The XXL Survey: XI. ATCA 2.1 GHz continuum observations ?

V. Smolčić, J. Delhaize, M. Huynh, M. Bondi, P. Ciliegi, M. Novak, N. Baran, M. Birkinshaw, M.N. Bremer, L. Chiappetti, C. Ferrari, S. Fotopoulou, C. Horellou, S.L. McGee, F. Pacaud, M. Pierre, S. Raychaudhury, H. Röttgering, C. Vignali

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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 with a 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 of observed parameters. We find that 305 sources are resolved, of which 77 consist of multiple radio components. These number counts are in agreement with those found for the COSMOS-VLA 1.4 GHz survey. We derive spectral indices by a comparison with the Sydney University Molongolo Sky Survey (SUMSS) 843MHz 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 with complementary X-ray data in the field. This will facilitate studies of the physical mechanisms of radio-loud and radio-quiet AGNs and galaxy clusters, and the role they play in galaxy evolution. The source catalogue is publicly available online via the XXL Master Catalogue browser and the Centre de Données astronomiques de Strasbourg (CDS). © ESO 2016.
Original languageEnglish
JournalAstronomy and Astrophysics
Volume592
Early online date15 Jun 2016
DOIs
Publication statusE-pub ahead of print - 15 Jun 2016

Bibliographical note

Export Date: 15 August 2017

CODEN: AAEJA

Funding details: RE 1462-6, DFG, Deutsche Forschungsgemeinschaft

Funding text: This research was funded by the European Union's Seventh Framework program under grant agreement 333654 (CIG, "AGN feedback"). V.S., J.D. and M.N. acknowledge funding from the European Union's Seventh Framework program under grant agreement 337595 (ERC Starting Grant, "CoSMass"). V.S. acknowledges funding from the Australian Group of Eight European Fellowships 2013. F.P. acknowledges support from the BMBF/DLR grant 50 OR 1117, the DFG grant RE 1462-6 and the DFG Transregio Programme TR33. M.N.B. and M. Birkinshaw acknowledge funding from the UK's STFC. H.R. acknowledges support from the ERC Advanced Investigator program NewClusters 321271.

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Keywords

  • Galaxies: clusters: general
  • Galaxies: evolution
  • Radio continuum: galaxies
  • Surveys
  • X-rays: galaxies
  • Galaxies
  • Optical waveguides
  • Radio astronomy
  • Surveying
  • Angular resolution
  • Galaxies: clusters: General
  • Galaxies: evolutions
  • Galaxy evolution
  • Physical mechanism
  • Spectral indices
  • X rays:galaxies

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