LOFAR 150-MHz observations of the Boötes field: catalogue and source counts
W. Williams
(1, 2, 3, 4)
,
R. van Weeren
(5)
,
H. Rottgering
(4, 1)
,
P. Best
(6)
,
T. Dijkema
(2)
,
F. de Gasperin
(7)
,
M. Hardcastle
(3)
,
G. Heald
(2, 8)
,
I. Prandoni
(9)
,
J. Sabater
(6)
,
T. Shimwell
(1, 4)
,
C. Tasse
(10)
,
I. van Bemmel
(11)
,
M. Bruggen
(7)
,
G. Brunetti
(9)
,
J. Conway
(12)
,
T. Ensslin
(13)
,
D. Engels
(7)
,
H. Falcke
(2, 14)
,
C. Ferrari
(15, 16)
,
M. Haverkorn
(14, 1, 4)
,
N. Jackson
(17)
,
M. Jarvis
(18, 19)
,
A. Kapińska
(20, 21, 22)
,
E. Mahony
(2)
,
G. Miley
(1, 4)
,
L. Morabito
(1, 4)
,
R. Morganti
(2, 23)
,
E. Orrù
(2)
,
E. Retana-Montenegro
(4, 1)
,
S. Sridhar
(2, 23)
,
M. Toribio
(4, 1)
,
G. White
(24, 25)
,
M. Wise
(26, 2)
,
J. Zwart
(19, 27)
1
Universiteit Leiden = Leiden University
2 ASTRON - Netherlands Institute for Radio Astronomy
3 UH - University of Hertfordshire [Hatfield]
4 Leiden Observatory [Leiden]
5 CfA - Harvard-Smithsonian Center for Astrophysics
6 SUPA School of Physics and Astronomy [Edinburgh]
7 University of Hamburg
8 University of Groningen [Groningen]
9 OABO - INAF - Osservatorio Astronomico di Bologna
10 GEPI - Galaxies, Etoiles, Physique, Instrumentation
11 JIVE ERIC - Joint Institute for VLBI in Europe
12 Chalmers University of Technology [Göteborg]
13 Max Planck Institute for Astrophysics
14 Radboud University [Nijmegen]
15 LAGRANGE - Joseph Louis LAGRANGE
16 OCA - Observatoire de la Côte d'Azur
17 JBCA - Jodrell Bank Centre for Astrophysics
18 University of Oxford
19 UWC - University of the Western Cape
20 ICRAR - International Centre for Radio Astronomy Research
21 ICG - Institute of Cosmology and Gravitation [Portsmouth]
22 CAASTRO - Centre of Excellence for All-Sky Astrophysics
23 Kapteyn Astronomical Institute [Groningen]
24 OU - The Open University [Milton Keynes]
25 RAL - STFC Rutherford Appleton Laboratory
26 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
27 University of Cape Town
2 ASTRON - Netherlands Institute for Radio Astronomy
3 UH - University of Hertfordshire [Hatfield]
4 Leiden Observatory [Leiden]
5 CfA - Harvard-Smithsonian Center for Astrophysics
6 SUPA School of Physics and Astronomy [Edinburgh]
7 University of Hamburg
8 University of Groningen [Groningen]
9 OABO - INAF - Osservatorio Astronomico di Bologna
10 GEPI - Galaxies, Etoiles, Physique, Instrumentation
11 JIVE ERIC - Joint Institute for VLBI in Europe
12 Chalmers University of Technology [Göteborg]
13 Max Planck Institute for Astrophysics
14 Radboud University [Nijmegen]
15 LAGRANGE - Joseph Louis LAGRANGE
16 OCA - Observatoire de la Côte d'Azur
17 JBCA - Jodrell Bank Centre for Astrophysics
18 University of Oxford
19 UWC - University of the Western Cape
20 ICRAR - International Centre for Radio Astronomy Research
21 ICG - Institute of Cosmology and Gravitation [Portsmouth]
22 CAASTRO - Centre of Excellence for All-Sky Astrophysics
23 Kapteyn Astronomical Institute [Groningen]
24 OU - The Open University [Milton Keynes]
25 RAL - STFC Rutherford Appleton Laboratory
26 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
27 University of Cape Town
W. Williams
- Fonction : Auteur
- PersonId : 755274
- ORCID : 0000-0001-7315-1596
R. van Weeren
- Fonction : Auteur
- PersonId : 766683
- ORCID : 0000-0002-0587-1660
F. de Gasperin
- Fonction : Auteur
- PersonId : 766669
- ORCID : 0000-0003-4439-2627
M. Hardcastle
- Fonction : Auteur
- PersonId : 780281
- ORCID : 0000-0003-4223-1117
- IdRef : 165734337
I. Prandoni
- Fonction : Auteur
- PersonId : 757553
- ORCID : 0000-0001-9680-7092
J. Sabater
- Fonction : Auteur
- PersonId : 778581
- ORCID : 0000-0003-1149-6294
T. Shimwell
- Fonction : Auteur
- PersonId : 783185
- ORCID : 0000-0001-5648-9069
G. Brunetti
- Fonction : Auteur
- PersonId : 759851
- ORCID : 0000-0003-4195-8613
C. Ferrari
- Fonction : Auteur
- PersonId : 743106
- IdHAL : chiara-ferrari
- ORCID : 0000-0002-2917-9759
M. Jarvis
- Fonction : Auteur
- PersonId : 765505
- ORCID : 0000-0001-7039-9078
L. Morabito
- Fonction : Auteur
- PersonId : 1208612
M. Wise
- Fonction : Auteur
- PersonId : 757714
- ORCID : 0000-0002-6470-2285
Résumé
We present the first wide area (19 deg2), deep (≈ 120–150 μJy beam−1), high resolution (5.6× 7.4 arcsec) LOFAR High Band Antenna image of the Bo ̈otes 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 deg2, with a peak flux density threshold of 5σ . 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.
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