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Journal Articles Astronomy and Astrophysics - A&A Year : 2018

The XXL Survey

Vernesa Smolčić
  • Function : Correspondent author
Mladen Novak
Chiara Ferrari
Chris Lidman
Wendy Williams


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).
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Dates and versions

cea-02498180 , version 1 (04-03-2020)



Vernesa Smolčić, Huib Intema, Bruno Šlaus, Somak Raychaudhury, Mladen Novak, et al.. The XXL Survey: XXIX. GMRT 610 MHz continuum observations. Astronomy and Astrophysics - A&A, 2018, 620, pp.A14. ⟨10.1051/0004-6361/201732336⟩. ⟨cea-02498180⟩
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