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|Title:||The XXL Survey. XXIX. GMRT 610 MHz continuum observations||Authors:||Smolčić, Vernesa
McGee, Sean L.
|Issue Date:||2018||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||620||First Page:||A14||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<SUP>-1</SUP> 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<SUP>-1</SUP>, while that over the outer 12.66 square degree area (which excludes the noisy edges) is about 45 μJy beam<SUP>-1</SUP>. 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). <P />The full catalogue (XXL_GMRT_17) is also available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://126.96.36.199) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A14">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A14||Note:||Part of the second data release of the XXL Survey. Associated data is accessible via CDS and via the XXL Database hosted at IASF-MI||URI:||http://hdl.handle.net/20.500.12386/27589||URL:||https://www.aanda.org/articles/aa/full_html/2018/12/aa32336-17/aa32336-17.html
|Appears in Collections:||1.01 Articoli in rivista|
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|j111arxiv-1803.06142.pdf||postprint||2.65 MB||Adobe PDF||View/Open|
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