28-40 GHz variability and polarimetry of bright compact sources in the QUIJOTE cosmological fields

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openAccess

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Journal Title

Journal ISSN

Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2021-04

Major/Subject

Mcode

Degree programme

Language

en

Pages

15
4779-4793

Series

Monthly Notices of the Royal Astronomical Society, Volume 502, issue 4

Abstract

We observed 51 sources in the Q-U-I JOint TEnerife (QUIJOTE) cosmological fields that were brighter than 1 Jy at 30 GHz in the Planck Point Source Catalogue (version 1), with the Very Large Array at 28-40 GHz, in order to characterize their high-radio-frequency variability and polarization properties. We find a roughly lognormal distribution of polarization fractions with a median of 2 per cent, in agreement with previous studies, and a median rotation measure (RM) of ≈1110 rad m-2 with one outlier up to ≈64 000 rad m-2, which is among the highest RMs measured in quasar cores. We find hints of a correlation between the total intensity flux density and median polarization fraction. We find 59 per cent of sources are variable in total intensity, and 100 per cent in polarization at 3σ level, with no apparent correlation between total intensity variability and polarization variability. This indicates that it will be difficult to model these sources without simultaneous polarimetric monitoring observations and they will need to be masked for cosmological analysis.

Description

Publisher Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

cosmic background radiation, cosmology: observations, quasars: general, radio continuum: general

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Citation

Perrott, Y C, Lopez-Caniego, M, Genova-Santos, R T, Rubino-Martin, J A, Ashdown, M, Herranz, D, Lahteenmaki, A, Lasenby, A N, Lopez-Caraballo, C H, Poidevin, F & Tornikoski, M 2021, ' 28-40 GHz variability and polarimetry of bright compact sources in the QUIJOTE cosmological fields ', Monthly Notices of the Royal Astronomical Society, vol. 502, no. 4, pp. 4779-4793 . https://doi.org/10.1093/mnras/stab400