The XXL Survey. XXIX. GMRT 610 MHz continuum observations

Smolčić, Vernesa and Intema, Huib and Šlaus, Bruno and Raychaudhury, Somak and Novak, Mladen and Horellou, Cathy and Chiappetti, Lucio and Delhaize, Jacinta and Birkinshaw, Mark and Bondi, Marco and Bremer, Malcolm and Ciliegi, Paolo and Ferrari, Chiara and Kolokythas, Konstantinos and Lidman, Chris and McGee, Sean L. and Norris, Ray and Pierre, Marguerite and Röttgering, Huub and Tasse, Cyril and Williams, Wendy (2018) The XXL Survey. XXIX. GMRT 610 MHz continuum observations. Astronomy and Astrophysics, 620. A14. ISSN 0004-6361

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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 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 presenta 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 fluxdensity. 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).

Item Type: Article
Keywords: catalogs, surveys, galaxies: active
Date: 2018
Number of Pages: 10
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © ESO 2018. Received: 21 November 2017; Accepted: 6 February 2018; Published online: 20 November 2018.
Divisions: Faculty of Science > Department of Physics
Publisher: EDP Sciences
Depositing User: Vernesa Smolčić
Date Deposited: 14 Apr 2019 18:18
Last Modified: 14 Apr 2019 18:29

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