J/ApJ/779/133ivo://CDS.VizieR/J/ApJ/779/133doi:10.26093/cds/vizier.17790133CDSAcero F.Donato D.Ojha R.Stevens J.Edwards P.G.Ferrara E.,Blanchard J.Lovell J.E.J.Thompson D.J.2017-12-15T10:55:29Z2015-06-15T09:17:00ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyx-ray-sourcesradio-continuum-emissionultraviolet-astronomyThe Fermi Gamma-Ray Space Telescope has been detecting a wealth of sources where the multiwavelength counterpart is either inconclusive or missing altogether. We present a combination of factors that can be used to identify multiwavelength counterparts to these Fermi unassociated sources. This approach was used to select and investigate seven bright, high-latitude unassociated sources with radio, UV, X-ray, and {gamma}-ray observations. As a result, four of these sources are candidates to be active galactic nuclei, and one to be a pulsar, while two do not fit easily into these known categories of sources. The latter pair of extraordinary sources might reveal a new category subclass or a new type of {gamma}-ray emitter. These results altogether demonstrate the power of a multiwavelength approach to illuminate the nature of unassociated Fermi sources.2013ApJ...779..133Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/779/133CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/217/4 : 2FGL sources observed between 5-9GHz (Schinzel+, 2015)J/MNRAS/432/1294 : Fermi unassociated sources ATCA observations (Petrov+, 2013)J/ApJS/208/25 : Swift X-ray observations of 1FGL sources (Takeuchi+, 2013)J/ApJS/206/13 : Blazars with {gamma}-ray counterparts. II. (Massaro+, 2013)J/ApJ/756/33 : X-ray sources near 2 {gamma}-ray sources (Cheung+, 2012)J/MNRAS/424/L64 : AGN/pulsar distinction for 2FGL sources (Mirabal+, 2012)J/ApJ/753/83 : Associations to 1FGL sources (Ackermann+, 2012)J/ApJ/752/61 : Blazars in unidentified {gamma}-ray sources (Massaro+, 2012)J/A+A/541/A160 : Planck + X/{gamma} observations of blazars (Giommi+, 2012)J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/A+A/458/245 : 2 Unidentified Gamma-ray Sources obs. (La Palombara+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/779/133https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/779/133http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/779/133https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/779/133https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/779/133http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/779/133GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/779/133/table2 (Multiwavelength fluxes for the 4 sources presented in Fig. 2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/779/133/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/779/133/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/779/133/table2?GETtext/xml+votable180.050000true25.94842-58.763940.005555555555555556Cone search capability for table J/ApJ/779/133/table1 (Multiwavelength properties of the observed sample of seven 2FGL unassociated sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/779/133/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/779/133/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/779/133/table1?GETtext/xml+votable180.050000true25.947492-58.7642640.0055555555555555566/5448 5450 21010 21806 32050 33528 37183 43194https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/779/133?format=asciiGamma-rayX-rayUVRadiodefaultJ/ApJ/779/133/table2Multiwavelength fluxes for the 4 sources presented in Fig. 2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName2FGL identifier (JHHMM)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainlognu[7.8/25.2] Log of the frequency {nu}log(Hz)em.freqfloate_lognu[0/0.8] Error in lognulog(Hz)stat.errorfloatlogF[-15.7/-10.9] Log of the flux; erg/s/cm^2^log(mW.m**-2)phot.flux.densityfloate_logF[0/0.3] Error in logFlog(mW.m**-2)stat.errorfloatJ/ApJ/779/133/table1Multiwavelength properties of the observed sample of seven 2FGL unassociated sourcesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName2FGL identifier (JHHMM) as in table 2meta.id;meta.tablecharP(AGN)[0.5/1]? Probability of the source to be an AGN (1)stat.fit.goodnessfloatnullableXIDX-ray name as in Figure 1 (2)meta.id.crosscharDet[3/43] Detection significance ({sigma}_det_) (2)stat.likelihood;obsfloatVar[3/10]? Significance of X-ray variability (2)stat.fit.goodnessfloatnullablef_VarN: No significant variability was observed ({sigma}_var_<3)meta.codecharUVDetection of an UV counterpart in the 4 Swift/UVOT U, W1, M2 and W2 filters (3)meta.codecharRadioDetection of a radio counterpart at 5.5, 9, 17, 19, 38, and 40GHz with ATCA (3)meta.codecharNfNumber of frequency measurements for this 2FGL sourcemeta.numberintnullableSEDSED plotmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main