J/ApJ/752/61ivo://CDS.VizieR/J/ApJ/752/61doi:10.26093/cds/vizier.17520061CDSMassaro F.D'Abrusco R.Tosti G.Ajello M.Paggi A.Gasparrini D.2017-11-29T11:48:59Z2014-03-03T09:08:54ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyinfrared-photometryquasarsbl-lacertae-objectsOne of the main scientific objectives of the ongoing Fermi mission is unveiling the nature of unidentified {gamma}-ray sources (UGSs). Despite the major improvements of Fermi in the localization of {gamma}-ray sources with respect to the past {gamma}-ray missions, about one-third of the Fermi-detected objects are still not associated with low-energy counterparts. Recently, using the Wide-field Infrared Survey Explorer survey, we discovered that blazars, the rarest class of active galactic nuclei and the largest population of {gamma}-ray sources, can be recognized and separated from other extragalactic sources on the basis of their infrared (IR) colors. Based on this result, we designed an association method for the {gamma}-ray sources to recognize if there is a blazar candidate within the positional uncertainty region of a generic {gamma}-ray source. With this new IR diagnostic tool, we searched for {gamma}-ray blazar candidates associated with the UGS sample of the second Fermi {gamma}-ray LAT catalog (2FGL). We found that our method associates at least one {gamma}-ray blazar candidate as a counterpart to each of 156 out of 313 UGSs analyzed. These new low-energy candidates have the same IR properties as the blazars associated with {gamma}-ray sources in the 2FGL catalog.2012ApJ...752...61Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/752/61CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)J/ApJS/209/10 : UGSs. V. kernel approach (Massaro+, 2013)J/ApJS/209/9 : Unidentified gamma-ray sources. IV. X-ray (Paggi+, 2013)J/ApJS/207/4 : Unidentified {gamma}-ray sources. III. Radio (Massaro+, 2013)J/ApJS/206/17 : New gamma-ray blazar candidates in the 3PBC (Maselli+, 2013)J/ApJS/206/13 : Blazars with {gamma}-ray counterparts. II. (Massaro+, 2013)J/ApJS/206/12 : Blazars with {gamma}-ray counterparts. I. (D'Abrusco+, 2013)J/other/RAA/13.259 : gamma-ray Doppler factor for Fermi blazars (Fan+, 2013)J/ApJ/748/68 : WISE IR colors of gamma-ray blazars (D'Abrusco+, 2012)J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)J/A+A/541/A160 : X & gamma-ray observations of selected blazars (Giommi+, 2012)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/ApJ/732/116 : IR spectra of {gamma}-ray bright blazars (Malmrose+, 2011)J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010)J/ApJ/709/1407 : SED of the Fermi blazars (Li+, 2010)J/ApJ/700/597 : FERMI LAT detected blazars (Abdo+, 2009)J/A+A/495/691 : Multifrequency cat. of blazars, Roma-BZCAT (Massaro+, 2009)J/ApJ/626/95 : Gamma-ray blazar candidates (Sowards-Emmerd+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/752/61https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/752/61http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/752/61https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/752/61https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/752/61http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/752/61GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/752/61/table2 (Unidentified gamma-ray sources (UGS) associations for 156 2FGL)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/752/61/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/752/61/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/752/61/table2?GETtext/xml+votable180.050000true9.577916763.10144440.0055555555555555566/166 428 720 813 1354 1609 2006 3061 3099 3154 3207 3288 3340 3342 3465 3700 4088 4784 6292 7131 7936 8091 9175 9417 9645 9647 9821 9855 10063 10074 10096 12991 14338 14356 14904 14906 16087 16258 20481 20606 20735 21656 21710 21898 22208 22243 22249 22683 23105 23227 23365 23982 24340 24343 24566 28681 28716 28781 28804 28805 28823 28828 28854 28862 28892 28954 29118 29154 29252 29613 29758 29782 29783 29803 29816 29881 30218 30262 30330 30352 30353 30420 30588 30671 30697 30781 30836 30957 30999 31021 31032 31092 31093 31116 31199 31262 31289 31720 31788 31823 31837 31856 31860 32035 32050 32087 32093 32288 33027 33028 33030 34106 34107 34128 34375 34569 34592 36144 36716 36892 36910 36957 37128 37222 37923 37929 39733 39777 39779 39889 40585 40636 41110 41298 41543 41653 41837 41891 41897 42107 42140 42190 42199 42205 42220 42369 42371 42451 42454 42511 42561 42565 42579 43003 43021 43024 43038 43060 43075 43109 43156 43319 43531 43660 43805 43862 43877 43996 43998 45446 45618 45738 45741 45936 46057 47155 48019 48685 48743 48799 48868https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/752/61?format=asciiGamma-rayInfrareddefaultJ/ApJ/752/61/table2Unidentified gamma-ray sources (UGS) associations for 156 2FGLrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2FGLUnidentified {gamma}-ray source (UGS) identifier (JHHMM.m+DDMM)meta.id.assoccharWISEThe {gamma}-ray blazar candidate identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharSep[13/2081] Distance of WISE candidate from UGSarcsecpos.angDistancefloatc1-2[0.4/1.4] WISE (3.4-4.6) micron band color indexmagphot.color;em.IR;em.IRfloate_c1-2The 1{sigma} error in c1-2magstat.errorfloatc2-3[1.7/3.5] WISE (4.6-12) micron band color indexmagphot.color;em.IR;em.IRfloate_c2-3The 1{sigma} error in c2-3magstat.errorfloatc3-4[1.2/3] WISE (12-22) micron band color indexmagphot.color;em.IR;em.IRfloate_c3-4The 1{sigma} error in c3-4magstat.errorfloatsbThe s_b_ parameter (1)stat.fit.paramfloatsqThe s_q_ parameter (1)stat.fit.paramfloatCl[A-C] WISE source classification (2)src.classcharpiAssociation confidence {pi} (3)stat.fit.goodnesscharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.refchar_RAIR positions from WISE names (right ascension part)degpos.eq.ra;meta.main_DEIR positions from WISE names (declination part)degpos.eq.dec;meta.main