Fractional Polarisation of Extragalactic Sources in the 500-square-degree SPTpol Survey
• Statistics of the fractional polarisation of compact radio sources in Planck maps
• Simulated catalogs and maps of radio galaxies at millimeter wavelengths in Websky
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• A Bayesian method for point source polarization estimation
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• The Additional Representative Images for Legacy (ARI-L) project for the ALMA Science Archive