LOFAR 150-MHz observations of the Bootes field: catalogue and source counts
Artikel i vetenskaplig tidskrift, 2016
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.
radio continuum: galaxies
surveys
galaxies: active
techniques: interferometric
Författare
W. L. Williams
Universiteit Leiden
Netherlands Institute for Radio Astronomy (ASTRON)
University of Hertfordshire
R. J. van Weeren
Harvard-Smithsonian Center for Astrophysics
H. Rottgering
Universiteit Leiden
P. Best
Royal Observatory
T. J. Dijkema
Netherlands Institute for Radio Astronomy (ASTRON)
F. De Gasperin
Universität Hamburg
M. J. Hardcastle
University of Hertfordshire
G. Heald
Rijksuniversiteit Groningen
Netherlands Institute for Radio Astronomy (ASTRON)
I. Prandoni
Istituto nazionale di astrofisica (INAF)
J. Sabater
Royal Observatory
T. W. Shimwell
Universiteit Leiden
C. Tasse
Université Paris Diderot
I. van Bemmel
Joint Institute for VLBI in Europe (JIVE)
M. Brüggen
Universität Hamburg
G. Brunetti
Istituto nazionale di astrofisica (INAF)
John Conway
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
T.A. Enßlin
Max-Planck-Gesellschaft
D. Engels
Universität Hamburg
H. Falcke
Radboud Universiteit
Netherlands Institute for Radio Astronomy (ASTRON)
C. Ferrari
Observatoire de la Cote d'Azur
M. Haverkorn
Radboud Universiteit
Universiteit Leiden
N. Jackson
University of Manchester
M. J. Jarvis
University of Oxford
University of the Western Cape
A. D. Kapinska
University of Portsmouth
University of Western Australia
ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)
E. Mahony
Netherlands Institute for Radio Astronomy (ASTRON)
G. K. Miley
Universiteit Leiden
L. K. Morabito
Universiteit Leiden
R. Morganti
Netherlands Institute for Radio Astronomy (ASTRON)
Rijksuniversiteit Groningen
E. Orru
Netherlands Institute for Radio Astronomy (ASTRON)
E. Retana-Montenegro
Universiteit Leiden
S. S. Sridhar
Netherlands Institute for Radio Astronomy (ASTRON)
Rijksuniversiteit Groningen
M. C. Toribio
Universiteit Leiden
G. J. White
STFC Rutherford Appleton Laboratory
Open University
M. W. Wise
Anton Pannekoek Institute for Astronomy
Netherlands Institute for Radio Astronomy (ASTRON)
J. T L Zwart
University of the Western Cape
University of Cape Town
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 460 3 2385-2412Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1093/mnras/stw1056