J/A+A/598/A104ivo://CDS.VizieR/J/A+A/598/A104doi:10.26093/cds/vizier.35980104CDSShimwell T.W.Rottgering H.J.A.Best P.N.Williams W.L.Dijkema T.J.,de Gasperin F.Hardcastle M.J.Heald G.H.Hoang D.N.Horneffer A.,Intema H.Mahony E.K.Mandal S.Mechev A.P.Morabito L.Oonk J.B.R.,Rafferty D.Retana-Montenegro E.Sabater J.Tasse C.van Weeren R.J.,Bruggen M.Brunetti G.Chyzy K.T.Conway J.E.Haverkorn M.Jackson N.,Jarvis M.J.McKean J.P.Miley G.K.Morganti R.White G.J.Wise M.W.,van Bemmel I.M.Beck R.Brienza M.Bonafede A.Calistro Rivera G.,Cassano R.Clarke A.O.Cseh D.Deller A.Drabent A.van Driel W.,Engels D.Falcke H.Ferrari C.Frohlich S.Garrett M.A.Harwood J.J.,Heesen V.Hoeft M.Horellou C.Israel F.P.Kapinska A.D.,Kunert-Bajraszewska M.McKay D.J.Mohan N.R.Orru E.Pizzo R.F.,Prandoni I.Schwarz D.J.Shulevski A.Sipior M.Smith D.J.B.,Sridhar S.S.Steinmetz M.Stroe A.Varenius E.van der Werf P.P.,Zensus J.A.Zwart J.T.L.2017-03-15T07:08:33Z2017-02-09T08:34:13ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysradio-continuum-emissionThe LOFAR Two-metre Sky Survey (LoTSS) is a deep 120-168MHz imaging survey that will eventually cover the entire Northern sky. Each of the 3170 pointings will be observed for 8 hrs, which, at most declinations, is sufficient to produce ~5-arcsec resolution images with a sensitivity of ~0.1mJy/beam and accomplish the main scientific aims of the survey which are to explore the formation and evolution of massive black holes, galaxies, clusters of galaxies and large-scale structure. Due to the compact core and long baselines of LOFAR, the images provide excellent sensitivity to both highly extended and compact emission. For legacy value, the data are archived at high spectral and time resolution to facilitate subarcsecond imaging and spectral line studies. In this paper we provide an overview of the LoTSS. We outline the survey strategy, the observational status, the current calibration techniques, a preliminary data release, and the anticipated scientific impact. The preliminary images that we have released were created using a fully-automated but direction-independent calibration strategy and are significantly more sensitive than those produced by any existing large-area low-frequency survey. In excess of 44,000 sources are detected in the images that have a resolution of 25-arcsec, typical noise levels of less than 0.5mJy/beam, and cover an area of over 350 square degrees in the region of the HETDEX Spring Field (right ascension 10:45:00 to 15:30:00 and declination 45:00:00 to 57:00:00).2017A&A...598A.104Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/598/A104CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://lofar.strw.leidenuniv.nl : LoTSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/598/A104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/598/A104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/598/A104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/598/A104https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/598/A104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/598/A104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/598/A104/lotss (Full source catalogue of LoTSS PDR 120-168MHz sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/598/A104/lotss?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/598/A104/lotss?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/598/A104/lotss?GETtext/xml+votable180.050000true166.190746.420530.0055555555555555564/349-351 373 669 671 685-686 689-690 692-694 698 707 712-714 5/1373-1375 1389-1391 1393 1395 1476 1478 1485 1487 1489 1491 1496-1497 1499-1500 1502 1508 1521 2654-2655 2669-2671 2673-2675 2680-2682 2717-2719 2733-2735 2737-2739 2748-2749 2753-2755 2764-2765 2767 2780-2782 2784 2786-2787 2789-2791 2796-2798 2800-2802 2821 2823 2827 2832 2834 2840 2842 2860-2862 2864-2866 2944-2946 6/5471 5487 5491 5551 5555 5571 5577-5579 5893-5895 5900-5901 5903 5908-5910 5916 5939 5945-5947 5952-5953 5955 5992-5993 5995 6004-6006 6036 6040-6041 6081 6083 6089 6092 6096 9918-9919 9962 10607 10611 10614 10655 10671 10675 10691 10732-10733 10847 10863 10867 10911 10927 10931 10947 11000-11002 11004-11005 11007 11011 11064-11066 11132 11140 11142-11143 11154-11155 11196 11212 11216 11232 11289 11291 11301-11304 11306-11307 11342 11364-11366 11374-11375 11452 11468 11488 11788 11792 118081.1131796728038537e-25 1.1131796728038537e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/598/A104?format=asciiRadiodefaultJ/A+A/598/A104/lotssFull source catalogue of LoTSS PDR 120-168MHz sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintILTILT name without prefix (JHHMMSS.S+DDMMSS.S) (1)meta.id;meta.maincharRAJ2000Centroid right ascension (J2000)degpos.eq.ra;meta.mainindexede_RAJ2000Statistical uncertainty on right ascension (1 sigma)arcsecstat.error;pos.eq.radoublee_RAdegtotTotal uncertainty on right ascension (1 sigma)arcsecstat.errordoubleDEJ2000Centroid declination (J2000)degpos.eq.dec;meta.mainindexede_DEJ2000Statistical uncertainty on declination (1 sigma)arcsecstat.error;pos.eq.decdoublee_DEdegtotTotal uncertainty on declination (1 sigma)arcsecstat.errordoubleFPeakPeak 120-168MHz brightnessmJy/beamphot.flux.density;em.radio.100-200MHzdoublee_FPeakStatistical error on peak brightness (1 sigma)mJy/beamstat.errordoublee_FPeaktotTotal error on peak brightness (1 sigma)mJy/beamstat.errordoubleFTotIntegrated 120-168MHz flux densitymJyphot.flux.density;em.radio.100-200MHzdoublee_FTotStatistical error on integrated flux densitymJystat.errordoublee_FTottotTotal error on integrated flux densitymJystat.errordoubleResolvedFlag indicating whether source is resolvedmeta.codecharIslrmsLocal image background RMS noisemJy/beaminstr.background;obs.image;pos.lgdoubleSCode[SCM] Source structure code (2)meta.codecharMosaicIDName of the parent mosaic image (3)obs.imagechar