J/ApJ/838/139ivo://CDS.VizieR/J/ApJ/838/139doi:10.26093/cds/vizier.18380139CDSSchinzel F.K.Petrov L.Taylor G.B.Edwards P.G.2018-03-12T08:40:30Z2017-12-08T09:54:19ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyradio-continuum-emissionastronomical-object-identificationThe third Fermi Large Area Telescope {gamma}-ray source catalog (3FGL) contains over 1000 objects for which there is no known counterpart at other wavelengths. The physical origin of the {gamma}-ray emission from those objects is unknown. Such objects are commonly referred to as unassociated and mostly do not exhibit significant {gamma}-ray flux variability. We performed a survey of all unassociated {gamma}-ray sources found in 3FGL using the Australia Telescope Compact Array and Very Large Array in the range 4.0-10.0 GHz. We found 2097 radio candidates for association with {gamma}-ray sources. The follow-up with very long baseline interferometry for a subset of those candidates yielded 142 new associations with active galactic nuclei that are {gamma}-ray sources, provided alternative associations for seven objects, and improved positions for another 144 known associations to the milliarcsecond level of accuracy. In addition, for 245 unassociated {gamma}-ray sources we did not find a single compact radio source above 2 mJy within 3{sigma} of their {gamma}-ray localization. A significant fraction of these empty fields, 39%, are located away from the Galactic plane. We also found 36 extended radio sources that are candidates for association with a corresponding {gamma}-ray object, 19 of which are most likely supernova remnants or H II regions, whereas 17 could be radio galaxies.2017ApJ...838..139Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/838/139CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VIII/78 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2006)VIII/82 : 2nd Epoch Molonglo Galactic Plane Survey (MGPS-2) (Murphy+, 2007)II/328 : AllWISE Data Release (Cutri+ 2013)I/337 : Gaia DR1 (Gaia Collaboration, 2016)J/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)J/A+A/489/849 : Revised catalog of EGRET gamma-ray sources (Casandjian+, 2008)J/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/MNRAS/414/2528 : LBA Calibrator Survey (LCS1) (Petrov+, 2011)J/ApJ/753/83 : Associations to 1FGL sources (Ackermann+, 2012)J/ApJS/208/17 : 2nd Fermi LAT cat. of gamma-ray pulsars (2PC) (Abdo+, 2013)J/AJ/146/5 : Optically Bright extragalactic Radio Sources II (Petrov, 2013)J/MNRAS/432/1294 : Fermi unassociated sources ATCA observations (Petrov+, 2013)J/MNRAS/435/400 : ATLASGAL compact HII regions (Urquhart+, 2013)J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)J/ApJS/217/4 : 2FGL sources observed between 5-9GHz (Schinzel+, 2015)J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (TGSS) (Intema+, 2017)http://astrogeo.org/rfc/ : The Radio Fundamental Catalog (RFC) home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/838/139https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/838/139http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/838/139https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/838/139https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/838/139http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/838/139GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/838/139/table2 (The catalog of 2097 objects detected at 5, 7 or 9GHz subbands)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/139/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/139/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/139/table2?GETtext/xml+votable180.050000true0.0802563.16443330.005555555555555556Cone search capability for table J/ApJ/838/139/table3 (Associations of 3FGL objects with compact radio sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/139/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/139/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/139/table3?GETtext/xml+votable180.050000true0.03505909167-37.639075983330.005555555555555556Cone search capability for table J/ApJ/838/139/table5 (The list of 158 extended sources found around 3FGL unassociated {gamma}-ray objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/139/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/139/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/139/table5?GETtext/xml+votable180.050000true359.923666765.700960.005555555555555556Cone search capability for table J/ApJ/838/139/table6 (The list of 245 3FGL unassociated objects that have no radio source brighter 2mJy within 3-{sigma} localization error ellipse)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/139/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/139/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/139/table6?GETtext/xml+votable180.050000true0.40435.590.005555555555555556Cone search capability for table J/ApJ/838/139/outside (Objects outside the 3-{sigma} Fermi localization error ellipse (datafile_online.txt))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/139/outside?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/139/outside?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/139/outside?GETtext/xml+votable180.050000true0.1686667-37.69164440.0055555555555555565/912 5359 7579 9462 9482 9504 6/50 136 137 166 172 187 189 267 270 289 342 428 543 661 720 731 813 897 997 1160 1231 1250 1252 1253 1264 1285 1287 1298 1344 1354 1538 1539 1731 1762 1791 1847 1853 1957 1959 1962 1973 1976 2006 2008 2359 2400 2402 2530 2539 2667 2678 2704 2722 2748 2754 2755 2785 2844 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48829 48845 48854 48858 48868 48869 48875 48951 48957 48962 48985 49068 491429.939104750406538e-26 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/838/139?format=asciiGamma-rayRadiodefaultJ/ApJ/838/139/table2The catalog of 2097 objects detected at 5, 7 or 9GHz subbandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFmeta.ref.urlintnullableNameIAU name of the radio source (JHHMM+DDMM; FRC)meta.id;meta.maincharCmeta.ref.urlintnullableExmeta.ref.urlintnullableRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_RAJ2000[0.3/8.1] Uncertainty in RAs; without cos(DE) factorarcsecstat.error;pos.eq.rafloate_DEJ2000[0.3/4.1] Uncertainty in DEsarcsecstat.error;pos.eq.decfloatl_F5GHzFlag for flux density at 5GHz (G1)meta.code.errorcharF5GHz[0.7/7385]? Flux density at 5GHzmJyphot.flux.density;em.radio.3-6GHzfloatnullablee_F5GHz[0.1/23]? Uncertainty in flux density at 5GHzmJystat.errorfloatnullablel_F9GHzFlag for flux density at 9GHz (G1)meta.code.errorcharF9GHz[1/5949]? Flux density at 9GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullablee_F9GHz[0.1/4]? Uncertainty in flux density at 9GHzmJystat.errorfloatnullableSpind[-4.6/5]? Spectral index between 5 and 9GHzspect.indexfloatnullablee_Spind[0/2]? Uncertainty in spectral indexstat.errorfloatnullableCIDCampaign ID (see the "Description" section above)meta.id;obschar3FGL3FGL name of the gamma-ray source (JHHMM.m+DDMMa)meta.id.crosscharprimarySep[0.06/15] Distance between gamma-ray and radio sourcearcminpos.angDistancefloatNSep[0.05/3] Distance between gamma-ray and radio source normalized by its uncertaintymeta.notefloatRFCID of the matching object in RFC catalogue (JHHMM+DDMM) (G2)meta.id.crosscharF8GHz[3/1329]? Correlated flux density at 8GHz of matching source from the RFC cataloguemJyphot.flux.density;em.radio.6-12GHzfloatnullableLR[0/41460]? The likelihood ratio of radio-gamma associationstat.likelihood;arith.ratiofloatnullableSUMSSID of the matching object in SUMSS or MGPS-2 catalogue (JHHMMSS+DDMMSS)meta.id.crosscharF0.84GHz[6/1897]? Flux density of matching source from SUMSS or MGPS-2 catalogues at 0.84GHzmJyphot.flux.density;em.radio.750-1500MHzfloatnullableNVSSID of the matching object in NVSS catalogue (HHMMSS+DDMMSS; J2000)meta.id.crosscharF1.4GHz[2/161188]? Flux density of matching source from NVSS catalogue at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzdoublenullableTGSSADRID of the matching source from TGSS catalogue (JHHMMSS.s+DDMMSS)meta.id.crosscharF0.15GHz[21/63865]? Integral flux density of matching source from TGSS catalogue at 0.15GHzmJyphot.flux.density;em.radio.100-200MHzfloatnullableWISEAID of a matching object in WISE catalogue (JHHMMSS.ss+DDMMSS.s)meta.id.crosscharW1mag[-0.3/18.4]? Magnitude of matching source from ALLWISE catalogue at 3.4 micronmagphot.mag;em.IR.3-4umfloatnullableGAIA? ID of a matching object in Gaia DR1 catalogmeta.id.crossnullableGmag[7.3/21.2]? Magnitude of matching source from Gaia catalogue at G filtermagphot.mag;em.opt.VfloatnullableRAO? Hour of Right Ascension of matching Gaia source (J2000)pos.eq.ranullableDEO? Degree of Declination of matching Gaia source (J2000)pos.eq.decnullablePFA[0/0.005]? Probability of false association with Gaiastat.fit.goodnessdoublenullableS15Display data from Schinzel+, 2015, J/ApJS/217/4meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJ/838/139/table3Associations of 3FGL objects with compact radio sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3FGL3FGL name of the gamma-ray source (JHHMM.m+DDMM)meta.id;meta.maincharRFCIAU name of the radio source (JHHMM+DDMM) (G2)meta.id.crosscharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maineRA[0.1/757] Uncertainty in right ascension of the VLBI position without cos(DE) factormasstat.errorfloateDE[0.1/999.99] Uncertainty in declination of the VLBI positionmasstat.errorfloatCor[-1/1] Correlation between right ascension and declination VLBI position estimatesstat.correlationfloatSep[0.06/12.1] Distance between gamma-ray and radio sourcearcminpos.angDistancefloatNSep[0.06/3] Distance between gamma-ray and radio source normalized by its uncertaintymeta.notefloatS8GHz[6/1329] Total VLBI flux density at 8GHzmJyphot.flux.density;em.radio.6-12GHzfloatLR[8/41460] The likelihood ratio of radio-gamma associationstat.likelihood;arith.ratiofloatAssocAssociation reported in the 3FGL source cataloguemeta.id.assoccharJ/ApJ/838/139/table5The list of 158 extended sources found around 3FGL unassociated {gamma}-ray objectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3FGL3FGL name of the gamma-ray source (JHHMM.m+DDMMa)meta.id;meta.maincharRAJ2000? Hour of Right Ascension (J2000)pos.eq.ra;meta.mainnullableDEJ2000? Degree of Declination (J2000)pos.eq.dec;meta.mainnullableSep[0.3/34]? Distance between gamma-ray and radio positionsarcminpos.angDistancefloatnullableNSep[0.1/28]? Distance between gamma-ray and radio source normalized by its uncertaintymeta.notefloatnullableCSource class (1)src.classintSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJ/838/139/table6The list of 245 3FGL unassociated objects that have no radio source brighter 2mJy within 3-{sigma} localization error ellipserecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3FGL3FGL name of the gamma-ray source (JHHMM.m+DDMMa)meta.id;meta.maincharTGSSADRTGSS ADR1 name near the 3FGL position (JHHMMSS.s+DDMMSS)meta.id.crosscharSep[0.8/16]? Distance between gamma-ray and radio positionsarcminpos.angDistancefloatnullableNSep[13/177]? Distance between gamma-ray and radio source normalized by its uncertaintymeta.notefloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED 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.mainJ/ApJ/838/139/outsideObjects outside the 3-{sigma} Fermi localization error ellipse (datafile_online.txt)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIAU name of the radio source (JHHMM+DDMM; FRC)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_RAJ2000[0.3/8] Uncertainty in RAs; without cos(DE) factorarcsecstat.error;pos.eq.rafloate_DEJ2000[0.3/6] Uncertainty in DEsarcsecstat.error;pos.eq.decfloatl_F5GHzFlag for flux density at 5GHz (G1)meta.code.errorcharF5GHz[0.8/6276]? Flux density at 5GHzmJyphot.flux.density;em.radio.3-6GHzfloatnullablee_F5GHz[0.1/100]? Uncertainty in flux density at 5GHzmJystat.errorfloatnullablel_F9GHzFlag for flux density at 9GHz (G1)meta.code.errorcharF9GHz[1/9035]? Flux density at 9GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullablee_F9GHz[0.1/74]? Uncertainty in flux density at 9GHzmJystat.errorfloatnullableSpind[-3.5/5]? Spectral index between 5 and 9GHzspect.indexfloatnullablee_Spind[0/1]? Uncertainty in spectral indexstat.errorfloatnullableCIDCampaign ID (see the "Description" section above)meta.id;obscharS15Display data from Schinzel+, 2015, J/ApJS/217/4meta.ref.urlintnullable