Volume 620, December 2018
The XXL Survey: second series
|Number of page(s)||10|
|Section||Catalogs and data|
|Published online||20 November 2018|
The XXL Survey
XXIX. GMRT 610 MHz continuum observations★
Department of Physics, Faculty of Science, University of Zagreb,
Bijenička cesta 32,
2 Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA, Leiden, The Netherlands
3 Inter-University Centre for Astronomy and Astrophysics, Ganeshkhind, Puné 411 007, India
4 School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
5 Dept. of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden
6 INAF, IASF Milano, via Bassini 15, 20133 Milano, Italy
7 H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
8 INAF - Istituto di Radioastronomia di Bologna, via P. Gobetti 101, 40129 Bologna, Italy
9 INAF - Osservatorio Astronomico di Bologna, P. Gobetti 93/3, 40129 Bologna, Italy
10 Laboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Bd de l’Observatoire, CS 34229, 06304 Nice cedex 4, France
11 Australian Astronomical Observatory, North Ryde, NSW 2113, Australia
12 Western Sydney University, Locked Bag 1797, 1797 Penrith South, NSW, Australia
13 CSIRO Astronomy and Space Science, PO Box 76, 1710 Epping, NSW, Australia
14 AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, France
15 GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
16 School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
Accepted: 6 February 2018
We present the 25 square-degree GMRT-XXL-N 610 MHz radio continuum survey, conducted at 50 cm wavelength with the Giant Metrewave Radio Telescope (GMRT) towards the XXL Northern field (XXL-N). We combined previously published observations of the XMM-Large Scale Structure (XMM-LSS) field, located in the central part of XXL-N, with newly conducted observations towards the remaining XXL-N area, and imaged the combined data-set using the Source Peeling and Atmospheric Modeling (SPAM) pipeline. The final mosaic encompasses a total area of 30.4 square degrees, with rms <150 μJy beam−1 over 60% of the area. The rms achieved in the inner 9.6 square degree area, enclosing the XMM-LSS field, is about 200 μJy beam−1, while that over the outer 12.66 square degree area (which excludes the noisy edges) is about 45 μJy beam−1. The resolution of the final mosaic is 6.5 arcsec. We present a catalogue of 5434 sources detected at ≥7 ×rms. We verify, and correct the reliability of, the catalog in terms of astrometry, flux, and false detection rate. Making use of the (to date) deepest radio continuum survey over a relatively large (2 square degree) field, complete at the flux levels probed by the GMRT-XXL-N survey, we also assess the survey’s incompleteness as a function of flux density. The radio continuum sensitivity reached over a large field with a wealth of multi-wavelength data available makes the GMRT-XXL-N 610 MHz survey an important asset for studying the physical properties, environments and cosmic evolution of radio sources, in particular radio-selected active galactic nuclei (AGN).
Key words: catalogs / surveys / galaxies: active
The full catalogue (XXL_GMRT_17) is also available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsarc.u-strasbg.fr/vizbin/qcat?J/A+A/620/A14
© ESO 2018
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