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9th of January 2020
Polarised radio sources in the XXL-South field
by Eyles et al.
Eyles et al. have investigated the properties of the polarised radio population in the central 6.5 square degrees of the XXL-South X-ray survey field. The observations were made at 2.1 GHz using the Australia Telescope Compact Array (ATCA) as a mosaic with 81 pointings and a synthesised beam of FWHM 5.2 arcseconds. A total of 39 polarised sources, involving 50 polarised source components, were found above a polarised flux density limit of 0.2 mJy at 1.3 GHz. The ATCA's susceptibility to polarisation leakage was also investigated, and it was found that ATCA mosaics with beam separations of less than 2/3 of the primary beam FWHM have an acceptable off-axis linear polarisation leakage of less than 1.4% at 1.3 GHz. The image above shows the polarised intensity mosaic at 1332 MHz. The 81 pointing centres of the mosaic are indicated with blue crosses and the 39 sources in the XXL39 dataset are indicated with red boxes. More details are given in the paper by Eyles et al, to be published in Astronomy & Astrophysics.

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