J/A+A/655/A40ivo://CDS.VizieR/J/A+A/655/A40doi:10.26093/cds/vizier.36550040CDSWilliams W.L.de Gasperin F.Hardcastle M.J.van Weeren R.Tasse C.,Shimwell T.W.Best P.N.Bonato M.Bondi M.Brueggen M.,Roettgering H.J.A.Smith D.J.B.2021-12-06T20:15:45Z2021-11-10T08:06:01ZCDS support team

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

cds-question@unistra.frradio-continuum-emissionradio-sourcesradio-galaxiesactive-galactic-nucleiWe present the first sub-mJy (~0.7mJy/beam) survey to be completed below 100 MHz, which is over an order of magnitude deeper than previously achieved for widefield imaging of any field at these low frequencies. The high-resolution (15x15arcsec) image of the Bootes field at 34-75MHz is made from 56 hours of observation with the LOw Frequency ARray (LOFAR) Low Band Antenna (LBA) system. We present a radio source catalogue containing 1,948 sources detected over an area of 23.6 sq. deg, with a peak flux density threshold of 5{sigma}. Using the available deep 144-MHz data, we identified 144-MHz counterparts to all the 54-MHz sources, and produced a matched catalogue within the deep optical coverage area containing 829 sources.2021A&A...655A..40Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/655/A40CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/793/82 : LOFAR Bootes and 3C295 field sources (van Weeren+, 2014)J/MNRAS/460/2385 : Bootes field LOFAR 150-MHz observations (Williams+, 2016)J/A+A/620/A74 : Bootes field deep LOFAR 150MHz imaginghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/655/A40https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/655/A40http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/655/A40https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/655/A40https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/655/A40http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/655/A40GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/655/A40/table2 (LBA deep survey data of the Bootes field at 54MHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/655/A40/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/655/A40/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/655/A40/table2?GETtext/xml+votable180.050000true217.360933.7350.005555555555555556Cone search capability for table J/A+A/655/A40/matched (Matched sources to the HBA catalogue at 144MHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/655/A40/matched?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/655/A40/matched?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/655/A40/matched?GETtext/xml+votable180.050000true217.360933.7350.005555555555555556Cone search capability for table J/A+A/655/A40/list (Information on fits image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/655/A40/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/655/A40/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/655/A40/list?GETtext/xml+votable180.050000true218.012534.275830.0055555555555555565/2285-2287 2628-2630 6/9133 9135 9138-9139 9186 9192 9194 10501 10503 10509 10524-10525 10560 105623.5780776607782883e-26 3.5780776607782883e-26https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/655/A40?format=asciiRadiodefaultJ/A+A/655/A40/table2LBA deep survey data of the Bootes field at 54MHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmatchindicates matched sources to the HBA catalogue at 144MHzmeta.ref.urlcharSourceSource Name in format LBABOOJhhmmss.ss+ddmmss.smeta.id;meta.maincharprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.maine_RAJ2000Error on the right ascensiondegstat.error;pos.eq.radoubleDEJ2000Declination (J2000)degpos.eq.dec;meta.maine_DEJ2000Error on the declinationdegstat.error;pos.eq.decdoubleFtotalIntegrated flux density at 54MHzJyphot.flux.density;em.radio.20-100MHzdoublee_FtotalError on the integrated flux densityJystat.errordoubleFpeakPeak brightness at 54MHz (affected by smearing)Jy/beamphot.flux.density;em.radio.20-100MHzdoublee_FpeakError on the peak brightnessJy/beamstat.errordoubleIslrmsLocal rms noiseJy/beaminstr.det.noisedoubleNgausNumber of Gaussian componentsmeta.numberintDCMajDeconvolved source size, major axisdegphys.angSizedoublee_DCMajError on the deconvolved major axis sizedegstat.errordoubleDCMinDeconvolved source size, minor axisdegphys.angSizedoublee_DCMinError on the deconvolved minor axis sizedegstat.errordoubleDCPADeconvolved position angledegpos.posAngfloate_DCPAError on the deconvolved position angledegstat.errordoubleJ/A+A/655/A40/matchedMatched sources to the HBA catalogue at 144MHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name in format LBABOOJhhmmss.ss+ddmmss.smeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.maine_RAJ2000Error on the right ascensiondegstat.error;pos.eq.radoubleDEJ2000Declination (J2000)degpos.eq.dec;meta.maine_DEJ2000Error on the declinationdegstat.error;pos.eq.decdoubleFtotalIntegrated flux density at 54MHzJyphot.flux.density;em.radio.20-100MHzdoublee_FtotalError on the integrated flux densityJystat.errordoubleFpeakPeak brightness at 54MHz (affected by smearing)Jy/beamphot.flux.density;em.radio.20-100MHzdoublee_FpeakError on the peak brightnessJy/beamstat.errordoubleIslrmsLocal rms noiseJy/beaminstr.det.noisedoubleNgausNumber of Gaussian componentsmeta.numberintSizeFinal source sizedegphys.angSizefloatWidthFinal source widthdegphys.angSizefloatAngleFinal source position angledegpos.posAngfloatFlagOpt[0/1] Boolean flag indicating whether source was within the deep optical coverage areameta.code.errorintHBADeepName of matched 144MHz HBA Deep source in format ILTJhhmmss.ss+ddmmss.smeta.idcharJ/A+A/655/A40/listInformation on fits imagerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datetime.epoch;obsnullableFreqObserved frequencyMHzem.freqfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar