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LOFAR 150-MHz observations of the Bootes field: catalogue and source counts

W. L. Williams ; R. J. van Weeren ; H. J. A. Rottgering ; P. Best ; T. J. Dijkema ; F. De Gasperin ; M. J. Hardcastle ; G. Heald ; I. Prandoni ; J. Sabater ; T. W. Shimwell ; C. Tasse ; I. M. van Bemmel ; M. Bruggen ; G. Brunetti ; John Conway (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; T. Ensslin ; D. Engels ; H. Falcke ; C. Ferrari ; M. Haverkorn ; N. Jackson ; M. J. Jarvis ; A. D. Kapinska ; E. K. Mahony ; G. K. Miley ; L. K. Morabito ; R. Morganti ; E. Orru ; E. Retana-Montenegro ; S. S. Sridhar ; M. C. Toribio ; G. J. White ; M. W. Wise ; J. T. L. Zwart
Monthly Notices of the Royal Astronomical Society (0035-8711). Vol. 460 (2016), 3, p. 2385-2412.
[Artikel, refereegranskad vetenskaplig]

We present the first wide area (19 deg(2)), deep (a parts per thousand 120-150 mu Jy beam(-1)), high-resolution (5.6 x 7.4 arcsec) LOFAR High Band Antenna image of the Bootes field made at 130-169 MHz. This image is at least an order of magnitude deeper and 3-5 times higher in angular resolution than previously achieved for this field at low frequencies. The observations and data reduction, which includes full direction-dependent calibration, are described here. We present a radio source catalogue containing 6 276 sources detected over an area of 19 deg(2), with a peak flux density threshold of 5 sigma. As the first thorough test of the facet calibration strategy, introduced by van Weeren et al., we investigate the flux and positional accuracy of the catalogue. We present differential source counts that reach an order of magnitude deeper in flux density than previously achieved at these low frequencies, and show flattening at 150-MHz flux densities below 10 mJy associated with the rise of the low flux density star-forming galaxies and radio-quiet AGN.

Nyckelord: techniques: interferometric, surveys, galaxies: active, radio continuum: galaxies

Denna post skapades 2016-10-19.
CPL Pubid: 243682


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Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium


Astronomi, astrofysik och kosmologi

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