The XXL Survey XXXIX. Polarised radio sources in the XXL-South field
Artikel i vetenskaplig tidskrift, 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

galaxies

active

galaxies

Författare

R. A. J. Eyles

University Of Leicester

M. Birkinshaw

University of Bristol

V. Smolcic

Sveučilište u Zagrebu

Cathy Horellou

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Extragalaktisk astrofysik

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

Universita di Bologna

Istituto nazionale di astrofisica (INAF)

M. Pierre

Université Paris Diderot

Astronomy and Astrophysics

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

Vol. 633 A6

Ämneskategorier

Acceleratorfysik och instrumentering

Astronomi, astrofysik och kosmologi

Teoretisk kemi

DOI

10.1051/0004-6361/201936042

Mer information

Senast uppdaterat

2020-01-13