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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28975
Title: The LOFAR Two-metre Sky Survey. III. First data release: Optical/infrared identifications and value-added catalogue
Authors: Williams, W. L.
Hardcastle, M. J.
Best, P. N.
Sabater, J.
Croston, J. H.
Duncan, K. J.
Shimwell, T. W.
Röttgering, H. J. A.
Nisbet, D.
Gürkan, G.
Alegre, L.
Cochrane, R. K.
Goyal, A.
Hale, C. L.
Jackson, N.
Jamrozy, M.
Kondapally, R.
Kunert-Bajraszewska, M.
Mahatma, V. H.
Mingo, B.
Morabito, L. K.
PRANDONI, ISABELLA 
Roskowinski, C.
Shulevski, A.
Smith, D. J. B.
Tasse, C.
Urquhart, S.
Webster, B.
White, G. J.
Beswick, R. J.
Callingham, J. R.
Chyży, K. T.
de Gasperin, F.
Harwood, J. J.
Hoeft, M.
Iacobelli, M.
McKean, J. P.
Mechev, A. P.
Miley, G. K.
Schwarz, D. J.
van Weeren, R. J.
Issue Date: 2019
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 622
First Page: A2
Abstract: The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168 MHz survey of the northern sky with diverse and ambitious science goals. Many of the scientific objectives of LoTSS rely upon, or are enhanced by, the association or separation of the sometimes incorrectly catalogued radio components into distinct radio sources and the identification and characterisation of the optical counterparts to these sources. We present the source associations and optical and/or IR identifications for sources in the first data release, which are made using a combination of statistical techniques and visual association and identification. We document in detail the colour- and magnitude-dependent likelihood ratio method used for statistical identification as well as the Zooniverse project, called LOFAR Galaxy Zoo, used for visual classification. We describe the process used to select which of these two different methods is most appropriate for each LoTSS source. The final LoTSS-DR1-IDs value-added catalogue presented contains 318 520 radio sources, of which 231 716 (73%) have optical and/or IR identifications in Pan-STARRS and WISE. <P />LoTSS.The value-added catalogue is available online at <A href="https://lofar-surveys.org/">http://https://lofar-surveys.org/</A>, as part of this data release.The catalogue is available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/622/A1">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/622/A1</A>
URI: http://hdl.handle.net/20.500.12386/28975
URL: https://www.aanda.org/articles/aa/full_html/2019/02/aa33564-18/aa33564-18.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201833564
Bibcode ADS: 2019A&A...622A...2W
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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