J/A+A/648/A2ivo://CDS.VizieR/J/A+A/648/A2doi:10.26093/cds/vizier.36480002CDSSabater J.Best P.N.Tasse C.Hardcastle M.J.Shimwell T.W.Nisbet D.,Jelic V.Callingham J.R.Roettgering H.J.A.Bonato M.Bondi M.,Ciardi B.Cochrane R.K.Jarvis M.J.Kondapally R.Koopmans L.V.E.,O'Sullivan S.P.Prandoni I.Schwarz D.J.Smith D.J.B.Wang L.,Williams W.L.Zaroubi S.2021-09-16T09:12:00Z2021-04-07T09:04:13ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesgalaxiescatalogsThe LOFAR Two-metre Sky Survey (LoTSS) will cover the full northern sky and, additionally, aims to observe the LoTSS deep fields to a noise level of <~10uJy/beam over several tens of square degrees in areas that have the most extensive ancillary data. This paper presents the ELAIS-N1 deep field, the deepest of the LoTSS deep fields to date. With an effective observing time of 163.7 hours, it reaches a root mean square (RMS) noise level of <~20uJy/beam in the central region (and below 30uJy/beam over 10 square degrees). The resolution is 6 arcsecs and 84862 radio sources were detected in the full area (68 square degrees) with 74127 sources in the highest quality area at less than 3 degrees from the pointing centre. The observation reaches a sky density of more than 5000 sources per square degree in the central region (5 square degrees).We present the calibration procedure, which addresses the special configuration of some observations and the extended bandwidth covered (115 to 177MHz; central frequency 146.2MHz) compared to standard LoTSS. We also describe the methods used to calibrate the flux density scale using cross-matching with sources detected by other radio surveys in the literature. We find the flux density uncertainty related to the flux density scale to be 6.5 per cent. By studying the variations of the flux density measurements between different epochs, we show that relative flux density calibration is reliable out to about a 3 degree radius, but that additional flux density uncertainty is present for all sources at about the 3 per cent level; this is likely to be associated with residual calibration errors, and is shown to be more significant in datasets with poorer ionosphere conditions. We also provide intra-band spectral indices, which can be useful to detect sources with unusual spectral properties. The final uncertainty in the flux densities is estimated to be 10 per cent for ELAIS-N1.2021A&A...648A...2Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/648/A2CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/648/A3 : LOFAR Two-metre Sky Survey Deep Fields DR1 (Kondapally+, 2021)J/A+A/648/A4 : LoTSS Deep Fields DR1 photometric redshifts (Duncan+, 2021)J/A+A/648/A9 : Lockman Hole Apertif map at 1.4GHz (Morganti+, 2021)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/648/A2https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/648/A2http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/648/A2https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/648/A2https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/648/A2http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/648/A2GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/648/A2/catalog (Deep radio catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/648/A2/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/648/A2/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/648/A2/catalog?GETtext/xml+votable180.050000true249.66575687926453.19116763095690.0055555555555555564/634 720 5/2493-2495 2529-2531 2534 2540 2542 2837 2839 2884 2888 6/9951 9971 10031 10115 10128 10130 10164 10166 10172 10174 11344-11345 11347 11353 11380-11381 11383 11544 11556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/648/A2?format=asciiRadiodefaultJ/A+A/648/A2/catalogDeep radio catalogRAMdegMaximun right ascension (J2000) (RA_max)degpos.eq.rae_RAMdegrms uncertainty on RAMdeg (E_RA_max)degstat.errordoubleDEMdegMaximun Declination (J2000) (DEC_max)degpos.eq.dece_DEMdegrms uncertainty on DEMdeg (E_DEC_max)degstat.errordoubleMajThe FWHM of the major axis of the source, including convolution with the 6-arcsec LOFAR beam (Maj)degphys.angSizedoublee_Majrms uncertainty on Maj (E_Maj)degstat.errordoubleMinThe FWHM of the minor axis of the source, including convolution with the 6-arcsec LOFAR beam (Min)degphys.angSizedoublee_Minrms uncertainty on Min (E_Min)degstat.error;stat.mindoublePAThe position angle of the major axis of the source measured east of north, including convolution with the 6-arcsec LOFAR beam (PA)degpos.posAngdoublee_PArms uncertainty on PA (E_PA)degstat.errordoubleMajIpThe FWHM of the major axis of the image plane (Maj_img_plane)degphys.angSizedoublee_MajIprms uncertainty on MajIp (E_Maj_img_plane)degstat.errordoubleMinIpThe FWHM of the minor axis of the image plane (Min_img_plane)degphys.angSizedoublee_MinIprms uncertainty on MinIp (E_Min_img_plane)degstat.errordoublePAIpThe position angle of the major axis of the image plane (PA_img_plane)degpos.posAngdoublee_PAIprms uncertainty on PAIp (E_PA_img_plane)degstat.errordoublee_DCMajrms uncertainty on DCMaj (E_DC_Maj)degstat.errordoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceIdSource identification number (Source_id)meta.id;meta.mainintIslIdIsland identification number (Isl_id)meta.idintRAJ2000Right ascension of radio source (J2000) (RA)degpos.eq.ra;meta.mainindexede_RAJ2000rms uncertainty on RAdeg (E_RA)degstat.error;pos.eq.radoubleDEJ2000Declination of radio source (J2000) (DEC)degpos.eq.dec;meta.mainindexede_DEJ2000rms uncertainty on DEdeg (E_DEC)degstat.error;pos.eq.decdoubleTotalFluxThe total, integrated Stokes I flux density of the source at the reference frequency (Total_flux)Jyphot.flux.density;em.radiodoublee_TotalFluxThe 1-sigma on the total flux density of the source (E_Total_flux)Jystat.errordoublePeakFluxThe peak Stokes I flux density per beam of the source (Peak_flux)Jy/beamphot.flux.density;em.radiodoublee_PeakFluxThe 1-sigma error on the peak flux density per beam of the source (E_Peak_flux)Jy/beamstat.errordoubleDCMajThe FWHM of the major axis of the source, after de-convolution with the 6-arcsec LOFAR beam (DC_Maj)degphys.angSizedoubleDCMinThe FWHM of the minor axis of the source, after de-convolution with the 6-arcsec LOFAR beam (DC_Min)degphys.angSizedoublee_DCMinrms uncertainty on DCMin (E_DC_Min)degstat.errordoubleDCPAThe position angle of the major axis of the source measured east of north, after de-convolution with the 6-arcsec (DC_PA)degpos.posAngdoublee_DCPArms uncertainty on DCPA (E_DC_PA)degstat.errordoubleDCMajIpThe FWHM of the major axis of the image plane, after de-convolution (DC_Maj_img_plane)degphys.angSizedoublee_DCMajIprms uncertainty on DCMajIp (E_DC_Maj_img_plane)degstat.errordoubleDCMinIpThe FWHM of the minor axis of the image plane, after de-convolution (DC_Min_img_plane)degphys.angSizedoublee_DCMinIprms uncertainty on DCMinIp (E_DC_Min_img_plane)degstat.errordoubleDCPAIpThe position angle of the major axis of the image plane, after de-convolution (DC_PA_img_plane)degpos.posAngdoublee_DCPAIprms uncertainty on DCPAIp (E_DC_PA_img_plane)degstat.errordoubleFtotIslIsland total flux (Isl_Total_flux)Jyphot.flux.density;em.radiodoublee_FtotIslrms uncertainty on FtotIsl (E_Isl_Total_flux)Jystat.errordoublermsIslIsland rms (Isl_rms)Jy/beamstat.errordoublemeanIsl[0] Island mean (Isl_mean)Jy/beamstat.errordoublermsIslResIsland rms residual (Resid_Isl_rms)Jy/beamstat.fit.residualdoublemeanIslResIsland mean residual (Resid_Isl_mean)Jy/beamstat.fit.residualdoubleSCode[SMC] A code that defines the source structure (S_Code) (1)meta.codechar