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


Galaxies: evolution

Galaxies: clusters: general

Radio continuum: galaxies

X-rays: galaxies


Vernesa Smolčić

University of Zagreb

Jacinta Delhaize

University of Zagreb

Minh Huynh

University of Western Australia

M. Bondi

INAF OAS Bologna

Paolo Ciliegi

INAF OAS Bologna

Mladen Novak

University of Zagreb

Nikola Baran

University of Zagreb

M. Birkinshaw

University of Bristol

M. Bremer

University of Bristol

L. Chiappetti

INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan

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

INAF OAS Bologna

University of Bologna

Astronomy and Astrophysics

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

Vol. 592 Art. no A10 A10

Subject Categories

Astronomy, Astrophysics and Cosmology



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