J/ApJS/207/16ivo://CDS.VizieR/J/ApJS/207/16doi:10.26093/cds/vizier.22070016CDSMassaro F.Paggi A.Errando M.D'Abrusco R.Masetti N.Tosti G.,Funk S.2017-09-27T05:55:40Z2013-10-07T09:42:37ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsgamma-ray-astronomyinfrared-photometryx-ray-sourcesredshiftedastronomical-object-identificationBL Lac objects are the most numerous class of extragalactic TeV-detected sources. One of the biggest difficulties in investigating their TeV emission is due to their limited number, since only 47 BL Lac objects are known to be TeV emitters. In this paper, we propose new criteria to select TeV BL Lac candidates based on infrared and X-ray observations. We apply our selection criteria to the BL Lac objects listed in the ROMA-BZCAT catalog (Cat. J/A+A/495/691), thereby identifying 41 potential TeV emitters. We then perform a search over a more extended sample combining the ROSAT bright source catalog (Cat. IX/10) and the WISE all-sky survey (Cat. II/311), revealing 54 additional candidates for TeV observations. Our investigation also led to a tentative classification of 16 unidentified X-ray sources as BL Lac candidates. This analysis provides new interesting BL Lac targets for future observations with ground-based Cherenkov telescopes.2013ApJS..207...16Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/207/16CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012)VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/A+A/555/A2 : J-band variability of AGN (Nesci+, 2013)J/ApJS/206/17 : New gamma-ray blazar candidates in the 3PBC (Maselli+, 2013)J/ApJS/206/12 : Blazars with {gamma}-ray counterparts. I. (D'Abrusco+, 2013)J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/ApJ/741/30 : Radio/{gamma}-ray correlation in AGN (Ackermann+, 2011)J/ApJ/732/116 : IR spectra of {gamma}-ray bright blazars (Malmrose+, 2011)J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)J/MNRAS/402/2403 : AT20G (Murphy+, 2010)J/A+A/524/A64 : The 54-month Palermo BAT-survey catalogue (Cusumano+, 2010)J/ApJ/709/1407 : SED of the Fermi blazars (Li+, 2010)J/A+A/495/691 : Multifrequency cat. of blazars, Roma-BZCAT (Massaro+, 2009)J/A+A/436/799 : X- & gamma-ray fluxes of {gamma}-ray-loud blazars (Fan+, 2005)J/A+A/375/739 : Hard X-ray properties of blazars (Donato+, 2001)J/A+A/379/755 : Radio data of X- and gamma-ray loud blazars (Venturi+, 2001)http://tevcat.uchicago.edu/ : TeVCat home page; online Gamma-Ray cataloghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/207/16https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/207/16http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/207/16https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/207/16https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/207/16http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/207/16GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/207/16/table2 (The complete list of TeV-detected BL Lac objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/207/16/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/207/16/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/207/16/table2?GETtext/xml+votable180.050000true3.4835-18.90180560.005555555555555556Cone search capability for table J/ApJS/207/16/table3 (*The complete list of TBCs selected from the ROMA-BZCAT)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/207/16/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/207/16/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/207/16/table3?GETtext/xml+votable180.050000true8.811291715.25116670.005555555555555556Cone search capability for table J/ApJS/207/16/table4 (*TBCs all-sky selected from the ROSAT-WISE all-sky surveys)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/207/16/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/207/16/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/207/16/table4?GETtext/xml+votable180.050000true3.917208355.86241670.0055555555555555566/43 398 615 1040 2295 2414 2549 2783 2879 2983 3023 3431 4964 5423 5483 6018 6088 6436 6647 6780 7038 7518 7548 7872 7896 8071 8374 8915 8945 8972 9196 9612 9711 10248 10318 10389 10572 10605 10800 11212 12231 13673 13705 13743 13820 13927 14457 14751 15135 15917 15969 16223 16447 16665 16796 16806 17574 17627 17843 19756 19789 20604 20611 20624 20861 20984 21704 22167 22912 23011 23134 23222 23835 24027 24387 25061 25132 27722 28352 28492 28517 28736 28890 29017 29519 30518 31663 32174 32261 32345 32596 33214 33370 33378 33880 33910 34209 35076 35333 35919 35963 35981 36058 36158 36278 36296 36342 37568 38481 38797 39132 40205 40353 40568 40890 41206 42736 42869 43321 43380 43596 43597 43603 44118 44247 44340 45038 46258 46444 47014 47130 47375 47479 47960 491352.762881831355591e-19 3.3785437584409506e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/207/16?format=asciiGamma-rayX-rayOpticalInfrareddefaultJ/ApJS/207/16/table2The complete list of TeV-detected BL Lac objectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBZCatROMA-BZCAT identification (JHHMM+DDMM; <[MGL2009] BZB JHHMM+DDMM> in Simbad) (G1)meta.id;meta.maincharTeVCatTeVCat name (1)meta.id.assoccharWISEWISE name (JHHMMSS.ss+DDMMSS.s)meta.id.crosscharz? ROMA-BZCAT redshiftsrc.redshiftfloatnullableu_z[?] Uncertainty flag on z or unknown zmeta.code.error;src.redshiftcharFX[1.05,324]? ROSAT X-ray flux in the 0.1-2.4keV energy range in units of 10^-12^erg/cm^2^/sfW.m**-2phot.flux;em.X-rayfloatnullableFTev[0.002,0.64]? Archival TeV flux as reported on the TeVCatCrabphot.flux.density;em.gamma.hardfloatnullable2FGL[Yes/No ] Fermi detection in the 2FGL?meta.codechar[3.4/4.6][0.22,1.01] WISE [3.4]-[4.6] color indexmagphot.color;em.IR;em.IRfloate_[3.4/4.6][0.03,0.05] [3.4/4.6] uncertaintymagstat.errorfloat[4.6/12][1.23,2.66] WISE [4.6]-[12] color indexmagphot.color;em.IR;em.IRfloate_[4.6/12][0.02,0.27] [4.6/12] uncertaintymagstat.errorfloatFIR[0.33,126.47] WISE IR flux in the 3.4-12um energy range in units of 10^-12^erg/cm^2^/sfW.m**-2phot.flux.density;em.IRfloate_FIR[0.05,2.41] FIR uncertaintyfW.m**-2stat.errorfloatX/IR[0.01,43.57]? X-ray to IR flux ratio ({Phi}_XIR_) (G2)phot.flux;arith.ratiofloatnullableSimbadSimbad column added by the CDSmeta.refchar_RAPositions from WISE names (right ascension part)degpos.eq.ra;meta.main_DEPositions from WISE names (declination part)degpos.eq.dec;meta.mainJ/ApJS/207/16/table3*The complete list of TBCs selected from the ROMA-BZCATSel[SCTM,- ] Other selection(s)? (3)meta.ref;pos.framecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBZCatROMA-BZCAT name (JHHMM+DDMM; <[MGL2009] BZB JHHMM+DDMM> in Simbad) (G1)meta.id;meta.maincharf_BZCat[*] Not detected at TeV energies (1)meta.codecharWISEWISE name (JHHMMSS.ss+DDMMSS.s)meta.id.crosscharz[0.027,0.443]? ROMA-BZCAT redshiftsrc.redshiftfloatnullableu_z[?] Uncertainty flag on z or unknown zmeta.code.error;src.redshiftcharFX[2.69,33.6] ROSAT X-ray flux in the 0.1-2.4keV energy range (2)fW.m**-2phot.flux;em.X-rayfloat2FGLPresence of source in 2FGL (Cat. J/ApJS/199/31)meta.ref.urlintnullableGamma[1.48,2.39]? 2FGL {gamma}-ray photon indexmeta.code;spect.indexfloatnullable[3.4/4.6][0.29,0.86] WISE [3.4]-[4.6] color indexmagphot.color;em.IR;em.IRfloate_[3.4/4.6][0.03,0.04] [3.4/4.6] uncertaintymagstat.errorfloat[4.6/12][1.69,2.29] WISE [4.6]-[12] color indexmagphot.color;em.IR;em.IRfloate_[4.6/12][0.03,0.08] [4.6/12] uncertaintymagstat.errorfloatFIR[0.92,7.59] WISE IR flux in the 3.4-12um energy range in units of 10^-12^erg/cm^2^/sfW.m**-2phot.flux.density;em.IRfloate_FIR[0.04,0.15] FIR uncertaintyfW.m**-2stat.errorfloatX/IR[0.46,24.77] Ratio between FX and FIR (G2)phot.flux;arith.ratiofloatSimbadSimbad column added by the CDSmeta.refchar_RAPositions from WISE names (right ascension part)degpos.eq.ra;meta.main_DEPositions from WISE names (declination part)degpos.eq.dec;meta.mainJ/ApJS/207/16/table4*TBCs all-sky selected from the ROSAT-WISE all-sky surveysz[0.0656,0.12]? Redshiftsrc.redshiftfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXSROSAT name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharWISEWISE name (JHHMMSS.ss+DDMMSS.s)meta.id.crosscharONameOther name from literature and NED (NVSS, 6dF or SUMSS)meta.idchar[3.4/4.6][0.31,0.86] WISE [3.4]-[4.6] color indexmagphot.color;em.IR;em.IRfloate_[3.4/4.6][0.03,0.08] [3.4/4.6] uncertaintymagstat.errorfloat[4.6/12][1.61,2.32] WISE [4.6]-[12] color indexmagphot.color;em.IR;em.IRfloate_[4.6/12][0.02,0.08] [4.6/12] uncertaintymagstat.errorfloatl_[12/22]Limit flag on [12/22]meta.code.errorchar[12/22][0.77,2.65] WISE [12]-[22] color indexmagphot.color;em.IR;em.IRfloate_[12/22][0.02,0.51]? [12/22] uncertaintymagstat.errorfloatnullableRmag[0,17.55]? USNO-B (Cat. I/284) R-band magnitude (within 3.3")magphot.mag;em.opt.RfloatnullableNotesExistence of counterparts and notes (1)meta.notecharu_z[?] Uncertainty flag on z or unknown zmeta.code.error;src.redshiftcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from WISE names (right ascension part)degpos.eq.ra;meta.main_DEPositions from WISE names (declination part)degpos.eq.dec;meta.main