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

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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
Other note
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