The XXL Survey: XI. ATCA 2.1 GHz continuum observations

Vernesa Smolcic, Jacinta Delhaize, Minh Huynh, Marco Bondi, Paolo Ciliegi, Mladen Novak, Nikola Baran, Mark Birkinshaw, Malcolm Bremer, Lucio Chiappetti, Ciara Ferrari, Sotiria Fotopoulou, Cathy Horellou, Sean McGee, Florian Pacaud, Marguerite Pierre, Somak Raychaudhury, Huub Rottgering, Cristian Vignali

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

We present 2.1 GHz imaging with the Australia Telescope Compact Array (ATCA) of a 6.5 deg2 region within the XXM-Newton XXL South field using a band of 1.1−3.1 GHz. We achieve an angular resolution of 4.7"×4.2" in the final radio continuum map witha median rms noise level of 50 μJy/beam. We identify 1389 radio sources in the field with peak S/N ≥ 5 and present the catalogue ofobserved parameters. We find that 305 sources are resolved, of which 77 consist of multiple radio components. These number countsare in agreement with those found for the COSMOS-VLA 1.4 GHz survey. We derive spectral indices by a comparison with theSydney University Molongolo Sky Survey (SUMSS) 843 MHz data. We find an average spectral index of −0.78 and a scatter of 0.28, in line with expectations. This pilot survey was conducted in preparation for a larger ATCA program to observe the full 25 deg2 southern XXL field. When complete, the survey will provide a unique resource of sensitive, wide-field radio continuum imaging withcomplementary X-ray data in the field. This will facilitate studies of the physical mechanisms of radio-loud and radio-quiet AGNsand galaxy clusters, and the role they play in galaxy evolution. The source catalogue is publicly available online via the XXL MasterCatalogue browser and the Centre de Données astronomiques de Strasbourg (CDS).
Original languageEnglish
Article numberA10
Number of pages7
JournalAstronomy and Astrophysics
Volume592
Early online date15 Jun 2016
DOIs
Publication statusPublished - Aug 2016

Keywords

  • radio continuum: galaxies
  • X-rays: galaxies
  • surveys
  • galaxies: evolution
  • galaxies: clusters: general

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