J/MNRAS/462/3180ivo://CDS.VizieR/J/MNRAS/462/3180doi:10.26093/cds/vizier.74623180CDSChiaro G.Salvetti D.La Mura G.Giroletti M.Thompson D.J.,Bastieri D.2024-08-16T20:18:34Z2018-05-15T08:14:47ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyquasarsbl-lacertae-objectsThe Fermi-Large Area Telescope (LAT) is currently the most important facility for investigating the GeV {gamma}-ray sky. With Fermi-LAT, more than three thousand {gamma}-ray sources have been discovered so far. 1144 (~40 per cent) of the sources are active galaxies of the blazar class, and 573 (~20 per cent) are listed as blazar candidate of uncertain type (BCU), or sources without a conclusive classification. We use the empirical cumulative distribution functions and the artificial neural networks for a fast method of screening and classification for BCUs based on data collected at {gamma}-ray energies only, when rigorous multiwavelength analysis is not available. Based on our method, we classify 342 BCUs as BL Lacs and 154 as flat-spectrum radio quasars, while 77 objects remain uncertain. Moreover, radio analysis and direct observations in ground-based optical observatories are used as counterparts to the statistical classifications to validate the method. This approach is of interest because of the increasing number of unclassified sources in Fermi catalogues and because blazars and in particular their subclass high synchrotron peak objects are the main targets of atmospheric Cherenkov telescopes.2016MNRAS.462.3180Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/462/3180CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/462/3180https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/462/3180http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/462/3180https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/462/3180https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/462/3180http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/462/3180GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/462/3180/table3 (Classification list of 3FGL BCUs (Blazar of Unknown Type))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/462/3180/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/462/3180/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/462/3180/table3?GETtext/xml+votable180.050000true0.4822603-41.98182390.0055555555555555566/14 39 289 441 465 556 720 730 739 898 961 968 1087 1094 1116 1203 1222 1233 1315 1342 1390 1462 1584 1680 1741 2042 2100 2331 2434 2439 2478 2708 2754 2896 2912 2929 2966 2983 3052 3135 3241 3272 3338 3382 3401 3465 3528 3566 3616 3650 3654 3667 3675 3700 3710 3774 3781 3833 3841 3947 4080 4088 4091 4723 5250 5616 5720 5772 5803 6062 6065 6306 6638 6754 6829 6910 6937 6988 7378 7518 7758 7859 7964 8004 8056 8089 8091 8173 8502 8717 9268 10033 10067 10239 10282 10390 10522 11066 11083 11156 11216 11426 11652 11865 11961 12104 12109 12113 12179 12197 12225 12248 12251 12277 12285 12385 12444 12643 12650 12780 12851 12902 13083 13165 13230 13273 13278 13447 13456 13826 14166 14395 14477 14575 14608 14646 14745 14871 14943 14976 15003 15024 15358 15410 15783 15903 15941 16086 16273 16355 16392 16480 16578 16679 16696 16821 16885 16892 17206 17275 17539 17601 17673 17797 17957 18053 18190 18240 18366 18484 19421 19502 19525 19589 19867 20074 20095 20481 20659 20693 20736 20935 20968 20984 21073 21091 21142 21164 21217 21321 21403 21626 21704 21711 21758 21792 21806 21813 21987 22066 22239 22386 22441 22767 22844 22894 23263 23335 23402 23513 23542 23718 23720 23825 23857 23882 23901 23932 23966 24004 24161 24311 24319 24326 24387 24416 24432 24444 24580 24626 24635 24655 24801 24818-24820 24853 24861 24885 24908 24910 24980 25184 25387 25539 25611 25647 25649 25760 25820 25857 26167 26169 26363 26470 26513 26548 26677 26833 26850 26900 27248 27394 27423 27603 27605 27646 27710 27852 28416 28736 28789 28904 28947 28969 29018 29126 29247 29300 29336 29580 29828 29876 30134 30195 30284 30518 30573 30590 30667 30842 31071 31239 31461 31599 31681 31986 32035 32050 32185 32262 32370 32433 32596 32773 32818 32913 33008 33043 33137 33158 33203 33214 33238 33348 33378 33382 33419 33467 33501 33746 33818 33898 33929 34085 34163 34168 34245 34264 34569 34656 34779 34871 34900 34911 34931 34956 34966 35079 35116 35146 35263 35274 35330 35402 35434 35498 35535 35765 35925 36001 36038 36251 36296 36361 36370 36607 36614-36615 36973 36997 37040 37138 37191 37215 37229 37246 37261 37278 37311 37487 37519 37534 37564 37568 37667 37686 37688 37761 37779 38046 38186 38246 38266 38316 38332 38369 38418 38470 38483 38579 38635 38797 38832 38911 38937 38942 39062 39065 39092 39134 39142 39146 39210 39341 39354 39395 39464 39467 39477 39517 39544 39576 39671 39742 39752 39963 39969 39974 39978 39998 40047 40092 40096 40194 40205 40214 40323 40392 40470 40474 40533 40635 40842 40890 40905 40919 41009 41030 41047 41058 41073 41088 41130 41325 41345 41464 41507 41524 41543 41619 41725 41729 41751 41903 41938 42081 42107 42118 42188 42202 42256 42261 42493 42571 42779 42834 42904 42978 43038 43066 43085 43112 43116 43186 43198 43228 43377 43412 43441 43556 43572 43597 43603 43643 43651 43793 43805 43877 43888 43993 44011 44050 44052 44137 44153 44192 44255 44291 44308 44365 44526 44539 44582 44638 44791 45011 45068 45122 45146 45214 45284 45293 45310 45315 45330 45358 45386 45406 45482 45491 45697 45773-45774 45820 45836 45914 45957 45972 46041 46200 46280 46285 46304 46342 46359 46370 46392 46445 46483 46501 46511 46564 46613 46772 46963 47021 47046 47067 47101 47132 47152 47154 47231 47277 47398 47466 47497 47630 47675 47720 47912 48154 48201 48259 48398 48407 48829 49043 49068 49142https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/462/3180?format=asciiGamma-raydefaultJ/MNRAS/462/3180/table3Classification list of 3FGL BCUs (Blazar of Unknown Type)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3FGL3FGL name (JHHMM.m+DDMM)meta.id;meta.maincharGLATGalactic latitudedegpos.galactic.latfloatGLONGalactic longitudedegpos.galactic.lonLBBLANN likelihood to be classified as a BL Lacstat.likelihooddoubleLFSRQANN likelihood to be classified as a FSRQ (flat-spectrum radio quasars)stat.likelihoodfloatClassPredicted classification (1)src.classcharHSPcandmost promising HSP candidates (2)meta.codecharSimbadSimbad 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.main