The XXL Survey: XI. ATCA 2.1 GHz continuum observations?
Review article, 2016
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).
X-rays: galaxies
Surveys
Galaxies: clusters: general
Galaxies: evolution
Radio continuum: galaxies
Author
Vernesa Smolčić
University of Zagreb
Jacinta Delhaize
University of Zagreb
Minh Huynh
University of Western Australia
M. Bondi
Istituto nazionale di astrofisica (INAF)
Paolo Ciliegi
Istituto nazionale di astrofisica (INAF)
Mladen Novak
University of Zagreb
Nikola Baran
University of Zagreb
M. Birkinshaw
University of Bristol
M. Bremer
University of Bristol
L. Chiappetti
Istituto nazionale di astrofisica (INAF)
C. Ferrari
Observatoire de la Cote d'Azur
S. Fotopoulou
University of Geneva
Cathy Horellou
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
Sean L. McGee
University of Birmingham
F. Pacaud
University of Bonn
M. Pierre
The French Alternative Energies and Atomic Energy Commission (CEA)
Somak Raychaudhury
University of Birmingham
H.J.A. Rottgering
Leiden University
Cristian Vignali
University of Bologna
Istituto nazionale di astrofisica (INAF)
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 592 Art. no A10 A10Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201526818