The XXL Survey XXXIX. Polarised radio sources in the XXL-South field
Journal article, 2020

Aims. We investigate the properties of the polarised radio population in the central 6.5 deg(2) of the XXL-South field observed at 2.1 GHz using the Australia Telescope Compact Array (ATCA) in 81 pointings with a synthesised beam of FWHM 5.2 ''. We also investigate the ATCA's susceptibility to polarisation leakage. Methods. We performed a survey of a 5.6 deg(2) subregion and calculated the number density of polarised sources. We derived the total and polarised spectral indices, in addition to comparing our source positions with those of X-ray-detected clusters. We measured the polarisation of sources in multiple pointings to examine leakage in the ATCA. Results. We find 39 polarised sources, involving 50 polarised source components, above a polarised flux density limit of 0.2 mJy at 1.332 GHz. The number density of polarised source components is comparable with recent surveys, although there is an indication of an excess at similar to 1 mJy. We find that those sources coincident with X-ray clusters are consistent in their properties with regard to the general population. In terms of the ATCA leakage response, we find that ATCA mosaics with beam separation of less than or similar to 2/3 of the primary beam FWHM have off-axis linear polarisation leakage less than or similar to 1.4% at 1.332 GHz.

radio continuum





R. A. J. Eyles

University Of Leicester

M. Birkinshaw

University of Bristol

V. Smolcic

University of Zagreb

Cathy Horellou

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

M. Huynh

University of Western Australia

CSIRO Astronomy and Space Science

A. Butler

University of Western Australia

J. Delhaize

University of Cape Town

C. Vignali

University of Bologna

Istituto nazionale di astrofisica (INAF)

M. Pierre

Paris Diderot University

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 633 A6

Subject Categories

Accelerator Physics and Instrumentation

Astronomy, Astrophysics and Cosmology

Theoretical Chemistry



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