J/A+A/691/A347ivo://CDS.VizieR/J/A+A/691/A347doi:10.26093/cds/vizier.36910347CDSYe H.Sweijen F.van Weeren R.J.Williams W.de Jong J.Morabito L.K.,Rottgering H.Shimwell T.W.Best P.N.Bondi M.Brueggen M.,de Gasperin F.Tasse C.2025-02-27T20:02:15Z2024-11-26T09:09:11ZCDS support team

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

cds-question@unistra.frsurveysradio-continuum-emissioninterferometryWe present the first wide area (2.5x2.5deg^2^) LOFAR High Band Antenna image at a resolution of 1.2arcsecx2arcsec with a median noise of approximately 80 microJy per beam. It was made from an 8-hour International LOFAR Telescope (ILT) observation of the ELAIS-N1 field at frequencies ranging from 120 to 168MHz with the most up-to-date ILT imaging methods. This intermediate resolution falls between the highest possible resolution (0.3arcsec) achievable by using all International LOFAR Telescope (ILT) baselines and the standard 6-arcsecond resolution in the LoTSS (LOFAR Two-meter Sky Survey) image products utilizing the LOFAR Dutch baselines only. This is the first demonstration of the feasibility of imaging using the ILT at a resolution of around 1 arcsec, which provides unique information on source morphology at scales that fall below the surface brightness limits at higher resolutions. The total calibration and imaging computational time is approximately 52000 core hours, nearly 5 times more than required to produce a 6 arcsec resolution image. We also present a radio source catalogue containing 2263 sources detected over the 2.5x2.5deg^2^ image of the ELAIS-N1 field, with a peak intensity threshold of 5.5 sigma. The catalogue has been cross-matched with the LoTSS deep ELAIS-N1 field radio catalogue, and its flux density and positional accuracy have been investigated and corrected accordingly. We find that approximately 80% of sources which we expect to be detectable based on their peak brightness in the LoTSS 6 arcsec resolution image are detected in this image, which is approximately a factor of two higher than for 0.3 arcsec resolution imaging in the Lockman Hole, implying there is a wealth of information on these intermediate scales.2024A&A...691A.347Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/691/A347CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/648/A2 : LOFAR Two-metre Sky Survey Deep Fields DR1 (Sabater+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/691/A347https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/691/A347http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/691/A347https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/691/A347https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/691/A347http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/691/A347GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/691/A347/table2 (ILT 1arcsec Elais-N1 final catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/691/A347/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/691/A347/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/691/A347/table2?GETtext/xml+votable180.050000true243.051322706644355.38437348812550.0055555555555555565/2538-2539 6/10147-10148 10150 11520-11521 11523-115249.54153977050123e-26 9.54153977050123e-26https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/691/A347?format=asciiRadiodefaultJ/A+A/691/A347/table2ILT 1arcsec Elais-N1 final catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (Source_name)meta.id;meta.maincharRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.maine_RAJ2000Right ascension uncertainty (E_RA)degstat.error;pos.eq.radoubleDEJ2000Declination (DEC)degpos.eq.dec;meta.maine_DEJ2000Declination uncertainty (E_DEC)degstat.error;pos.eq.decdoubleFtotIntegrated source flux density at 144MHz (Total_flux)mJyphot.flux.density;em.radio.100-200MHzdoublePAPosition angle (PA) (1)degpos.posAngdoublee_FtotIntegrated source flux density at 144MHz uncertainty (E_Total_flux)mJystat.errordoubleFpeakPeak intensity at 144MHz (Peak_flux)mJy/beamphot.flux.density;em.radio.100-200MHzdoublee_FpeakPeak intensity uncertainty at 144MHz (E_Peak_flux)mJy/beamstat.errordoubleMajDeconvolved major-axis (Maj) (1)arcsecphys.angSizedoublee_MajDeconvolved major-axis uncertainty (E_Maj)arcsecstat.errordoubleMinDeconvolved minor-axis (Min) (1)arcsecphys.angSize;srcdoublee_MinDeconvolved minor-axis uncertainty (E_Min)arcsecstat.error;stat.mindoublee_PAPosition angle uncertainty (E_PA)degstat.errordouble