J/ApJS/217/4ivo://CDS.VizieR/J/ApJS/217/4doi:10.26093/cds/vizier.22170004CDSSchinzel F.K.Petrov L.Taylor G.B.Mahony E.K.Edwards P.G.,Kovalev YU.Y.2018-05-29T07:36:43Z2015-04-30T07:44:53ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyradio-continuum-emissionactive-galactic-nucleisupernova-remnantsWe present the results of an all-sky radio survey between 5 and 9GHz of sky areas surrounding all unassociated {gamma}-ray objects listed in the Fermi Large Area Telescope Second Source Catalog (2FGL). The goal of these observations is to find all new {gamma}-ray active galactic nucleus (AGN) associations with radio sources >10mJy at 8GHz. We observed with the Very Large Array and the Australia Telescope Compact Array the areas around unassociated sources, providing localizations of weak radio point sources found in 2FGL fields at arcmin scales. Then we followed-up a subset of those with the Very Long Baseline and the Long Baseline Arrays to confirm detections of radio emission on parsec-scales. We quantified association probabilities based on known statistics of source counts and assuming a uniform distribution of background sources. In total we found 865 radio sources at arcsec scales as candidates for association and detected 95 of 170 selected for follow-up observations at milliarcsecond resolution. Based on this we obtained firm associations for 76 previously unknown {gamma}-ray AGNs. Comparison of these new AGN associations with the predictions from using the Wide-field Infrared Survey Explorer color-color diagram shows that half of the associations are missed. We found that 129 out of 588 observed {gamma}-ray sources at arcmin scales not a single radio continuum source was detected above our sensitivity limit within the 3{sigma} {gamma}-ray localization. These "empty" fields were found to be particularly concentrated at low Galactic latitudes. The nature of these Galactic {gamma}-ray emitters is not yet determined.2015ApJS..217....4Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/217/4CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/328 : AllWISE Data Release (Cutri+ 2013)VII/253 : A Catalogue of Galactic Supernova Remnants (Green, 2009)VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)VIII/82 : 2nd Epoch Molonglo Galactic Plane Survey (MGPS-2) (Murphy+, 2007)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/ApJS/217/2 : Refined associations of Fermi/LAT sources (Massaro+, 2015)J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)J/ApJS/209/34 : The first Fermi-LAT >10GeV catalog (1FHL) (Ackermann+, 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/ApJS/206/13 : Blazars with {gamma}-ray counterparts. II. (Massaro+, 2013)J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)J/MNRAS/419/1097 : The EVN Galactic Plane Survey - EGaPS (Petrov, 2012)J/ApJ/744/177 : VLBA 5GHz observations of Fermi/LAT AGNs (Linford+, 2012)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/AJ/142/105 : Optically Bright Extragalactic Radio Sources (Petrov+, 2011)J/AJ/142/89 : Precise astrometry with VLBA (VIPS) (Petrov+, 2011)J/AJ/142/35 : The VLBA Galactic Plane Survey (VGaPS) (Petrov+, 2011)J/MNRAS/414/2528 : LBA Calibrator Survey (LCS1) (Petrov+, 2011)J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)J/ApJ/707/L56 : VLBI and bright Fermi/LAT sources (Kovalev, 2009)J/ApJS/183/46 : Fermi/LAT bright gamma-ray source list (0FGL) (Abdo+, 2009)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/ApJS/174/481 : 2LC Compact Radio Sources in the GC (Lazio+, 2008)J/ApJ/671/1355 : EGRET blazars in VIPS (Taylor+, 2007)J/AJ/133/1236 : Fifth VLBA calibrator survey: VCS5 (Kovalev+, 2007)J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006)J/AJ/129/1993 : ATNF Pulsar Catalog (Manchester+, 2005)J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005)J/AJ/129/348 : Radio compact HII regions in the Milky Way (Giveon+, 2005)J/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003)J/A+A/397/213 : Galactic HII regions (Paladini+, 2003)J/ApJS/141/13 : VLBA calibrator survey: VCS1 catalog (Beasley+, 2002)J/A+AS/131/11 : Radio sources related to gamma-ray emission (Reich+ 1998)J/A+AS/126/413 : 21cm radio continuum survey. II. (Reich+ 1997)J/A+AS/85/805 : 11cm radio continuum survey. IV. (Fuerst+ 1990)http://astrogeo.org/rfc/ : Radio Fundamental Catalog home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/217/4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/217/4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/217/4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/217/4https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/217/4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/217/4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/217/4/table5 (Possible counterparts from previous radio source catalogs, the ALLWISE catalog, and the Supercosmos database for radio sources found in category I (table2), II (table3), and III (table4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/4/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/4/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/4/table5?GETtext/xml+votable180.050000trueCone search capability for table J/ApJS/217/4/table7 (The 95 VLBI detected radio sources in the fields of 90 2FGL unassociated {gamma}-ray objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/4/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/4/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/4/table7?GETtext/xml+votable180.050000true7.8321238897.4148772220.005555555555555556Cone search capability for table J/ApJS/217/4/table6 (The 117 2FGL fields for which no radio point source was detected within the 4{sigma} localization error at both 5.0/5.5 and 7.3/9.0GHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/4/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/4/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/4/table6?GETtext/xml+votable180.050000true8.17917-55.356110.005555555555555556Cone search capability for table J/ApJS/217/4/table2 (The 148 objects that were detected at 5.0/5.5 and/or 7.3/9.0GHz within 2.7' of the 137 2FGL counterpart localization)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/4/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/4/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/4/table2?GETtext/xml+votable180.050000true0.72362.32139720.005555555555555556Cone search capability for table J/ApJS/217/4/table3 (The 501 objects that were detected at 5.0/5.5 and/or 7.3/9.0GHz between 2.7' and 6.5' of the 324 2FGL counterpart localization)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/4/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/4/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/4/table3?GETtext/xml+votable180.050000true1.648958368.38893330.005555555555555556Cone search capability for table J/ApJS/217/4/table4 (The 216 objects that were detected outside of the 6.5 arcmin and were within the 99% position uncertainty of the 118 2FGL counterpart localization)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/4/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/4/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/4/table4?GETtext/xml+votable180.050000true0.25262563.53041390.0055555555555555565/7579 9482 6/166 172 189 267 289 428 720 731 813 1054 1231 1264 1354 1390 1470 1538 1609 1791 1964 2006 2099 2754 2755 2860 3054 3061 3066 3099 3130 3154 3196 3198 3213 3234 3278 3288 3306 3336 3338 3340 3342 3465 3479 3605 3642 3649 3650 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44011 44241 44253 44284 44302 44540 44585 44654 44777 45011 45122 45191 45199 45284 45316 45397 45446 45496 45586 45587 45618 45736 45740 45741 45914 45970 46035 46041 46057 46158 46285 46337 46361 46534 46568 46569 46613 46720 46723 47154 47190 47442 47461 47612 47742 47894 47939 48019 48025 48227 48528 48573 48575 48685 48743 48784 48797 48799 48840 48842 48845 48868 489576.62606957030801e-25 5.963462613277209e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/217/4?format=asciiGamma-rayRadiodefaultJ/ApJS/217/4/table5Possible counterparts from previous radio source catalogs, the ALLWISE catalog, and the Supercosmos database for radio sources found in category I (table2), II (table3), and III (table4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIAU name of the radio source (JHHMM+DDMM)meta.id;meta.maincharNrNumber of associations for this radio source in tables 2--5meta.ref.urlintnullableF1? Flux density of matching source at 1GHz (1)mJyphot.flux.density;em.radio.750-1500MHzfloatnullableID1ID of matching object in 1GHz catalog (JHHMMSS+DDMMSS) (1)meta.id.assoccharC1Matching 1GHz catalog label (2)meta.codecharWISEID of a matching object in WISE catalog (JHHMMSS.ss+DDMMSS.s)meta.id.assoccharDopt[0/3.5]? Distance between optical & radio localizationarcsecpos;arith.difffloatnullableRAJ2000? Hour of Right Ascension (J2000) (3)pos.eq.ra;meta.mainnullableDEJ2000? Degree of Declination (J2000) (3)pos.eq.dec;meta.mainnullableBmag[10/23]? Optical B magnitudemagphot.mag;em.opt.BfloatnullableRmag[13/21.5]? Optical R magnitudemagphot.mag;em.opt.RfloatnullableCopt[1/2]? Optical classification (1=extended or 2=stellar or point like object)meta.code.classintnullableJ/ApJS/217/4/table7The 95 VLBI detected radio sources in the fields of 90 2FGL unassociated {gamma}-ray objectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIAU name of the radio source (JHHMM+DDMM)meta.id;meta.mainchar2FGL2FGL name of {gamma}-ray source (JHHMM.m+DDMM)meta.id.assoccharNmeta.ref.urlintnullableRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainS[0.005/0.4] VLBI flux densityJyphot.fluxfloatSep[0.2/9.7] Distance between {gamma}-ray and radio positionsarcsecpos;arith.difffloatNd[0/3.4] Distance between {gamma}-ray and radio source; normalized by its uncertaintypos.distancefloatLambda[0.3/16462] Likelihood ratio {Lambda}stat.likelihoodfloatJ/ApJS/217/4/table6The 117 2FGL fields for which no radio point source was detected within the 4{sigma} localization error at both 5.0/5.5 and 7.3/9.0GHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2FGL2FGL name of {gamma}-ray source (JHHMM.m+DDMMc)meta.id;meta.maincharNmeta.ref.urlintnullableRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latdoublerms5[0.009/12] The 5GHz image rms noise; mJy/beamphot.flux.density;em.radio.3-6GHzfloatrms7[0.01/4.2] The 7/9GHz image rms noise; in mJy/beamstat.stdev;instr.det.noisefloatfrFlag on radio source (G1)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJS/217/4/table8The 167 possible associations of 112 2FGL unassociated sources from literaturerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2FGL2FGL name of {gamma}-ray source (JHHMM.m+DDMMc)meta.id;meta.maincharNmeta.ref.urlintnullableAssocName of associated sourcemeta.idcharTypeSource type (1)src.classcharu_Type[?] '?' if not confirmedmeta.notecharBibCodeADS bibcode referencemeta.bib.bibcodecharJ/ApJS/217/4/table2The 148 objects that were detected at 5.0/5.5 and/or 7.3/9.0GHz within 2.7' of the 137 2FGL counterpart localizationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIAU name of the radio source (JHHMM+DDMM)meta.id;meta.maincharNrNumber of associations for this radio source in tables 2--5meta.ref.urlintnullable2FGL2FGL name of {gamma}-ray source (JHHMM.m+DDMMc)meta.id.assoccharNmeta.ref.urlintnullablefrFlag on radio source (G1)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.maine_RAJ2000[0/57] Uncertainty in RAs; without cos{delta} factorarcsecstat.error;pos.eq.rafloatDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_DEJ2000[0.01/59] Uncertainty in DEsarcsecstat.error;pos.eq.decfloatF5? Flux density at 5GHzmJyphot.flux.density;em.radio.3-6GHzfloatnullablee_F5? Uncertainty in F5mJystat.errorfloatnullableF7? Flux density at 7GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullablee_F7? Uncertainty in F7mJystat.errorfloatnullableF9[1/9196]? Flux density at 9GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullablee_F9[0.1/6.2]? Uncertainty in F9mJystat.errorfloatnullableSp5? Spectral index between 4.58 and 6.42GHzspect.indexfloatnullablee_Sp5? Error in Sp5stat.errorfloatnullableSp9[-5.8/7.4]? Spectral index between 4.58 and 6.42GHzspect.indexfloatnullablee_Sp9[0.01/4.1]? Error in Sp9stat.errorfloatnullableSp? Spectral index between 5 and 9/7GHzspect.indexfloatnullablee_Sp? Uncertainty in Spstat.error;src.spTypefloatnullableSep[0/6.5] Distance between {gamma}-ray and radio sourcearcminpos.angDistancefloatNd[0/3] Distance between {gamma}-ray and radio source; normalized by its uncertaintypos.distancefloatCampCampaign (V1:VLA, A1/A2: ATCA)meta.id;instr.obstycharP13Number of times the 2FGL source is cited in Petrov+, 2013, J/MNRAS/432/1294meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJS/217/4/table3The 501 objects that were detected at 5.0/5.5 and/or 7.3/9.0GHz between 2.7' and 6.5' of the 324 2FGL counterpart localizatione_Sp5? Error in Sp5stat.errorfloatnullableNameIAU name of the radio source (JHHMM+DDMM)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNrNumber of associations for this radio source in tables 2--5meta.ref.urlintnullable2FGL2FGL name of {gamma}-ray source (JHHMM.m+DDMMc)meta.id.assoccharNmeta.ref.urlintnullablefrFlag on radio source (G1)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.maine_RAJ2000[0/57] Uncertainty in RAs; without cos{delta} factorarcsecstat.error;pos.eq.rafloatDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_DEJ2000[0.01/59] Uncertainty in DEsarcsecstat.error;pos.eq.decfloatF5? Flux density at 5GHzmJyphot.flux.density;em.radio.3-6GHzfloatnullablee_F5? Uncertainty in F5mJystat.errorfloatnullableF7? Flux density at 7GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullablee_F7? Uncertainty in F7mJystat.errorfloatnullableF9[1/9196]? Flux density at 9GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullablee_F9[0.1/6.2]? Uncertainty in F9mJystat.errorfloatnullableSp5? Spectral index between 4.58 and 6.42GHzspect.indexfloatnullableSp9[-5.8/7.4]? Spectral index between 4.58 and 6.42GHzspect.indexfloatnullablee_Sp9[0.01/4.1]? Error in Sp9stat.errorfloatnullableSp? Spectral index between 5 and 9/7GHzspect.indexfloatnullablee_Sp? Uncertainty in Spstat.error;src.spTypefloatnullableSep[0/6.5] Distance between {gamma}-ray and radio sourcearcminpos.angDistancefloatNd[0/3] Distance between {gamma}-ray and radio source; normalized by its uncertaintypos.distancefloatCampCampaign (V1:VLA, A1/A2: ATCA)meta.id;instr.obstycharP13Number of times the 2FGL source is cited in Petrov+, 2013, J/MNRAS/432/1294meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJS/217/4/table4The 216 objects that were detected outside of the 6.5 arcmin and were within the 99% position uncertainty of the 118 2FGL counterpart localizationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIAU name of the radio source (JHHMM+DDMM)meta.id;meta.maincharNrNumber of associations for this radio source in tables 2--5meta.ref.urlintnullable2FGL2FGL name of {gamma}-ray source (JHHMM.m+DDMMc)meta.id.assoccharNmeta.ref.urlintnullablefrFlag on radio source (G1)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.maine_RAJ2000[0.01/57] Uncertainty in RAs; without cos{delta} factorarcsecstat.error;pos.eq.rafloatDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_DEJ2000[0.01/16.1] Uncertainty in DEsarcsecstat.error;pos.eq.decfloatF5? Flux density at 5GHzmJyphot.flux.density;em.radio.3-6GHzfloatnullableF7? Flux density at 7GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullableF9[0.7/1589.1]? Flux density at 9GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullableSep[6.5/19.4] Distance between {gamma}-ray and radio sourcearcminpos.angDistancefloatNd[0/3] Distance between {gamma}-ray and radio source; normalized by its uncertaintypos.distancefloatCampCampaign (V1:VLA, A1/A2: ATCA)meta.id;instr.obstycharP13Number of times the 2FGL source is cited in Petrov+, 2013, J/MNRAS/432/1294meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar