J/ApJ/590/109ivo://CDS.VizieR/J/ApJ/590/109doi:10.26093/cds/vizier.15900109CDSSowards-Emmerd D.Romani R.W.Michelson P.F.2017-09-20T05:13:40Z2006-01-11T06:48:34ZCDS support team

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

cds-question@unistra.frsurveysbl-lacertae-objectsradio-sourcesgamma-ray-astronomyUsing survey data, we have re-evaluated the correlation of flat-spectrum radio sources with EGRET sources in the northern sky. An analysis incorporating the radio and X-ray properties and the gamma-ray source localization is used to gauge the reliability of associations and to search for counterparts of previously unidentified EGRET sources. Above |b|=10{deg}, where the classification is complete, we find that 70% of the northern EGRET sources have counterparts similar to the bright EGRET blazars. For several of these we identify known blazar counterparts more likely than the earlier proposed 3EG association; for ~20 we have new identifications. Spectroscopic confirmation of these candidates is in progress, and we have found flat-spectrum radio quasars and BL Lacertae counterparts with redshifts as high as 4. We also find strong evidence for a set of 28 objects with no plausible counterpart like the known EGRET blazars. These thus represent either a new extragalactic population or a population of Galactic objects with a large scale height. The survey has been extended into the plane, where we find several new blazar candidates; the bulk of the sources are, however, Galactic. Looking ahead to the GLAST era, we predict that several of the present 3EG sources are composite and that higher resolution data will break these into multiple blazar identifications.2003ApJ...590..109Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/590/109CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/590/109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/590/109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/590/109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/590/109https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/590/109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/590/109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/590/109/table1 (Northern 3EG Objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/590/109/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/590/109/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/590/109/table1?GETtext/xml+votable180.050000true2.5673.170.005555555555555556Cone search capability for table J/ApJ/590/109/table2 (New 3EG Counterpart Candidates with Spectroscopic Identification)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/590/109/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/590/109/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/590/109/table2?GETtext/xml+votable180.050000true0.2859291719.242727780.0055555555555555566/332 437 438 515 521 556 579 583 594 909 1128 1143 1262 1312 1362 1487 1509 1562 1985 1988 2414 2750 3145 3308 3356 3649 3819 4695 4822 5423 5816 5847 6069 6640 6646 6647 6822 7004 7255 7576 7592 7896 7947 8514 9442 9460 10064 10201 10213 10250 10337 10340 10524 10527 10548 10551 10910 10932 11075 12241 12283 12441 12467 12473 12475 12671 13352 13687 13768 13927 14424 14608 14609 14622 14641 14690 14693 14702 14707 14888 15309 15310 15567 15646 15761 15763 15968 18037 18208 18209 19398 19420 19882 19883 20097 20110 20122 20224 20228 20472 21974 22252 22255 22517 23014 23022 23310 23364 23406 23410 23416 23427 23433 23436 23502 23518 23547 23588 23952 23960 23995 24081 24185 24260 24269 24283 24302 24362 24452 26292 26314 26342 26345 26614 26620 26983 28083 28092 28433 28479 28493 30319 30388 30594 30716 31190 31665 32131 32589 32637https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/590/109?format=asciiGamma-rayRadiodefaultJ/ApJ/590/109/table1Northern 3EG Objectsz? RedshiftfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3EGThe 3rd EGRET Catalog blazar source namecharprimaryf_3EG[:] J1824+3440 modified into J1824+3441charn_3EGindicates that there is a note in notes.dat filecharu_Names[ibl] Flag on Names (1)charS8.4GHz? The 8.4GHz flux densitymJyintnullableSpIndex? Spectral index (2)floatnullableFoM? Figure of Merit (G1)floatnullableNoteAssociation and/or redshift note (3)charMBlaz[+-] Blazar probability from Mattox et al. (2001, Cat. J/ApJS/135/155) (4)charEBlaz[Aa] Blazar confidence from 3EG (5)charClassClassification (G2)char3EGdatadisplay all 3EG parameters (Cat. J/ApJS/123/79)charSimbadSimbad column added by the CDSchar_RAPosition of the 3EG source (from 3EG catalog) (right ascension part)degpos.eq.ra;meta.main_DEPosition of the 3EG source (from 3EG catalog) (declination part)degpos.eq.dec;meta.mainNamesObject identificationscharJ/ApJ/590/109/notesIndividual notes on 3EG ObjectsNoteText of the notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3EG3EG source designationcharJ/ApJ/590/109/table2New 3EG Counterpart Candidates with Spectroscopic IdentificationFoMFigure of Merit (G1)floatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject identification (JHHMM+DDMM)charRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainR2mag? USNO B1.0 R2 magnitudemagfloatnullableB2mag? USNO B1.0 B2 magnitudemagfloatnullablez? Redshiftfloatnullableu_zUncertainty flag on zcharn_z[*] indicates new redshifts (other archival ones)charClassClassification (G2)char