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.

galaxies: active

surveys

radio continuum: galaxies

techniques: interferometric

Författare

W. L. Williams

University of Hertfordshire

Universiteit Leiden

Netherlands Institute for Radio Astronomy (ASTRON)

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

INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

J. Sabater

Royal Observatory

T. W. Shimwell

Universiteit Leiden

C. Tasse

Université Paris Diderot

I. van Bemmel

Joint Institute for VLBI ERIC

M. Brüggen

Universität Hamburg

G. Brunetti

INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

John Conway

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

T.A. Enßlin

Max Planck-institutet

D. Engels

Universität Hamburg

H. Falcke

Netherlands Institute for Radio Astronomy (ASTRON)

Radboud Universiteit

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

Open University

Rutherford Appleton Laboratory

M. W. Wise

Netherlands Institute for Radio Astronomy (ASTRON)

Anton Pannekoek Institute for Astronomy

J. T L Zwart

University of Cape Town

University of the Western Cape

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 460 3 2385-2412

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1093/mnras/stw1056