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Publication - Professor Mark Birkinshaw

    The XXL Survey

    XXIX. GMRT 610 MHz continuum observations


    Smolčić, V, Intema, H, Šlaus, B, Raychaudhury, S, Novak, M, Horellou, C, Chiappetti, L, Delhaize, J, Birkinshaw, M, Bondi, M, Bremer, M, Ciliegi, P, Ferrari, C, Kolokythas, K, Lidman, C, McGee, SL, Norris, R, Pierre, M, Röttgering, H, Tasse, C & Williams, W, 2018, ‘The XXL Survey: XXIX. GMRT 610 MHz continuum observations’. Astronomy and Astrophysics, vol 620.


    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).

    Full details in the University publications repository