J/A+A/458/245ivo://CDS.VizieR/J/A+A/458/245doi:10.26093/cds/vizier.34580245CDSLa Palombara N.Mignani R.P.Hatziminaoglou E.Schirmer M.Bignami G.F.,Caraveo P.2017-06-19T07:57:58Z2006-12-16T22:08:38ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyx-ray-sourcespulsarsThe systematic X-ray and optical coverage of low-latitude unidentified gamma-ray sources, aiming at sources with high X-ray/optical flux ratio, seems one of the most promising ways to spot INS candidate counterparts. We have focussed on two middle-latitude, probably galactic, EGRET sources: 3EG J0616-3310 and 3EG J1249-8330. Here we report on X-ray observations of the two gamma-ray error boxes performed with XMM-Newton and on their optical follow-up carried on with the Wide Field Imager at the ESO/MPG 2.2m telescope. Less than half of the ~300 sources detected by the X-ray coverage have no optical counterparts. Among those, we have selected few interesting sources with f_X_/f_opt_>100, which we consider promising INS candidates.2006A&A...458..245Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/458/245CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos Main Catalogue (ESA, 1997)VII/206 : General Photometry of Galaxies (Prugniel+, 1998)VII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/458/245https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/458/245http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/458/245https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/458/245https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/458/245http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/458/245GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/458/245/table1 (Main characteristics of the 8 EPIC observations of 3EG J0616-3310 (Obs=1-4) & 3EG J1249-8330 (Obs=5-8))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/458/245/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/458/245/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/458/245/table1?GETtext/xml+votable180.050000true94.44625-32.9205280.0055555555555555566/20552-20554 41002-41003 41089https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/458/245?format=asciiGamma-rayX-rayRadiodefaultJ/A+A/458/245/table1Main characteristics of the 8 EPIC observations of 3EG J0616-3310 (Obs=1-4) & 3EG J1249-8330 (Obs=5-8)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsEPIC field sequential reference numbermeta.id;obs.fieldintRevRevolution number of XMMmeta.id;obsintObsDateObservation datetime.epochnullableObsTimeObservation time (hh:mm:ss)time.epochnullableRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainPNExposure time for PN instrumentkstime.duration;obs.exposurefloatMOS1Exposure time for MOS1 instrumentkstime.duration;obs.exposurefloatMOS2Exposure time for MOS2 instrumentkstime.duration;obs.exposurefloatNHHydrogen column density1e+20cm**-2phys.columnDensityfloatDetNumber of detected sourcesmeta.numberintJ/A+A/458/245/table7Main characteristics of the X-ray sources with no candidate optical counterpart and log(FX/Fopt)>~2l_kTbb[<>= ] Limit flag on kTbbmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsEPIC field sequential reference numbermeta.id;obs.fieldintXMMUXMMU designation (JHHMMSS.s+DDMMSS)meta.id;meta.maincharBandsDetection bandsinstr.bandpasscharl_kTbt[<>= ] Limit flag on kTbtmeta.code.errorcharkTbtRange of possible kT temperature for thermal bremsstrahlung spectrumkeVphys.temperaturefloatkTbt2? Range of possible kT temperature for thermal bremsstrahlung spectrumkeVphys.temperatureintnullablekTbbRange of possible kT temperature for thermal blackbody spectrumkeVphys.temperaturefloatkTbb2? Range of possible kT temperature for thermal blackbody spectrumkeVphys.temperaturefloatnullablel_Gamma[<>= ] Limit flag on Gammameta.code.errorcharGammaRange of photon index for a power law spectrumkeVmeta.code;spect.indexfloatGamma2? Range of photon index for a power law spectrumkeVspect.indexfloatnullableFluxSource flux in 0.3-10keV energy range1e-17W.m**-2phot.flux;em.X-rayfloate_Fluxrms uncertainty on Flux1e-17W.m**-2stat.error;phot.fluxfloatlog(FX/Fopt)Lower limit of X-ray-to-optical flux ratiophot.flux;arith.ratiofloate_log(FX/Fopt)rms uncertainty on log(FX/Fopt)stat.errorfloat