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

    76265.pdf (7.694Mb)
    Access Status
    Open access
    Authors
    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.
    Chy, K.T.
    Cochrane, R.
    Conway, J.E.
    Croston, J.H.
    Danezi, A.
    Duncan, K.
    Haverkorn, M.
    Heald, G.H.
    Iacobelli, M.
    Intema, Huib
    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, Carole
    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.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Shimwell, T.W. and Tasse, C. and Hardcastle, M.J. and Mechev, A.P. and Williams, W.L. and Best, P.N. and Röttgering, H.J.A. et al. 2019. The LOFAR Two-metre Sky Survey: II. First data release. Astronomy and Astrophysics. 622: ARTN A1.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201833559
    ISSN
    0004-6361
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Remarks

    Reproduced with permission from Astronomy & Astrophysics, © ESO

    URI
    http://hdl.handle.net/20.500.11937/76023
    Collection
    • Curtin Research Publications
    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 S144 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.

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