J/ApJS/217/2ivo://CDS.VizieR/J/ApJS/217/2doi:10.26093/cds/vizier.22170002CDSMassaro F.D'Abrusco R.Landoni M.Paggi A.Masetti N.Giroletti M.,Oti-Floranes H.Chavushyan V.Jimenez-Bailon E.Patino-Alvarez V.,Digel S.W.Smith H.A.Tosti G.2017-09-19T14:24:17Z2015-04-29T11:56:51ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyastronomical-object-identificationsurveysredshiftedactive-galactic-nucleiThe Fermi-Large Area Telescope (LAT) First Source Catalog (1FGL) was released in 2010 February and the Fermi-LAT 2-Year Source Catalog (2FGL) appeared in 2012 April, based on data from 24 months of operation. Since they were released, many follow up observations of unidentified {gamma}-ray sources have been performed and new procedures for associating {gamma}-ray sources with potential counterparts at other wavelengths have been developed. Here we review and characterize all of the associations as published in the 1FGL and 2FGL catalogs on the basis of multifrequency archival observations. In particular, we located 177 spectra for the low-energy counterparts that were not listed in the previous Fermi catalogs, and in addition we present new spectroscopic observations of eight {gamma}-ray blazar candidates. Based on our investigations, we introduce a new counterpart category of "candidate associations" and propose a refined classification for the candidate low-energy counterparts of the Fermi sources. We compare the 1FGL-assigned counterparts with those listed in 2FGL to determine which unassociated sources became associated in later releases of the Fermi catalogs. We also search for potential counterparts to all of the remaining unassociated Fermi sources. Finally, we prepare a refined and merged list of all of the associations of 1FGL plus 2FGL that includes 2219 unique Fermi objects. This is the most comprehensive and systematic study of all the associations collected for the {gamma}-ray sources available to date. We conclude that 80% of the Fermi sources have at least one known plausible {gamma}-ray emitter within their positional uncertainty regions.2015ApJS..217....2Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/217/2CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/97 : 74MHz VLA Low-frequency Sky Survey Redux (VLSSr) (Lane+, 2014)IX/43 : 1SXPS Swift X-ray telescope point source catalogue (Evans+ 2014)VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)VIII/69 : The WISH catalogue at 352 MHz (de Breuck+ 2002)J/ApJS/213/3 : Low-frequency flat spectrum sources (LORCAT) (Massaro+, 2014)J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)J/AJ/147/143 : MOJAVE. XI. Spectral distributions (Hovatta+, 2014)J/ApJS/209/34 : The first Fermi-LAT >10GeV catalog (1FHL) (Ackermann+, 2013)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/208/25 : Swift X-ray observations of 1FGL sources (Takeuchi+, 2013)J/ApJS/208/17 : 2nd Fermi LAT cat. of gamma-ray pulsars (2PC) (Abdo+, 2013)J/ApJS/207/4 : Unidentified {gamma} sources. III. Radio (Massaro+, 2013)J/AJ/146/10 : Spectro. of emission-line ICRF2 candidates (Titov+, 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/206/12 : Blazars with {gamma}-ray counterparts. I. (D'Abrusco+, 2013)J/ApJ/771/57 : Fermi-LAT flaring gamma sources from FAVA (Ackermann+, 2013)J/ApJ/764/135 : Spectroscopic redshifts of BL Lac objects (Shaw+, 2013)J/MNRAS/428/220 : Gamma-ray AGN type determination (Hassan+, 2013)J/A+A/548/A99 : XMM-Newton Slew Survey in 2-10keV (Warwick+, 2012)J/AJ/144/105 : MOJAVE. VIII. Faraday rotation in AGN jets. (Hovatta+, 2012)J/ApJ/756/33 : X-ray sources near 2 bright {gamma} 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/748/68 : WISE IR colors of gamma-ray blazars (D'Abrusco+, 2012)J/other/NewA/16.503 : 2MASS observation of BL Lac objects II. (Mao+, 2011)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/ApJ/742/66 : New Fermi/LAT extragalactic sources (Teng+, 2011)J/ApJ/742/27 : 15GHz and jet properties of MOJAVE blazars (Lister+, 2011)J/ApJ/741/30 : Radio/{gamma}-ray correlation in AGN (Ackermann+, 2011)J/ApJS/195/8 : The QUaD Galactic Plane Survey. II. (Culverhouse+, 2011)J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)J/ApJ/718/587 : The Fermi-AT20G catalog (Mahony+, 2010)J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)J/ApJ/715/429 : First Fermi-LAT AGN catalog (1LAC) (Abdo+, 2010)J/MNRAS/402/2403 : Australia Telescope 20GHz Survey Catalog (Murphy+, 2010)J/ApJ/707/L56 : VLBI and bright Fermi/LAT sources (Kovalev, 2009)J/ApJ/706/L7 : The Fermi LAT sky as seen by INTEGRAL/IBIS (Ubertini+, 2009)J/A+A/495/691 : Multifrequency blazars catalog, Roma-BZCAT (Massaro+, 2009)J/ApJS/175/97 : CGRaBS: survey of {gamma}-ray blazar cand. (Healey+, 2008)J/ApJ/671/1355 : EGRET blazars in VIPS (Taylor+, 2007)J/A+A/476/759 : X-ray properties of AGN from the CJF sample (Britzen+, 2007)J/ApJS/171/61 : Survey of Flat-Spectrum Radio Sources (Healey+, 2007)J/ApJS/135/155 : Radio identification of 3EG EGRET sources (Mattox+, 2001)J/MNRAS/323/757 : Deep X-Ray Radio Blazar Survey (DXRBS). II. (Landt+, 2001)J/ApJS/129/547 : RBSC-NVSS sample. I. (Bauer+, 2000)J/ApJ/481/95 : Radio identification of EGRET sources (Mattox+ 1997)J/ApJS/107/239 : 327MHz survey of the galactic plane (Taylor+ 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/217/2https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/217/2http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/217/2https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/217/2https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/217/2http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/217/2GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/217/2/table4 (Refined associations of the Fermi catalogs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/2/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/2/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/2/table4?GETtext/xml+votable180.050000true0.20833366.0016670.0055555555555555565/5563 9335 10542 6/14 18 60 100 110 172 189 250 289 372 398 428 438 447 514 556 579 642 716 720 731 770 808 813 851 893 911 916 968 991 1026 1054 1085 1094 1120 1199 1222 1231 1263 1264 1314 1342 1354 1390 1462 1470 1482 1509 1538 1546 1593 1609 1622 1684 1700 1701 1791 1853 1915 1957 1963 1964 1965 1970 2006 2028 2042 2094 2099 2100 2122 2140 2143 2228 2234 2273 2295 2331 2340 2400 2404 2411 2414 2439 2484 2574 2636 2661 2709 2741 2749 2754 2792 2808 2822 2836 2855 2860 2867 2879 2912 3017 3023 3024 3055 3061 3071 3096 3099 3128 3130 3154 3196 3207 3234 3272 3278 3279 3288 3302 3306 3308 3338 3340 3366 3419 3431 3441 3465 3479 3492 3508 3523 3569 3605 3606 3616 3629 3642 3649 3650 3651 3652 3656 3667 3673 3681 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Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibcode if anymeta.bib.bibcodecharAutAuthor's name(s)meta.bib.authorcharCommCommentmeta.notecharJ/ApJS/217/2/table4Refined associations of the Fermi catalogsSimbadNameSimbad column added by the CDSmeta.idchar2FGL2FGL name (JHHMM.m+DDMM)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1FGL1FGL name (JHHMM.m+DDMM)meta.id;meta.mainchar1FHL1FHL name (JHHMM.m+DDMM)meta.idchargclgamma-ray source category (1)meta.codecharC1The first low-energy counterpartmeta.id.assoccharn_C1Multifrequency notes for C1 (2)meta.notecharz[0/3.2]? Redshift estimatesrc.redshiftdoublenullablef_z[ ?/el] Flag for zmeta.codecharinsideSpatial notes on C1 (3)meta.notecharincludeSpatial notes on C1 (4)meta.notecharclassC1Source class for the C1 (5)meta.code.classcharRAC1? Hour of Right Ascension (J2000)pos.eq.ranullableDEC1? Degree of Declination (J2000)pos.eq.decnullableB2magC1[0/23]? USNO-B1 B magnitude for C1 (6)magphot.mag;em.opt.BfloatnullableR2magC1[0/25]? USNO-B1 R magnitude for C1 (6)magphot.mag;em.opt.RfloatnullableC2The second low-energy counterpartmeta.id.assoccharn_C2Multifrequency notes for C2 (2)meta.notecharclassC2Source class for C2 (5)meta.code.classcharRAC2? Hour of Right Ascension (J2000)pos.eq.ranullableDEC2? Degree of Declination (J2000)pos.eq.decnullableB2magC2[0/21.2]? USNO-B1 B magnitude for C2 (6)phot.mag;em.opt.BfloatnullableR2magC2[0/26]? USNO-B1 R magnitude for C2 (6)phot.mag;em.opt.RfloatnullablePbzb? Probability of C1 as BL Lac (BZB) (7)%stat.fit.goodnessfloatnullablePbzq? Probability of C1 as BZQ (8)%stat.fit.goodnessfloatnullableNEDSimbad column added by the CDSmeta.ref.urlchar_RAPositions from 1FGL or 2FGL source in SIMBAD (right ascension part)degpos.eq.ra;meta.main_DEPositions from 1FGL or 2FGL source in SIMBAD (declination part)degpos.eq.dec;meta.main