J/A+A/674/A189ivo://CDS.VizieR/J/A+A/674/A189doi:10.26093/cds/vizier.36740189CDSBoehme L.Schwarz D.J.de Gasperin F.Roettgering H.J.A.Williams W.L.2024-11-06T20:04:31Z2023-06-22T08:19:38ZCDS support team

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

cds-question@unistra.frradio-galaxiesradio-continuum-emissionWith the recent preliminary release of the LOFAR LBA Sky Survey (LoLSS), the first wide-area, ultra-low frequency observations from LOFAR were published. Our aim is to combine this dataset with other surveys at higher frequencies to study the spectral properties of a large sample of radio sources. We present a new cross-matching algorithm taking into account the sizes of the radio sources and apply it to the LoLSS-PR, LoTSS-DR1, LoTSS-DR2 (all LOFAR), TGSS-ADR1 (GMRT), WENSS (WSRT) and NVSS (VLA) catalogues. We then study the number of matched counterparts for LoLSS radio sources and their spectral properties. We find counterparts for 22 607 (89.5%) LoLSS sources. The remaining 2 640 sources (10.5%) are identified either as an artefact in the LoLSS survey (3.6%) or flagged due to their closeness to bright sources (6.9%). We find an average spectral index of {alpha}=-0.77+/-0.18 between LoLSS and NVSS. Between LoLSS and LoTSS-DR2 we find {alpha}=-0.71+/-0.31. The average spectral index is flux density independent above S_54_=181mJy. Comparison of the spectral slopes from LoLSS-LoTSS-DR2 with LoTSS-DR2-NVSS indicates that the probed population of radio sources exhibits evidence for a negative spectral curvature.2023A&A...674A.189Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/674/A189CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/62 : The Westerbork Northern Sky Survey (Leiden, 1998)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/A+A/655/A40 : LoLSS-Deep Bootes 54MHz catalog (Williams+, 2021)J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017)J/A+A/598/A104 : LOFAR Two-metre Sky Survey (Shimwell+, 2017)J/A+A/622/A1 : LOFAR Two-metre Sky Survey (LoTSS) DR1 (Shimwell+, 2019)J/A+A/659/A1 : LOFAR Two-metre Sky Survey (LoTSS) DR2 (Shimwell+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/674/A189https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/674/A189http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/674/A189https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/674/A189https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/674/A189http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/674/A189GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/674/A189/c_match (Whole cross-matching catalogue (table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/674/A189/c_match?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/674/A189/c_match?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/674/A189/c_match?GETtext/xml+votable180.050000true160.457067635773346.56265897881950.005555555555555556Cone search capability for table J/A+A/674/A189/hzrg (High-redshift radio galaxy candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/674/A189/hzrg?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/674/A189/hzrg?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/674/A189/hzrg?GETtext/xml+votable180.050000true168.6673960.258780.005555555555555556Cone search capability for table J/A+A/674/A189/uss (Ultra-steep spectrum sources (alpha less than -2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/674/A189/uss?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/674/A189/uss?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/674/A189/uss?GETtext/xml+votable180.050000true162.7294549.121420.005555555555555556Cone search capability for table J/A+A/674/A189/steep_z (High-redshift (z greater than 2) and steep spectrum (alpha less than -1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/674/A189/steep_z?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/674/A189/steep_z?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/674/A189/steep_z?GETtext/xml+votable180.050000true173.2786549.218370.0055555555555555563/93 173-174 178 4/349-351 369 380-381 622 669-671 685-687 689-691 700-702 705-710 716 736-737 5/1373-1375 1389 1391 1393 1395 1485 1529 2479 2483 2486 2492 2494-2495 2655 2671 2674-2675 2719 2735 2739 2753 2755 2819 2844 2846 2868 2870 2872-2874 2880 2952-2954 2956 2960 2976 6/5471 5491 5535 5555 5561-5563 5571 5577-5579 5893 5895 5901 5903 5936-5937 5948-5949 5951 6037 6112-6113 6115 6121 6124-6125 6128-6130 6132 6136 9909-9911 9913-9915 9926-9927 9929-9931 9936 9938-9939 9974-9975 10154 10613-10615 10617-10619 10655 10671 10677-10679 10681-10683 10693-10695 10847 10863 10867 10869-10871 10873-10875 10911 10931 10933-10935 10937-10939 10949-10951 10953-10955 11017-11019 11248-11250 11269-11271 11273-11275 11380-11382 11500-11502 11504-11506 11512 11528 11530 11820-11822 11828 11832 11844 11848 11908 11912https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/674/A189?format=asciiRadiodefaultJ/A+A/674/A189/c_matchWhole cross-matching catalogue (table 2)SpILG? Spectral index between LoLSS and TGSS (Spidx_LG)spect.indexdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000LoLSS position (J2000) (RA)degpos.eq.ra;meta.mainindexedDEJ2000LoLSS position (J2000) (Dec)degpos.eq.dec;meta.mainindexedFluxLoLSSSum of detection fluxes (Flux_LoLSS)mJyphot.flux.density;em.radio.20-100MHzdoublee_FluxLoLSSSum of detection flux errors (e_Flux_LoLSS)mJystat.errordoublePeakFluxLoLSSMax of detection peak fluxes (Peak_Flux_LoLSS)mJy/beamphot.flux.density;em.radio.20-100MHzdoublee_PeakFluxLoLSSMax of detection peak flux errors (e_Peak_Flux_LoLSS)mJy/beamstat.errordoublermsLoLSSLocal rms noise (Rms_LoLSS)mJy/beaminstr.det.noisedoubleFluxLoTSS1? Sum of detection fluxes (Flux_LoTSS1)mJyphot.flux.density;em.radio.100-200MHzdoublenullablee_FluxLoTSS1? Sum of detection flux errors (e_Flux_LoTSS1)mJystat.errordoublenullablePeakFluxLoTSS1? Max of detection peak fluxes (Peak_Flux_LoTSS1)mJy/beamphot.flux.density;em.radio.100-200MHzdoublenullablee_PeakFluxLoTSS1? Max of detection peak flux errors (e_Peak_Flux_LoTSS1)mJy/beamstat.errordoublenullablermsLoTSS1? Local rms noise (Rms_LoTSS1)mJy/beaminstr.det.noisedoublenullableFluxLoTSS2? Sum of detection fluxes (Flux_LoTSS2)mJyphot.flux.density;em.radio.100-200MHzdoublenullablee_FluxLoTSS2? Sum of detection flux errors (e_Flux_LoTSS2)mJystat.errordoublenullablePeakFluxLoTSS2? Max of detection peak fluxes (Peak_Flux_LoTSS2)mJy/beamphot.flux.density;em.radio.100-200MHzdoublenullablee_PeakFluxLoTSS2? Max of detection peak flux errors (e_Peak_Flux_LoTSS2)mJy/beamstat.errordoublenullablermsLoTSS2? Local rms noise (Rms_LoTSS2)mJy/beaminstr.det.noisedoublenullableFluxTGSS? Sum of detection fluxes (Flux_TGSS)mJyphot.flux.density;em.radio.100-200MHzdoublenullablee_FluxTGSS? Sum of detection flux errors (e_Flux_TGSS)mJystat.errordoublenullablePeakFluxTGSS? Max of detection peak fluxes (Peak_Flux_TGSS)mJy/beamphot.flux.density;em.radio.100-200MHzdoublenullablee_PeakFluxTGSS? Max of detection peak flux errors (e_Peak_Flux_TGSS)mJy/beamstat.errordoublenullablermsTGSS? Local rms noise (Rms_TGSS)mJy/beaminstr.det.noisedoublenullableFluxWENSS? Sum of detection fluxes (Flux_WENSS)mJyphot.flux.density;em.radio.200-400MHzfloatnullablee_FluxWENSS? Sum of detection flux errors (e_Flux_WENSS)mJystat.errorcharPeakFluxWENSS? Max of detection peak fluxes (Peak_Flux_WENSS)mJy/beamphot.flux.density;em.radio.200-400MHzfloatnullablee_PeakFluxWENSS? Max of detection peak flux errors (e_Peak_Flux_WENSS)mJy/beamstat.errorcharrmsWENSS? Local rms noise (Rms_WENSS)mJy/beaminstr.det.noisedoublenullableFluxNVSS? Sum of detection fluxes (Flux_NVSS)mJyphot.flux.density;em.radio.750-1500MHzfloatnullablee_FluxNVSS? Sum of detection flux errors (e_Flux_NVSS)mJystat.errorfloatnullablePeakFluxNVSS? Max of detection peak fluxes (Peak_Flux_NVSS)mJy/beamphot.flux.density;em.radio.750-1500MHzdoublenullablee_PeakFluxNVSS? Max of detection peak flux errors (e_Peak_Flux_NVSS)mJy/beamstat.errorcharrmsNVSS? Local rms noise (Rms_NVSS)mJy/beaminstr.det.noisedoublenullableSpILT1? Spectral index between LoLSS and LoTSS-DR1 (Spidx_LT1)spect.indexdoublenullableSpILT2? Spectral index between LoLSS and LoTSS-DR2 (Spidx_LT2)spect.indexdoublenullableSpILW? Spectral index between LoLSS and WENSS (Spidx_LW)spect.indexdoublenullableSpILN? Spectral index between LoLSS and NVSS (Spidx_LN)spect.indexdoublenullableScode[SMA] (S)ingle, (M)ultiple, (A)rtefact/Close to bright (Scode)meta.codecharNumMatchT1[0/6] Number of LoTSS-DR1 counterparts (Num_match_T1)meta.numberintSourceIdT1Array of source IDs with NumMatchT1 entries (Source_id_T1)meta.idcharNumMatchT2[0/9] Number of LoTSS-DR2 counterparts (Num_match_T2)meta.numberintSourceIdT2Array of source IDs with NumMatchT2 entries (Source_id_T2)meta.idcharNumMatchG[0/3] Number of TGSS counterparts (Num_match_G)meta.numberintSourceIdGArray of source IDs with NumMatchG entries (Source_id_G)meta.idcharNumMatchW[0/5] Number of WENSS counterparts (Num_match_W)meta.numberintSourceIdWArray of source IDs with NumMatchW entries (Source_id_W)meta.idcharNumMatchN[0/4] Number of NVSS counterparts (Num_match_N)meta.numberintSourceIdNArray of source IDs with NumMatchN entries (Source_id_N)meta.idcharLoLSSLoLSS source identification, LOLpJHHMMSS.s+DDMMSS (SourceIdL)meta.id;meta.maincharJ/A+A/674/A189/hzrgHigh-redshift radio galaxy candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSpIndexSpectral Index between LoLSS and LoTSS-DR2spect.indexfloatJ/A+A/674/A189/ussUltra-steep spectrum sources (alpha less than -2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSpIndexSpectral Index between LoLSS and LoTSS-DR2spect.indexfloatJ/A+A/674/A189/steep_zHigh-redshift (z greater than 2) and steep spectrum (alpha less than -1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSpIndexSpectral Index between LoLSS and LoTSS-DR2spect.indexfloatzRedshift from LoTSS-DR1 value-added cataloguesrc.redshiftfloat