J/A+A/622/A1ivo://CDS.VizieR/J/A+A/622/A1doi:10.26093/cds/vizier.36220001CDSShimwell T.W.Tasse C.Hardcastle M.J.Mechev A.P.Williams W.L.,Best P.N.Rottgering 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.Bruggen M.Brunetti G.,Chyzy 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.Orru 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.Genova-santos R.T.Goyal A.Gurkan 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-wroczynski B.O'sullivan S.P.Quinn J.Reich W.Roskowinski 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.Wilber A.2019-07-26T09:57:45Z2019-06-13T21:50:17ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesThe LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168MHz 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{deg}00'00'' to 57{deg}00'00'') were mapped using a fully automated direction-dependent calibration and imaging pipeline that we developed. A total of 325694 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_144MHz_=71{mu}Jy/beam and the point-source completeness is 90% at an integrated flux density of 0.45mJy. 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.2019A&A...622A...1Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/622/A1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/622/A4 : LOFAR observations XMM-LSS field (Hale+, 2019)J/A+A/622/A8 : NGC 3184, 4736, 5055 and 5194 LOFAR + WSRT maps (Heesen+, 2019)J/A+A/622/A11 : LoTSS/HETDEX. Optical quasars. I. (Guerkan+, 2019)J/A+A/622/A13 : VLA double-double radio galaxy candidates imagesJ/A+A/622/A15 : Broad absorption line quasars in LDR1 (Morabito+, 2019)J/A+A/622/A22 : Abell 1914 multiwavelength radio images (Mandal+, 2019)J/A+A/622/A23 : LoTSS HCG and MLCG systems (Nikiel-wroczynski+, 2019)J/A+A/623/A71 : LOTSS HETDEX Faraday depth cube (Van Eck+, 2019)https://lofar-surveys.org/releases.html : LOFAR Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/622/A1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/622/A1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/622/A1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/622/A1https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/622/A1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/622/A1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/622/A1/lotssdr1 (LoTSS-DR1 source catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A1/lotssdr1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A1/lotssdr1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A1/lotssdr1?GETtext/xml+votable180.050000true185.285249.2280.005555555555555556Cone search capability for table J/A+A/622/A1/merge (Value added radio source catalogue of LoTSS-DR1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A1/merge?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A1/merge?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A1/merge?GETtext/xml+votable180.050000true160.852552.16130.0055555555555555564/349-351 369 372-374 669-671 685-687 689-694 696-698 706-707 713 5/1375 1391 1395 1485 1487 1500 1509 1511 1520 2655 2671 2675 2735 2739 2780 2796 2800 2819 2822-2823 2834 2840 2842 2848-2849 2851 2857-2860 2864 2944 6/5495 5499 5559 5563 5575 5937 5939 5945 5947 6004 6008 6033 6084 6088 10615 10617-10619 10677 10679 10683 10694-10695 10698-10699 10935 10939 10951 10955 11015 11019 11021-11023 11124 11128 11188 11192 11204 11208 11270-11271 11275 11282-11283 11286-11287 11330 11342 11364 11366 11372 11400-11401 11403 11425-11427 11444-11446 11448 11450 11464-11466 11780 11782 11784 11786-2.439715709817298e-18 2.903888696868909e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/622/A1?format=asciiRadiodefaultJ/A+A/622/A1/lotssdr1LoTSS-DR1 source catalogueMosaicMosaic identifiermeta.idcharTypeType of source as classified by PyBDSF (G1)src.classcharrmsLocal noise at the position of the sourcemJy/beamstat.stdev;instr.det.noisefloatNpointNumber of pointingmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name (ILTJHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexede_RAJ2000rms uncertainty on RAarcsecstat.error;pos.eq.rafloate_RAdegTotTotal rms uncertainty on RAarcsecstat.errorfloatDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexede_DEJ2000rms uncertainty on DEarcsecstat.error;pos.eq.decfloate_DEdegTotTotal rms uncertainty on DEarcsecstat.errorfloatSpeakPeak flux at 120-168MHzmJy/beamphot.flux.density;em.radio.100-200MHz;stat.maxfloate_Speakrms uncertainty on peak fluxmJy/beamstat.errorfloate_SpeakTotTotal rms uncertainty on peak fluxmJy/beamstat.errorfloatSintTotal flux at 120-168MHzmJyphot.flux.density;em.radio.100-200MHzfloate_Sintrms uncertainty on total fluxmJystat.errorfloate_SintTotTotal rms uncertainty on total fluxmJystat.errorfloatMajMajor axisarcsecphys.angSizefloate_Majrms uncertainty on major axisarcsecstat.errorfloatMinMinor axisarcsecphys.angSize;srcfloate_Minrms uncertainty on minor axisarcsecstat.error;stat.minfloatDCMajDeconvolved major axisarcsecphys.angSizefloate_DCMajrms uncertainty on deconvolved major axisarcsecstat.errorfloatDCMinDeconvolved minor axisarcsecphys.angSize;srcfloate_DCMinrms uncertainty on deconvolved minor axisarcsecstat.errorfloatPAPosition angledegpos.posAngfloate_PArms uncertainty on position angledegstat.errorfloatDCPADeconvolved on position angledegpos.posAngfloate_DCPArms uncertainty on deconvolved position angledegstat.errorfloatJ/A+A/622/A1/mergeValue added radio source catalogue of LoTSS-DR1PA? Position angle (PA)degpos.posAngfloatnullableSintTotal flux (Total_flux)mJyphot.flux.density;em.radio.100-200MHzfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name (ILTJHHMMSS.ss+DDMMSS.s) (Source_Name)meta.id;meta.maincharRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.mainindexede_RAJ2000rms uncertainty on RA (E_RA)arcsecstat.error;pos.eq.rafloatDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.mainindexede_DEJ2000rms uncertainty on DE (E_DEC)arcsecstat.error;pos.eq.decfloatSpeakPeak flux (Peak_flux)mJy/beamphot.flux.density;em.radio.100-200MHz;stat.maxfloate_Speakrms uncertainty on peak flux (E_Peak_flux)mJy/beamstat.errorfloate_Sintrms uncertainty on total flux (E_Total_flux)mJystat.errorfloatMaj? Major axis (Maj)arcsecphys.angSizefloatnullablee_Maj? rms uncertainty on major axis (E_Maj)arcsecstat.errorfloatnullableMin? Minor axis (Min)arcsecphys.angSize;srcfloatnullablee_Min? rms uncertainty on minor axis (E_Min)arcsecstat.error;stat.minfloatnullableDCMaj? Deconvolved major axis (DC_Maj)arcsecphys.angSizefloatnullablee_DCMaj? rms uncertainty on deconvolved major axis (E_DC_Maj)arcsecstat.errorfloatnullableDCMin? Deconvolved minor axis (DC_Min)arcsecphys.angSize;srcfloatnullablee_DCMin? rms uncertainty on deconvolved minor axis (E_DC_Min)arcsecstat.errorfloatnullablee_PA? rms uncertainty on position angle (E_PA)degstat.errorfloatnullableDCPA? Deconvolved on position angle (DC_PA)degpos.posAngfloatnullablee_DCPA? rms uncertainty on deconvolved position angle (E_DC_PA)degstat.errorfloatnullablermsLocal noise at the position of the source (Isl_rms)mJy/beamstat.stdev;instr.det.noisefloatTypeType of source as classified by PyBDSF (S_Code) (G1)src.classcharMosaicMosaic identifier (Mosaic_ID)meta.idcharMaskFrac? The fraction of the source that is in the CLEAN mask (Masked_Fraction)meta.codeintnullableIdflagFlag indicating the origin of the optical identification (ID_flag) (1)meta.codeintIdNamePanSTARRs, AllWISE, 2MASX or SDSS name of optical identification (ID_name)meta.idcharRAodeg? Right ascension of optical identification (J2000) (ID_ra)degpos.eq.ranullableDEodeg? Declination of optical identification (J2000) (ID_dec)degpos.eq.decnullableMLLR? Likelihood ratio from maximum likelihood analysis (ML_LR)stat.likelihood;arith.ratiodoublenullableLGZsize? Length of the largest diameter of the convex hull around the set of component elliptical Gaussians (LGZ_Size)arcsecphys.angSize;stat.maxfloatnullableLGZwidth? Twice the maximum perpendicular distance of points on the convex hull to the largest diameter line (LGZ_Width)arcsecpos.angDistancefloatnullableLGZPA? The position angle on the sky, measured east of north, of that largest diameter (LGZ_PA)degpos.posAng;obs.fieldfloatnullableLGZassoc? Number of sources in the LGZ association (LGZ_Assoc)meta.numberintnullableq_LGZassoc[0/1]? LGZ association quality flag (LGZ_Assoc_Qual)meta.code.qualfloatnullableq_IdName[0/1]? LGZ identification quality flag (LGZ_ID_Qual)meta.code.qualintnullableDeblendName of PyBDSF multiple Gaussian component source from which this source was deblended (Deblended_from)meta.idcharAllWISEName of the source in the AllWISE catalog (AllWISE)meta.idcharobjIDThe PanSTARRs object ID (objID)meta.idcharFgapf? PanSTARRs g-band forced aperture photometry flux (gFApFlux)uJyphot.flux.density;em.opt.Bdoublenullablee_Fgapf[]? PanSTARRs g-band forced aperture photometry flux error (gFApFluxErr)uJystat.errordoublenullablegmagapf? PanSTARRs g-band forced aperture photometry magnitude (gFApMag)magphot.mag;em.opt.Bfloatnullablee_gmagapf? PanSTARRs g-band forced aperture photometry magnitude error (gFApMagErr)magstat.errordoublenullableFrapf? PanSTARRs r-band forced aperture photometry flux (rFApFlux)uJyphot.flux.density;em.opt.Rdoublenullablee_Frapf[]? PanSTARRs r-band forced aperture photometry flux error (rFApFluxErr)uJystat.errordoublenullablermagapf? PanSTARRs r-band forced aperture photometry magnitude (rFApMag)magphot.mag;em.opt.Rfloatnullablee_rmagapf? PanSTARRs r-band forced aperture photometry magnitude error (rFApMagErr)magstat.errordoublenullableFiapf? PanSTARRs i-band forced aperture photometry flux (iFApFlux)uJyphot.flux.density;em.opt.Idoublenullablee_Fiapf[]? PanSTARRs i-band forced aperture photometry flux error (iFApFluxErr)uJystat.errordoublenullableimagapf? PanSTARRs i-band forced aperture photometry magnitude (iFApMag)magphot.mag;em.opt.Ifloatnullablee_imagapf? PanSTARRs i-band forced aperture photometry magnitude error (iFApMagErr)magstat.errordoublenullableFzapf? PanSTARRs z-band forced aperture photometry flux (zFApFlux)uJyphot.flux.density;em.opt.Idoublenullablee_Fzapf[]? PanSTARRs z-band forced aperture photometry flux error (zFApFluxErr)uJystat.errordoublenullablezmagapf? PanSTARRs z-band forced aperture photometry magnitude (zFApMag)magphot.mag;em.opt.Ifloatnullablee_zmagapf? PanSTARRs z-band forced aperture photometry magnitude error (zFApMagErr)magstat.errordoublenullableFyapf? PanSTARRs y-band forced aperture photometry flux (yFApFlux)uJyphot.flux.density;em.IR.Jdoublenullablee_Fyapf[]? PanSTARRs y-band forced aperture photometry flux error (yFApFluxErr)uJystat.errordoublenullableymagapf? PanSTARRs y-band forced aperture photometry magnitude (yFApMag)magphot.mag;em.IR.Jfloatnullablee_ymagapf? PanSTARRs y-band forced aperture photometry magnitude error (yFApMagErr)magstat.error;pos.cartesian.ydoublenullableFgKrf? PanSTARRs g-band forced photometry Kron flux (gFKronFlux)uJyphot.flux.density;em.opt.Bdoublenullablee_FgKrf[]? PanSTARRs g-band forced photometry Kron flux error (gFKronFluxErr)uJystat.errordoublenullablermagKrf? PanSTARRs r-band forced photometry Kron flux (rFKronFlux)magphot.mag;em.opt.Rdoublenullablee_rmagKrf[]? PanSTARRs r-band forced photometry Kron flux error (rFKronFluxErr)magstat.errordoublenullableFiKrf? PanSTARRs i-band forced photometry Kron flux (iFKronFlux)uJyphot.flux.density;em.opt.Idoublenullablee_FiKrf[]? PanSTARRs i-band forced photometry Kron flux error (iFKronFluxErr)uJystat.errordoublenullableFzKrf? PanSTARRs z-band forced photometry Kron flux (zFKronFlux)uJyphot.flux.density;em.opt.Idoublenullablee_FzKrf[]? PanSTARRs z-band forced photometry Kron flux error (zFKronFluxErr)uJystat.errordoublenullableFyKrf? PanSTARRs y-band forced photometry Kron flux (yFKronFlux)uJyphot.flux.density;em.IR.Jdoublenullablee_FyKrf[]? PanSTARRs y-band forced photometry Kron flux error (yFKronFluxErr)uJystat.errordoublenullableFW1pf? AllWISE W1 profile-fit photometry flux (w1Flux)uJyphot.mag;em.IR.3-4umdoublenullablee_FW1pf? AllWISE W1 profile-fit photometry flux error (w1FluxErr)uJystat.errordoublenullableW1magpf? AllWISE W1 profile-fit photometry magnitude (w1Mag)magphot.mag;em.IR.3-4umfloatnullablee_W1magpf? AllWISE W1 profile-fit photometry magnitude error (w1MagErr)magstat.errorfloatnullableFW2pf? AllWISE W2 profile-fit photometry flux (w2Flux)uJyphot.mag;em.IR.4-8umdoublenullablee_FW2pf? AllWISE W2 profile-fit photometry flux error (w2FluxErr)uJystat.errordoublenullableW2magpf? AllWISE W2 profile-fit photometry magnitude (w2Mag)magphot.mag;em.IR.4-8umfloatnullablee_W2magpf? AllWISE W2 profile-fit photometry magnitude error (w2MagErr)magstat.errorfloatnullableFW3pf? AllWISE W3 profile-fit photometry flux (w3Flux)uJyphot.flux.density;em.IR.8-15umdoublenullablee_FW3pf? AllWISE W3 profile-fit photometry flux error (w3FluxErr)uJystat.errordoublenullableW3magpf? AllWISE W3 profile-fit photometry magnitude (w3Mag)magphot.flux.density;em.IR.8-15umfloatnullablee_W3magpf? AllWISE W3 profile-fit photometry magnitude error (w3MagErr)magstat.errorfloatnullableFW4pf? AllWISE W4 profile-fit photometry flux (w4Flux)uJyphot.flux.density;em.IR.15-30umdoublenullablee_FW4pf? AllWISE W4 profile-fit photometry flux error (w4FluxErr)uJystat.errordoublenullableW4magpf? AllWISE W4 profile-fit photometry magnitude (w4Mag)magphot.flux.density;em.IR.15-30umfloatnullablee_W4magpf? AllWISE W4 profile-fit photometry magnitude error (w4MagErr)magstat.errorfloatnullablezbest? Best available redshift estimate (z_best)src.redshift;pos.heliocentricdoublenullablef_zbest[0/1]? Source of zbest (z_best_source) (2)meta.codeintnullablezsp? Literature Spectroscopic Redshift (z_spec)src.redshiftdoublenullabler_zsp[1/32]? Source of zsp (z_spec_source) (3)meta.ref;pos.frameintnullablez1med? Median of the primary redshift peak above 80% HPD CI (z1_median)src.redshift;pos.heliocentricdoublenullablez1min? Lower bound of the primary 80% HPD CI peak (z1_min)src.redshift;pos.heliocentricdoublenullablez1max? Upper bound of the primary 80% HPD CI peak (z1_max)src.redshift;pos.heliocentricdoublenullablez1area? Integrated area of the primary 80% HPD CI peak (z1_area)phys.angSizedoublenullablez2med? Median of the secondary redshift peak (if present) above 80% HPD CI (z2_median)src.redshift;pos.heliocentricdoublenullablez2min? Lower bound of the secondary 80% HPD CI peak (z2_min)src.redshift;pos.heliocentricdoublenullablez2max? Upper bound of the secondary 80% HPD CI peak (z2_max)src.redshift;pos.heliocentricdoublenullablez2area? Integrated area of the secondary 80% HPD CI peak (z2_area)phys.angSizedoublenullablefAGN[0/1]? Flag indicating spectroscopically identified AGN (specAGN)meta.codeintnullablefMQCc[0/1] Flag indicating source is included in Million Quasar Catalog compilation (mqcAGN)meta.idintXrayClass[0/2]? 2RXS or XMMSL2 X-ray source class (XrayClass) (4)meta.codeintnullable2RXSID in 2RXS catalog (if available) (2RXS_ID)meta.idcharXMMSL2ID in XMMSL2 catalog (XMMSL2_ID)meta.idcharIRClass? Bit-flag indicating WISE AGN Class (IRClass) (5)meta.codeintnullableE(B-V)? E(B-V) galactic extinction for the source (EBV) (6)magphot.color.excessdoublenullablemissingPS[0/1] Missing in PanSTARRS (PanSTARRS_missing)meta.codeintumag? Estimated rest frame u-band magnitude (for z_best) (u_rest)magphot.mag;em.opt.Udoublenullablegmag? Estimated rest frame g-band magnitude (for z_best) (g_rest)magphot.mag;em.opt.Bdoublenullablermag? Estimated rest frame r-band magnitude (for z_best) (r_rest)magphot.mag;em.opt.Rdoublenullableimag? Estimated rest frame i-band magnitude (for z_best) (i_rest)magphot.mag;em.opt.Idoublenullablezmag? Estimated rest frame z-band magnitude (for z_best) (z_rest)magphot.mag;em.opt.IdoublenullableUmag? Estimated rest frame U-band magnitude (for z_best) (U_rest)magphot.mag;em.opt.UdoublenullableBmag? Estimated rest frame B-band magnitude (for z_best) (B_rest)magphot.mag;em.opt.BdoublenullableVmag? Estimated rest frame V-band magnitude (for z_best) (V_rest)magphot.mag;em.opt.VdoublenullableImag? Estimated rest frame I-band magnitude (for z_best) (I_rest)magphot.mag;em.opt.IdoublenullableJmag? Estimated rest frame J-band magnitude (for z_best) (J_rest)magphot.mag;em.IR.JdoublenullableKsmag? Estimated rest frame Ks-band magnitude (for z_best) (Ks_rest)magphot.mag;em.IR.KdoublenullableW1mag? Estimated rest frame W1-band magnitude (for z_best) (w1_rest)magphot.mag;em.IR.3-4umdoublenullableW2mag? Estimated rest frame W2-band magnitude (for z_best) (w2_rest)magphot.mag;em.IR.4-8umdoublenullableW3mag? Estimated rest frame W3-band magnitude (for z_best) (w3_rest)magphot.flux.density;em.IR.8-15umdoublenullable