University of Hertfordshire

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From the same journal

The XXL Survey: XXIX. GMRT 610 MHz continuum observations

Research output: Contribution to journalArticlepeer-review


  • 1803.06142v1

    Accepted author manuscript, 2.58 MB, PDF document

  • Vernesa Smolcic
  • Huib Intema
  • Bruno Slaus
  • Somak Raychaudhury
  • Mladen Novak
  • Cathy Horellou
  • Lucio Chiappetti
  • Jacinta Delhaize
  • Mark Birkinshaw
  • Marco Bondi
  • Malcolm Bremer
  • Paolo Ciliegi
  • Chiara Ferrari
  • Konstantinos Kolokythas
  • Chris Lidman
  • Sean L. McGee
  • Ray Norris
  • Marguerite Pierre
  • Huub Rottgering
  • Cyril Tasse
  • And 1 others
  • Wendy Williams
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Original languageEnglish
Article numberA14
Pages (from-to)1-10
Number of pages10
JournalAstronomy & Astrophysics
Early online date20 Nov 2018
Publication statusPublished - 1 Dec 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 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).


Accepted for publication in a forthcoming issue of Astronomy & Astrophysics. Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO.

ID: 13674973