J/A+A/622/A4ivo://CDS.VizieR/J/A+A/622/A4doi:10.26093/cds/vizier.36220004CDSHale C.L.Williams W.Jarvis M.J.Hardcastle M.J.Morabito L.K.,Shimwell T.W.Tasse C.Best P.N.Harwood J.J.Heywood I.Prandoni I.,Rottgering H.J.A.Sabater J.Smith D.J.B.van Weeren R.J.2019-02-25T14:22:29Z2019-02-21T17:00:26ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsradio-galaxiesgalaxy-classification-systemsWe present observations of the XMM Large-Scale Structure (XMM-LSS) field observed with the LOw Frequency ARray (LOFAR) at 120-168MHz. Centred at a J2000 declination of -4.5{deg}, this is a challenging field to observe with LOFAR because of its low elevation with respect to the array. The low elevation of this field reduces the effective collecting area of the telescope, thereby reducing sensitivity. This low elevation also causes the primary beam to be elongated in the north-south direction, which can introduce side lobes in the synthesised beam in this direction. However the XMM-LSS field is a key field to study because of the wealth of ancillary information, encompassing most of the electromagnetic spectrum. The field was observed for a total of 12 hours from three four-hour LOFAR tracks using the Dutch array. The final image presented encompasses ~27deg^2^, which is the region of the observations with a >50% primary beam response. Once combined, the observations reach a central rms of 280uJy/beam at 144MHz and have an angular resolution of 7.5x8.5". We present our catalogue of detected sources and investigate how our observations compare to previous radio observations. This includes investigating the flux scale calibration of these observations compared to previous measurements, the implied spectral indices of the sources, the observed source counts and corrections to obtain the true source counts, and finally the clustering of the observed radio sources.2019A&A...622A...4Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/622/A4CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/591/640 : XMM-LSS low-frequency radio counterparts (Cohen+, 2003)J/A+A/456/791 : XMM-LSS field at 74 and 325MHz (Tasse+, 2006)J/MNRAS/382/279 : XMM-LSS catalogue. Version I. (Pierre+, 2007)J/A+A/471/1105 : XMM-LSS at 240MHz and 610MHz (Tasse+, 2007)J/A+A/474/473 : XMM-LSS survey: AGN classifications (Garcet+, 2007)J/A+A/490/879 : XMM-LSS field optical identifications (Tasse+, 2008)J/MNRAS/401/294 : Optical identification of XMM-LSS sources (Stalin+, 2010)J/A+A/557/A81 : XMM-LSS field X-ray sources classification (Melnyk+, 2013)J/MNRAS/429/1652 : XMM-LSS catalogue. Version II. (Chiappetti+, 2013)J/A+A/622/A1 : LOFAR Two-metre Sky Survey DR1 source catalogJ/A+A/622/A8 : NGC 3184, 4736, 5055 & 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/A23 : LoTSS HCG and MLCG systems (Nikiel-wroczynski+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/622/A4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/622/A4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/622/A4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/622/A4https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/622/A4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/622/A4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/622/A4/lxmmmerg (*Catalogue with merged sources combined and artefacts removed.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A4/lxmmmerg?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A4/lxmmmerg?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A4/lxmmmerg?GETtext/xml+votable180.050000true37.13224611-4.7686750.005555555555555556Cone search capability for table J/A+A/622/A4/lxmmorig (*Original PyBDSF output catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/A4/lxmmorig?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/A4/lxmmorig?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/A4/lxmmorig?GETtext/xml+votable180.050000true37.13224611-4.7686750.0055555555555555565/4417 4419-4420 4422-4423 4428-4429 6/17665 17667 17673 17686 17700-17701 17703 17721 17724-17725 17738 17760 17762 17768 36782-367839.54153977050123e-26 9.54153977050123e-26https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/622/A4?format=asciiRadioOpticaldefaultJ/A+A/622/A4/lxmmmerg*Catalogue with merged sources combined and artefacts removed.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIAUsourceIDSource ID in IAU convention (IAU_Source_ID)meta.id;meta.maincharSourceID[0/3043] Source ID in catalogue (Source_ID)meta.idintPMSourceID[0/3165] Source ID from Original PyBDSF Catalogue (Pre_matched_Source_ID)meta.idcharRAJ2000Right ascension (J2000.0) (RA)degpos.eq.ra;meta.maine_RAJ2000Error in Right ascension (E_RA)degstat.error;pos.eq.radoubleDEJ2000Declination (J2000.0) (DEC)degpos.eq.dec;meta.maine_DEJ2000Error in Declination (E_DEC)degstat.error;pos.eq.decdoubleFTotalTotal Flux Density at 144MHz (Total_flux)mJyphot.flux.density;em.radio.100-200MHzdoublee_FTotalError in Total Flux Density at 144MHz (E_Total_flux)mJystat.errordoubleFPeakPeak Flux Density per beam at 144MHz (Peak_flux)mJy/beamphot.flux.density;em.radio.100-200MHzdoublee_FPeakError in Peak Flux Density per beam at 144MHz (E_Peak_flux)mJy/beamstat.errordoubleMaj? Major axis (Maj)arcsecphys.angSizedoublenullablee_Maj? Error in Major Axis (E_Maj)arcsecstat.errordoublenullableMin? Minor Axis (Min)arcsecphys.angSize;srcdoublenullablee_Min? Error in Minor axis (E_Min)arcsecstat.error;stat.mindoublenullablePA? Position Angle (PA)degpos.posAngdoublenullablee_PA? Error in Position Angle (E_PA)degstat.errordoublenullableDCMaj? Deconvolved Major axis (DC_Maj)arcsecphys.angSizedoublenullablee_DCMaj? Error in Deconvolved Major axis (E_DC_Maj)arcsecstat.errordoublenullableDCMin? Deconvolved Minor axis (DC_Min)arcsecphys.angSize;srcdoublenullablee_DCMin? Error in Deconvolved Minor axis (E_DC_Min)arcsecstat.errordoublenullableDCPA? Deconvolved Position Angle (DC_PA)degpos.posAngdoublenullablee_DCPA? Error in Deconvolved Position Angle (E_DC_PA)degstat.errordoublenullableCompSize? Size of composite sources (Composite_Size)arcsecphys.angSizedoublenullableNsourcesNumber of sources combined together (N_sources)meta.number;phys.atmol.numberintMatchID1? Matched component ID from original PyBDSF catalogue (Matched_ID_1)meta.idintnullableMatchID2? Matched component ID from original PyBDSF catalogue (Matched_ID_2)meta.idintnullableMatchID3? Matched component ID from original PyBDSF catalogue (Matched_ID_3)meta.idintnullableMatchID4? Matched component ID from original PyBDSF catalogue (Matched_ID_4)meta.idintnullableEdge[0/1] Flagged if near edge of field (1 = near edge) (Edge) (1)meta.codeintBright[0/1] Flagged if bright source with artefacts (1 = bright) (Bright) (2)meta.codeintrmscentralrms value in map at central position (rms_central)mJy/beamstat.errordoubleRAFdegRight ascension corrected to FIRST (RA_FIRST)degpos.eq.raDEFdegDeclination corrected to FIRST (DEC_FIRST)degpos.eq.decJ/A+A/622/A4/lxmmorig*Original PyBDSF output catalogueMajMajor axis (Maj)degphys.angSizedoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPMSourceID[0/3168] Source ID in catalogue (Source_ID)meta.idcharIslID[0/3191] Island ID in catalogue (Isl_ID)meta.idintRAJ2000Right ascension (J2000.0) (RA)degpos.eq.ra;meta.maine_RAJ2000Error in Right ascension (E_RA)degstat.error;pos.eq.radoubleDEJ2000Declination (J2000.0) (DEC)degpos.eq.dec;meta.maine_DEJ2000Error in Declination (E_DEC)degstat.error;pos.eq.decdoubleFTotalTotal Flux at 144MHz (Total_flux)Jyphot.flux.density;em.radio.100-200MHzdoublee_FTotalError in Total Flux at 144MHz (E_Total_flux)Jystat.errordoubleFPeakPeak Flux at 144MHz (Peak_flux)Jy/beamphot.flux.density;em.radio.100-200MHzdoublee_FPeakError in Peak Flux at 144MHz (E_Peak_flux)Jy/beamstat.errordoubleRAdegmaxRight ascension at the maximum of the source (J2000.0) (RA_max)degpos.eq.rae_RAdegmaxError in Right ascension at the maximum of the source (E_RA_max)degstat.errordoubleDEdegmaxDeclination at the maximum of the source (J2000.0) (DEC_max)degpos.eq.dece_DEdegmaxError in Declination at the maximum of the source (E_DEC_max)degstat.errordoublee_MajError in Major Axis (E_Maj)degstat.errordoubleMinMinor Axis (Min)degphys.angSizedoublee_MinError in Minor axis (E_Min)degstat.error;stat.mindoublePAPosition Angle (PA)degpos.posAngdoublee_PAError in Position Angle (E_PA)degstat.errordoubleMajimgplMajor axis--image plane (Maj_img_plane)degphys.angSizedoublee_MajimgplError in Major Axis--image plane (E_Maj_img_plane)degstat.errordoubleMinimgplMinor Axis--image plane (Min_img_plane)degphys.angSizedoublee_MinimgplError in Minor axis--image plane (E_Min_img_plane)degstat.errordoublePAimgplPosition Angle--image plane (PA_img_plane)degpos.posAngdoublee_PAimgplError in Position Angle--image plane (E_PA_img_plane)degstat.errordoubleDCMajDeconvolved Major axis (DC_Maj)degphys.angSizedoublee_DCMajError in Deconvolved Major axis (E_DC_Maj)degstat.errordoubleDCMinDeconvolved Minor axis (DC_Min)degphys.angSizedoublee_DCMinError in Deconvolved Minor axis (E_DC_Min)degstat.errordoubleDCPADeconvolved Position Angle (DC_PA)degpos.posAngdoublee_DCPAError in Deconvolved Position Angle (E_DC_PA)degstat.errordoubleDCMajimgplDeconvolved Major axis - image plane (DC_Maj_img_plane)degphys.angSize;obs.imagedoublee_DCMajimgplError in Deconvolved Major axis - image plane (E_DC_Maj_img_plane)degstat.errordoubleDCMinimgplDeconvolved Minor axis - image plane (DC_Min_img_plane)degphys.angSize;obs.imagedoublee_DCMinimgplError in Deconvolved Minor axis - image plane (E_DC_Min_img_plane)degstat.errordoubleDCPAimgplDeconvolved Position Angle - image plane (DC_PA_img_plane)degpos.posAngdoublee_DCPAimgplError in Deconvolved Position Angle-image plane (E_DC_PA_img_plane)degstat.errordoubleIslFTotalTotal Flux at 144MHz in the Island (Isl_Total_flux)Jyphot.flux.density;em.radio.100-200MHzdoublee_IslFTotalError in Total Flux in the Island (E_Isl_Total_flux)Jystat.errordoubleIslrmsAverage rms within island (Isl_rms)Jy/beamstat.errordoubleIslmean[0] Mean background within island (Isl_mean)Jy/beaminstr.backgrounddoubleResidIslrmsAverage residual rms within island (Resid_Isl_rms)Jy/beamstat.errordoubleResidIslmeanMean residual background within island (Resid_Isl_mean)Jy/beaminstr.backgrounddoubleSCode[SMN] Defines type of Source (S_Code) (1)meta.codechar