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LOFAR/H-ATLAS: a deep low-frequency survey of the Herschel-ATLAS North Galactic Pole field

M. J. Hardcastle ; G. Gurkan ; R. J. van Weeren ; W. L. Williams ; P. N. Best ; F. De Gasperin ; D. A. Rafferty ; S. C. Read ; J. Sabater ; T. W. Shimwell ; D. J. B. Smith ; C. Tasse ; N. Bourne ; M. Brienza ; M. Bruggen ; G. Brunetti ; K. T. Chyzy ; John Conway (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; L. Dunne ; S. A. Eales ; S. J. Maddox ; M. J. Jarvis ; E. K. Mahony ; R. Morganti ; I. Prandoni ; H. J. A. Rottgering ; E. Valiante ; G. J. White
Monthly Notices of the Royal Astronomical Society (0035-8711). Vol. 462 (2016), 2, p. 1910-1936.
[Artikel, refereegranskad vetenskaplig]

We present Low-Frequency Array (LOFAR) High-Band Array observations of the Herschel-ATLAS North Galactic Pole survey area. The survey we have carried out, consisting of four pointings covering around 142 deg(2) of sky in the frequency range 126-173 MHz, does not provide uniform noise coverage but otherwise is representative of the quality of data to be expected in the planned LOFAR wide-area surveys, and has been reduced using recently developed 'facet calibration' methods at a resolution approaching the full resolution of the data sets (similar to 10 x 6 arcsec) and an rms off-source noise that ranges from 100 mu Jy beam(-1) in the centre of the best fields to around 2 mJy beam(-1) at the furthest extent of our imaging. We describe the imaging, cataloguing and source identification processes, and present some initial science results based on a 5 sigma source catalogue. These include (i) an initial look at the radio/far-infrared correlation at 150 MHz, showing that many Herschel sources are not yet detected by LOFAR; (ii) number counts at 150 MHz, including, for the first time, observational constraints on the numbers of star-forming galaxies; (iii) the 150-MHz luminosity functions for active and star-forming galaxies, which agree well with determinations at higher frequencies at low redshift, and show strong redshift evolution of the star-forming population; and (iv) some discussion of the implications of our observations for studies of radio galaxy life cycles.

Nyckelord: galaxies, active, infrared, galaxies, radio continuum, galaxies, star-formation history, infrared-radio correlation, science, demonstration phase, mass-selected galaxies, less-than 1.0, luminosity, function, sky survey, forming galaxies, wide-field, sdss-iii

Denna post skapades 2016-10-28. Senast ändrad 2016-11-08.
CPL Pubid: 244405


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Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium



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Onsala rymdobservatorium