J/AJ/129/2542ivo://CDS.VizieR/J/AJ/129/2542doi:10.26093/cds/vizier.51292542CDSCollinge M.J.Strauss M.A.Hall P.B.Ivezic Z.Munn J.A.,Schlegel D.J.Zakamska N.L.Anderson S.F.Harris H.C.Richards G.T.,Schneider D.P.Voges W.York D.G.Margon B.Brinkmann J.2017-06-01T08:52:36Z2006-04-20T22:29:00ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsvisible-astronomysloan-photometryredshiftedproper-motionsradio-astronomyWe present a sample of 386 BL Lacertae candidates identified from 2860deg^2^ of the Sloan Digital Sky Survey (SDSS) spectroscopic database. The candidates are primarily selected to have quasi-featureless optical spectra and low proper motions as measured from SDSS and USNO-B positions; however, our ability to separate Galactic from extragalactic quasi-featureless objects (QFOs) on the basis of proper motion alone is limited by the lack of reliable proper motion measurements for faint objects. Based largely on this remarkably clean color separation, we subdivide the sample into 240 probable candidates and 146 additional less probable (likely stellar) candidates.2005AJ....129.2542Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/129/2542CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/241 : Spectroscopy of SDSS Data Release 3 (SDSS-DR3) (ARC, 2005)http://www.sdss.org/ : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/129/2542https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/129/2542http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/129/2542https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/129/2542https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/129/2542http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/129/2542GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/129/2542/proBL (Probable BL Lac candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/129/2542/proBL?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/129/2542/proBL?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/129/2542/proBL?GETtext/xml+votable180.050000true20.614083315.17308330.005555555555555556Cone search capability for table J/AJ/129/2542/posBL (Possible BL Lac candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/129/2542/posBL?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/129/2542/posBL?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/129/2542/posBL?GETtext/xml+votable180.050000true29.0175-1.00805560.005555555555555556Cone search capability for table J/AJ/129/2542/table5 (Potential radio-weak BL Lac candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/129/2542/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/129/2542/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/129/2542/table5?GETtext/xml+votable180.050000true10.2277083-9.25744440.0055555555555555566/4108 7490 10219 11176 11253 11460 11832 11915 12546 17239 17516 17553 17602 17745 17749 17754 17755 17771 17805 17814 17817 17820 17822 17835 17858 18005 18407 18837 19110 19412 19993 23054 23185 23190 26067 26998 31424 36728 36729 36779 36784 36817 490102.040811542443644e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/129/2542?format=asciiOpticalRadiodefaultJ/AJ/129/2542/proBLProbable BL Lac candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharn_SDSS[*] *: SDSS data using DR2 reductions were not available for the object (G1)meta.notecharumagSDSS u magnitudemagphot.mag;em.opt.Ufloate_umagrms uncertainty on umagmagstat.error;phot.magfloatgmagSDSS g magnitudemagphot.mag;em.opt.Bfloate_gmagrms uncertainty on gmagmagstat.error;phot.magfloatrmagSDSS r magnitudemagphot.mag;em.opt.Rfloate_rmagrms uncertainty on rmagmagstat.error;phot.magfloatimagSDSS i magnitudemagphot.mag;em.opt.Ifloate_imagrms uncertainty on imagmagstat.error;phot.magfloatzmagSDSS z magnitudemagphot.mag;em.opt.Ifloate_zmagrms uncertainty on zmagmagstat.error;phot.magfloatArAbsorption in rband (1)magphys.absorptionfloatMorph[pr] Optical morphology (G2)src.class.starGalaxycharTargetTarget code (2)meta.idlongl_z[>= ] Limit flag on zmeta.code.error;src.redshiftcharz? Redshiftsrc.redshiftfloatnullableu_z[?] Uncertainty flag on zmeta.code.error;src.redshiftcharpm? Proper motionmas/yrpos.pmfloatnullableu_pm[?] Uncertainty flag on pmmeta.code.errorcharIdent[Y/N] Previously reported in NED as a BL Lac object ?meta.notecharSDSSdataDisplay the SDSS data for this objectmeta.ref.urlcharNHHydrogen column density1e+20cm**-2phys.columnDensityfloatXray[BFU] X-ray match (1)meta.notecharSep1? RASS Separationarcsecpos.angDistancefloatnullablel_CRLimit flag on CRmeta.code.errorcharCRRASS Count ratect/sphot.count;em.X-rayfloate_CR? rms uncertainty on CRct/sstat.errorfloatnullableExpRASS Exposition timestime.duration;obs.exposurefloatl_F1keVLimit flag on F1keVmeta.code.errorcharF1keVEnergy flux at 1keV1e-16W.m**-2.keV**-1phot.flux;em.X-rayfloatl_FXLimit flag on FXmeta.code.errorcharFXRASS X-ray flux1e-16W.m**-2phot.flux;em.X-rayfloatSep2? FIRST separationarcsecpos.angDistancefloatnullablel_F1.4GHzLimit flag on F1.4GHzmeta.code.errorcharF1.4GHz? FIRST flux at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzfloatnullablerms? FIRST rms level appropriate to the object's coordinatesmJyinstr.det.noisefloatnullableSep3? NVSS separationarcsecpos.angDistancefloatnullableF1.4GHz2? NVSS flux at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzfloatnullablee_F1.4GHz2? rms uncertainty on F1.4GHz2mJystat.errorfloatnullablel_alphaOXLimit flag on alphaOXmeta.code.errorcharalphaOXSpectral index between optical and X-rayspect.indexfloatl_alphaROLimit flag on alphaROmeta.code.errorcharalphaRO? Spectral index between radio and opticalspect.indexfloatnullableRadioShow nearby FIRST/NVSS sources (up to 10'')meta.ref.urlchar_RAPosition derived from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition derived from SDSS name (declination part)degpos.eq.dec;meta.mainJ/AJ/129/2542/posBLPossible BL Lac candidatesz? Redshiftsrc.redshiftfloatnullableTargetTarget code (2)meta.idlongrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharn_SDSS[*] *: SDSS data using DR2 reductions were not available for the object (G1)meta.notecharumagSDSS u magnitudemagphot.mag;em.opt.Ufloate_umagrms uncertainty on umagmagstat.error;phot.magfloatgmagSDSS g magnitudemagphot.mag;em.opt.Bfloate_gmagrms uncertainty on gmagmagstat.error;phot.magfloatrmagSDSS r magnitudemagphot.mag;em.opt.Rfloate_rmagrms uncertainty on rmagmagstat.error;phot.magfloatimagSDSS i magnitudemagphot.mag;em.opt.Ifloate_imagrms uncertainty on imagmagstat.error;phot.magfloatzmagSDSS z magnitudemagphot.mag;em.opt.Ifloate_zmagrms uncertainty on zmagmagstat.error;phot.magfloatArAbsorption in rband (1)magphys.absorptionfloatMorph[pr] Optical morphology (G2)src.class.starGalaxycharl_z[>= ] Limit flag on zmeta.code.error;src.redshiftcharu_z[?] Uncertainty flag on zmeta.code.error;src.redshiftcharpm? Proper motionmas/yrpos.pmfloatnullableu_pm[?] Uncertainty flag on pmmeta.code.errorcharIdent[Y/N] Previously reported in NED as a BL Lac object ?meta.notecharSDSSdataDisplay the SDSS data for this objectmeta.ref.urlcharNHHydrogen column density1e+20cm**-2phys.columnDensityfloatXray[BFU] X-ray match (1)meta.notecharSep1? RASS Separationarcsecpos.angDistancefloatnullablel_CRLimit flag on CRmeta.code.errorcharCRRASS Count ratect/sphot.count;em.X-rayfloate_CR? rms uncertainty on CRct/sstat.errorfloatnullableExpRASS Exposition timestime.duration;obs.exposurefloatl_F1keVLimit flag on F1keVmeta.code.errorcharF1keVEnergy flux at 1keV1e-16W.m**-2.keV**-1phot.flux;em.X-rayfloatl_FXLimit flag on FXmeta.code.errorcharFXRASS X-ray flux1e-16W.m**-2phot.flux;em.X-rayfloatSep2? FIRST separationarcsecpos.angDistancefloatnullablel_F1.4GHzLimit flag on F1.4GHzmeta.code.errorcharF1.4GHz? FIRST flux at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzfloatnullablerms? FIRST rms level appropriate to the object's coordinatesmJyinstr.det.noisefloatnullableSep3? NVSS separationarcsecpos.angDistancefloatnullableF1.4GHz2? NVSS flux at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzfloatnullablee_F1.4GHz2? rms uncertainty on F1.4GHz2mJystat.errorfloatnullablel_alphaOXLimit flag on alphaOXmeta.code.errorcharalphaOXSpectral index between optical and X-rayspect.indexfloatl_alphaROLimit flag on alphaROmeta.code.errorcharalphaRO? Spectral index between radio and opticalspect.indexfloatnullableRadioShow nearby FIRST/NVSS sources (up to 10'')meta.ref.urlchar_RAPosition derived from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition derived from SDSS name (declination part)degpos.eq.dec;meta.mainJ/AJ/129/2542/table5Potential radio-weak BL Lac candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharn_SDSS[*] *: SDSS data using DR2 reductions were not available for the object (G1)meta.notecharMorph[pr] Optical morphology (G2)src.class.starGalaxycharl_z[>= ] Limit flag on zmeta.code.error;src.redshiftcharz? Redshiftsrc.redshiftfloatnullableu_z[?] Uncertainty flag on zmeta.code.error;src.redshiftcharpm? Proper motionmas/yrpos.pmfloatnullableu_pm[?] Uncertainty flag on pmmeta.code.errorcharl_alphaOXLimit flag on alphaOXmeta.code.errorcharalphaOXSpectral index between optical and X-rayspect.indexfloatl_alphaROLimit flag on alphaROmeta.code.errorcharalphaRO? Spectral index between radio and opticalspect.indexfloatnullablel_logL5GHzLimit flag on logL5GHzmeta.code.errorcharlogL5GHz? Luminosity at 5GHzlog(1e-07W.Hz**-1)phys.luminosity;em.radio.3-6GHzfloatnullableSDSSdataDisplay the SDSS data for this objectmeta.ref.urlchar_RAPosition derived from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition derived from SDSS name (declination part)degpos.eq.dec;meta.main