Statistics of the fractional polarisation of compact radio sources in Planck maps

Abstract

In this work we apply the stacking technique to estimate the average fractional polarisation from 30 to 353 GHz of a primary sample of 1560 compact sources - essentially all radio sources - detected in the 30 GHz Planck all-sky map and listed in the second version of the Planck Catalogue of Compact Sources (PCCS2). We divide our primary sample in two subsamples according to whether the sources lay (679 sources) or not (881 sources) inside the sky region defined by the Planck Galactic mask (fsky ~ 60 per cent) and the area around the Magellanic Clouds. We find that the average fractional polarisation of compact sources is approximately constant (with frequency) in both samples (with a weighted mean over all the channels of 3.08 per cent outside and 3.54 per cent inside the Planck mask). In the sky region outside the adopted mask, we also estimate the μ and σ parameters for the log-normal distribution of the fractional polarisation, finding a weighted mean value over all the Planck frequency range of 1.0 for σ and 0.7 for μ (that would imply a weighted mean value for the median fractional polarisation of 1.9 per cent).

12 pages, 7 figures, 2 tables, MNRAS in press

References in corpus (7)

• A Joint Analysis of BICEP2/Keck Array and Planck Data
• The Cosmic Infrared Background Resolved by Spitzer. Contributions of Mid-Infrared Galaxies to the Far-Infrared Background
• The properties of extragalactic radio sources selected at 20 GHz
• The Australia Telescope 20 GHz (AT20G) Survey: The Bright Source Sample
• Degree of Polarization and Source Counts of Faint Radio Sources from Stacking Polarized Intensity
• Exploring Cosmic Origins with CORE: Extragalactic sources in Cosmic Microwave Background maps
• Multi-frequency polarimetry of a complete sample of PACO radio sources

Cited by in corpus (23)

• The Simons Observatory: Science goals and forecasts
• A Measurement of the Cosmic Microwave Background $B$-Mode Polarization Power Spectrum at Sub-Degree Scales from 2 years of POLARBEAR Data
• Exploring Cosmic Origins with CORE: B-mode Component Separation
• A Measurement of the Degree Scale CMB B-mode Angular Power Spectrum with POLARBEAR
• The Atacama Cosmology Telescope: Two-season ACTPol Extragalactic Point Sources and their Polarization properties
• 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
• Polarized accretion shocks from the cosmic web
• $B$-mode forecast of CMB-Bh$\overline{a}$rat
• Average fractional polarization of extragalactic sources at Planck frequencies
• Statistics of the fractional polarisation of extragalactic dusty sources in Planck HFI maps
• QSOs sigposting cluster size halos as gravitational lenses: halo mass, projected mass density profile and concentration at $z\sim 0.7$
• Quasi-stellar objects and galaxy mass density profiles derived using the submillimetre galaxies magnification bias
• Galaxy cluster mass density profile derived using the submillimetre galaxies magnification bias
• ALMA Band 3 polarimetric follow-up of a complete sample of faint PACO sources
• Characterization of Extragalactic Point-Sources on E- and B-mode Maps of the CMB Polarization
• QUIJOTE scientific results -- IX. Radio sources in the QUIJOTE-MFI wide survey maps
• A Bayesian method for point source polarization estimation
• Polarization fraction of Planck Galactic cold clumps and forecasts for the Simons Observatory
• 28 -- 40 GHz variability and polarimetry of bright compact sources in the QUIJOTE cosmological fields
• Constraining the polarisation flux density and angle of point sources by training a convolutional neural network