The XXL Survey. XXIX. GMRT 610 MHz continuum observations

Journal
Date Issued
2018
Author(s)
Smolčić, Vernesa
•
Intema, Huib
•
Šlaus, Bruno
•
Raychaudhury, Somak
•
Novak, Mladen
•
Horellou, Cathy
•
•
Delhaize, Jacinta
•
Birkinshaw, Mark
•
•
Bremer, Malcolm
•
•
Ferrari, Chiara
•
Kolokythas, Konstantinos
•
Lidman, Chris
•
McGee, Sean L.
•
Norris, Ray
•
Pierre, Marguerite
•
Röttgering, Huub
•
Tasse, Cyril
•
Williams, Wendy
DOI
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 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).

The full catalogue (XXL_GMRT_17) is also available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A14

Volume
620
Start page
A14
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2018A&A...620A..14S
Rights
open.access
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