LOFAR 150-MHz observations of the Boötes field: Catalogue and source counts

W. L. Williams; R. J. Van Weeren; H. J A Röttgering; 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. Brüggen; G. Brunetti; J. E. Conway; T. Enßlin; D. Engels; H. Falcke; C. Ferrari; M. Haverkorn; N. Jackson; M. J. Jarvis; A. D. Kapińska; E. K. Mahony; G. K. Miley; L. K. Morabito; R. Morganti; E. Orrú; E. Retana-Montenegro; S. S. Sridhar; M. C. Toribio; G. J. White; M. W. Wise; J. T L Zwart

doi:10.1093/mnras/stw1056

LOFAR 150-MHz observations of the Boötes field: Catalogue and source counts

W. L. Williams, R. J. Van Weeren, H. J A Röttgering, 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. Brüggen, G. Brunetti, J. E. Conway, T. Enßlin, D. Engels, H. Falcke, C. FerrariM. Haverkorn, N. Jackson, M. J. Jarvis, A. D. Kapińska, E. K. Mahony, G. K. Miley, L. K. Morabito, R. Morganti, E. Orrú, E. Retana-Montenegro, S. S. Sridhar, M. C. Toribio, G. J. White, M. W. Wise, J. T L Zwart

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Abstract

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 Boötes 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.

Original language	English
Pages (from-to)	2385-2412
Number of pages	28
Journal	Monthly Notices of the Royal Astronomical Society
Volume	460
Issue number	3
Early online date	29 May 2016
DOIs	https://doi.org/10.1093/mnras/stw1056
Publication status	Published - 2016

Keywords

Galaxies: active
Radio continuum: galaxies
Surveys
Techniques: interferometric

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10.1093/mnras/stw1056Licence: CC BY

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Williams, W. L., Van Weeren, R. J., Röttgering, H. J. A., Best, P., Dijkema, T. J., De Gasperin, F., Hardcastle, M. J., Heald, G., Prandoni, I., Sabater, J., Shimwell, T. W., Tasse, C., Van Bemmel, I. M., Brüggen, M., Brunetti, G., Conway, J. E., Enßlin, T., Engels, D., Falcke, H., ... Zwart, J. T. L. (2016). LOFAR 150-MHz observations of the Boötes field: Catalogue and source counts. Monthly Notices of the Royal Astronomical Society, 460(3), 2385-2412. https://doi.org/10.1093/mnras/stw1056

@article{a5a4674a85684326ba7fa834e7c95ccf,

title = "LOFAR 150-MHz observations of the Bo{\"o}tes field: Catalogue and source counts",

abstract = "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{\"o}tes 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.",

keywords = "Galaxies: active, Radio continuum: galaxies, Surveys, Techniques: interferometric",

author = "Williams, {W. L.} and {Van Weeren}, {R. J.} and R{\"o}ttgering, {H. J A} and P. Best and Dijkema, {T. J.} and {De Gasperin}, F. and Hardcastle, {M. J.} and G. Heald and I. Prandoni and J. Sabater and Shimwell, {T. W.} and C. Tasse and {Van Bemmel}, {I. M.} and M. Br{\"u}ggen and G. Brunetti and Conway, {J. E.} and T. En{\ss}lin and D. Engels and H. Falcke and C. Ferrari and M. Haverkorn and N. Jackson and Jarvis, {M. J.} and Kapi{\'n}ska, {A. D.} and Mahony, {E. K.} and Miley, {G. K.} and Morabito, {L. K.} and R. Morganti and E. Orr{\'u} and E. Retana-Montenegro and Sridhar, {S. S.} and Toribio, {M. C.} and White, {G. J.} and Wise, {M. W.} and Zwart, {J. T L}",

year = "2016",

doi = "10.1093/mnras/stw1056",

language = "English",

volume = "460",

pages = "2385--2412",

journal = "Royal Astronomical Society. Monthly Notices",

issn = "1365-2966",

publisher = "Oxford University Press",

number = "3",

}

Williams, WL, Van Weeren, RJ, Röttgering, HJA, Best, P, Dijkema, TJ, De Gasperin, F, Hardcastle, MJ, Heald, G, Prandoni, I, Sabater, J, Shimwell, TW, Tasse, C, Van Bemmel, IM, Brüggen, M, Brunetti, G, Conway, JE, Enßlin, T, Engels, D, Falcke, H, Ferrari, C, Haverkorn, M, Jackson, N, Jarvis, MJ, Kapińska, AD, Mahony, EK, Miley, GK, Morabito, LK, Morganti, R, Orrú, E, Retana-Montenegro, E, Sridhar, SS, Toribio, MC, White, GJ, Wise, MW & Zwart, JTL 2016, 'LOFAR 150-MHz observations of the Boötes field: Catalogue and source counts', Monthly Notices of the Royal Astronomical Society, vol. 460, no. 3, pp. 2385-2412. https://doi.org/10.1093/mnras/stw1056

TY - JOUR

T1 - LOFAR 150-MHz observations of the Boötes field

T2 - Catalogue and source counts

AU - Williams, W. L.

AU - Van Weeren, R. J.

AU - Röttgering, H. J A

AU - Best, P.

AU - Dijkema, T. J.

AU - De Gasperin, F.

AU - Hardcastle, M. J.

AU - Heald, G.

AU - Prandoni, I.

AU - Sabater, J.

AU - Shimwell, T. W.

AU - Tasse, C.

AU - Van Bemmel, I. M.

AU - Brüggen, M.

AU - Brunetti, G.

AU - Conway, J. E.

AU - Enßlin, T.

AU - Engels, D.

AU - Falcke, H.

AU - Ferrari, C.

AU - Haverkorn, M.

AU - Jackson, N.

AU - Jarvis, M. J.

AU - Kapińska, A. D.

AU - Mahony, E. K.

AU - Miley, G. K.

AU - Morabito, L. K.

AU - Morganti, R.

AU - Orrú, E.

AU - Retana-Montenegro, E.

AU - Sridhar, S. S.

AU - Toribio, M. C.

AU - White, G. J.

AU - Wise, M. W.

AU - Zwart, J. T L

PY - 2016

Y1 - 2016

N2 - 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 Boötes 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.

AB - 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 Boötes 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.

KW - Galaxies: active

KW - Radio continuum: galaxies

KW - Surveys

KW - Techniques: interferometric

UR - http://www.scopus.com/inward/record.url?scp=84983249283&partnerID=8YFLogxK

U2 - 10.1093/mnras/stw1056

DO - 10.1093/mnras/stw1056

M3 - Article

AN - SCOPUS:84983249283

VL - 460

SP - 2385

EP - 2412

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 1365-2966

IS - 3

ER -

LOFAR 150-MHz observations of the Boötes field: Catalogue and source counts

Abstract

Keywords

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