LOFAR/H-ATLAS: a deep low-frequency survey of the Herschel-ATLAS North Galactic Pole field
Date Issued
2016
Author(s)
Hardcastle, M. J.
•
Gürkan, G.
•
van Weeren, R. J.
•
Williams, W. L.
•
Best, P. N.
•
•
Rafferty, D. A.
•
•
Sabater, J.
•
Shimwell, T. W.
•
Smith, D. J. B.
•
Tasse, C.
•
Bourne, N.
•
•
Brüggen, M.
•
•
Chyży, K. T.
•
Conway, J.
•
Dunne, L.
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Eales, S. A.
•
Maddox, S. J.
•
Jarvis, M. J.
•
Mahony, E. K.
•
Morganti, R.
•
•
Röttgering, H. J. A.
•
Valiante, E.
•
White, G. J.
Abstract
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 deg2 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 (∼10 × 6 arcsec) and an rms off-source noise that ranges from 100 μJy 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 5σ 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.
Volume
462
Issue
2
Start page
1910
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.462.1910H
Rights
open.access
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