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The LOFAR Two-metre Sky Survey - II. First data release

Shimwell, T. W.; Tasse, C.; Hardcastle, M. J.; Mechev, A. P.; Williams, W. L.; Best, P. N.; Röttgering, H. J. A.; Callingham, J. R.; Dijkema, T. J.; de Gasperin, F.; Hoang, D. N.; Hugo, B.; Mirmont, M.; Oonk, J. B. R.; Prandoni, I.; Rafferty, D.; Sabater, J.; Smirnov, O.; van Weeren, R. J.; White, G. J.; Atemkeng, M.; Bester, L.; Bonnassieux, E.; Brüggen, M.; Brunetti, G.; Chyży, K. T.; Cochrane, R.; Conway, J. E.; Croston, J. H.; Danezi, A.; Duncan, K.; Haverkorn, M.; Heald, G. H.; Iacobelli, M.; Intema, H. T.; Jackson, N.; Jamrozy, M.; Jarvis, M. J.; Lakhoo, R.; Mevius, M.; Miley, G. K.; Morabito, L.; Morganti, R.; Nisbet, D.; Orrú, E.; Perkins, S.; Pizzo, R. F.; Schrijvers, C.; Smith, D. J. B.; Vermeulen, R.; Wise, M. W.; Alegre, L.; Bacon, D. J.; van Bemmel, I. M.; Beswick, R. J.; Bonafede, A.; Botteon, A.; Bourke, S.; Brienza, M.; Calistro Rivera, G.; Cassano, R.; Clarke, A. O.; Conselice, C. J.; Dettmar, R. J.; Drabent, A.; Dumba, C.; Emig, K. L.; Enßlin, T. A.; Ferrari, C.; Garrett, M. A.; Génova-Santos, R. T.; Goyal, A.; Gürkan, G.; Hale, C.; Harwood, J. J.; Heesen, V.; Hoeft, M.; Horellou, C.; Jackson, C.; Kokotanekov, G.; Kondapally, R.; Kunert- Bajraszewska, M.; Mahatma, V.; Mahony, E. K.; Mandal, S.; McKean, J. P.; Merloni, A.; Mingo, B.; Miskolczi, A.; Mooney, S.; Nikiel- Wroczyński, B.; O'Sullivan, S. P.; Quinn, J.; Reich, W.; Roskowiński, C.; Rowlinson, A.; Savini, F.; Saxena, A.; Schwarz, D. J.; Shulevski, A.; Sridhar, S. S.; Stacey, H. R.; Urquhart, S.; van der Wiel, M. H. D.; Varenius, E.; Webster, B. and Wilber, A. (2019). The LOFAR Two-metre Sky Survey - II. First data release. Astronomy & Astrophysics, 622, article no. A1.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201833559
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Abstract

The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120–168 MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. For this data release 424 square degrees, or 2% of the eventual coverage, in the region of the HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45°00'00" to 57°00'00") were mapped using a fully automated direction-dependent calibration and imaging pipeline that we developed. A total of 325 694 sources are detected with a signal of at least five times the noise, and the source density is a factor of ∼10 higher than the most sensitive existing very wide-area radio-continuum surveys. The median sensitivity is S 144 MHz = 71 µJy beam−1 and the point-source completeness is 90% at an integrated flux density of 0.45 mJy. The resolution of the images is 6" and the positional accuracy is within 0.2". This data release consists of a catalogue containing location, flux, and shape estimates together with 58 mosaic images that cover the catalogued area. In this paper we provide an overview of the data release with a focus on the processing of the LOFAR data and the characteristics of the resulting images. In two accompanying papers we provide the radio source associations and deblending and, where possible, the optical identifications of the radio sources together with the photometric redshifts and properties of the host galaxies. These data release papers are published together with a further ∼20 articles that highlight the scientific potential of LoTSS.

Item Type: Journal Item
Copyright Holders: 2019 ESO
ISSN: 1432-0746
Project Funding Details:
Funded Project NameProject IDFunding Body
Jet energy injection in galaxy groups and clusters - transfer of CG funding (Transfer in)ST/R00109X/1STFC (Science & Technology Facilities Council)
Jet physics and impact via LOFAR extragalactic surveysST/R000794/1STFC (Science & Technology Facilities Council)
Keywords: surveys; catalogs; radio continuum: general; techniques: image processing
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Astronomy
Item ID: 58195
Depositing User: Judith Croston
Date Deposited: 06 Dec 2018 13:53
Last Modified: 02 May 2019 17:10
URI: http://oro.open.ac.uk/id/eprint/58195
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