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        The XXL Survey: : XXIX. GMRT 610 MHz continuum observations

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        Author
        Smolcic, Vernesa
        Intema, Huib
        Slaus, Bruno
        Raychaudhury, Somak
        Novak, Mladen
        Horellou, Cathy
        Chiappetti, Lucio
        Delhaize, Jacinta
        Birkinshaw, Mark
        Bondi, Marco
        Bremer, Malcolm
        Ciliegi, Paolo
        Ferrari, Chiara
        Kolokythas, Konstantinos
        Lidman, Chris
        McGee, Sean L.
        Norris, Ray
        Pierre, Marguerite
        Rottgering, Huub
        Tasse, Cyril
        Williams, Wendy
        Attention
        2299/20819
        Abstract
        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 GMRTXXL- 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).
        Publication date
        2018-12-01
        Published in
        Astronomy & Astrophysics
        Published version
        https://doi.org/10.1051/0004-6361/201732336
        License
        Other
        Other links
        http://hdl.handle.net/2299/20819
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