J/A+A/707/A61ivo://CDS.VizieR/J/A+A/707/A61CDSAkhondi F.Soor M.Hedayati K.2026-04-02T06:28:33Z2026-03-03T09:19:59ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomysurveysSixteen years of continuous observations with the Fermi Large Area Telescope (LAT) provide an unprecedented opportunity to search for faint or previously unrecognized gamma-ray emitters, particularly at high energies where the angular resolution improves and the diffuse background is reduced. We present a new catalog of gamma-ray source candidates identified using a data-driven, clustering-based analysis of Pass 8 LAT data above 3GeV at Galactic latitudes |b|>10{deg}. The pipeline integrates the SIeving MEthod for FInding Core, version 3 (SIMEFIC III) for photon denoising with the density-based spatial clustering of applications with noise (DBSCAN) algorithm. We detect 3112 gamma-ray cluster candidates, of which 2932 are associated with known gamma-ray sources. Cross-matching yields 37 counterparts in 1CGH, 23 in CRATES, 21 in Roma-BZCAT, 17 in MST-12yr. The remaining 370 clusters have no known gamma-ray counterpart and are proposed as new source candidates.2026A&A...707A..61Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A61CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/67 : Incremental Fermi LAT 4th source cat. (4FGL-DR3) (Fermi-LAT col., 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/707/A61https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/707/A61http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/707/A61https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/707/A61https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/707/A61http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/707/A61GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/707/A61/catalog (Main catalog table of gamma-ray source candidates detected using the SIMEFIC III + DBSCAN pipeline)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A61/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A61/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A61/catalog?GETtext/xml+votable180.050000true206.9834444.850610.0055555555555555565/214 11227 6/114 123 262 270 290 341 345 347 583 597 851 860-862 868-869 881 975 1031 1052 1054-1055 1076 1090 1168 1170 1538-1539 2122 2623 2860 3822 3854 3880 3884 3914 3921 4001 4054 4353 4543 4817 4866 5072 5125 5508 5715 5723 5766 5803 5918 6016 6094 6362 6568 7233 7387 7410 7593 7612 7913 8004 8159 8181 8378 8717 9002 9310 9632 9681 9688 9914 10440 10573 10675 10996 11536 11644 11715 12903 14854 15311 15600-15601 15606-15607 15781 15788 15800 15806 15917 15998 16145 16148-16149 16174 16190-16191 16203 16206 16225 16239 16276-16277 16320 16329 16480 16483 16551 16720 16933 17186 17211 17607 17721 18016 18032-18033 18036 18039 18153 18158 18343 18457 18488 18491 18671 18708 18821 18985 19370 19476 19494 19576 19671 19718 19918 20098-20099 20102 20777 21402-21403 21406 21425 21427 21430 21433 21436 21438-21439 21458 21934 22845 22855 22873 22876 23137 23143 23236 23294 23533 23539 23549 23551 24608 24872 24975 24980 25067-25068 25348 25654 25673 25678 25719 25766 25922 26055-26056 26077 26129 26131 26136 26203 26292 26565 26798 26983 27061 27162 27523 27766 28037 28517 29218 29322 30023 30729 31241 31257 31259 31262-31263 31266 31363-31364 31369 31371 31393 31484 31542 31663 32394 32609 32831 33078 33094 33097 33099-33101 33112 33114 33122 33126 33306 33356 33678 34038 34462 34492 34517 34592 34991 35433 35617 35700 36102 36401 36956-36957 37036 38237 39059 41132 41134 41976 42081 42902 42959 42969-42972 42980 42983 42989 42992 42994 43263 43364 43372 43433-43435 43437 43446 43469 43528 43605-43607 43609 43615 43642 43669 43716 43776-43777 43779 43788 43819 43822 43844 43913 43960 43986 44007 44374 44563 44639 44654 44729 44803 44811 44813 44840 44843 44852 44882 44884 44898-44899 44902-44903 44914 44917 44920 44927 44952 45001 45019 45034 45039 45046-45048 45050 45176 45189 45214 45266 45307 45576 46008 46055 46280 46547 46702 46736 46738 46785 46788 46833 47009-47010 47014 47020 47714 47742 47825 47891 47905-47906 48128 48195 48257 48280 48629https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/707/A61?format=asciiGamma-raydefaultJ/A+A/707/A61/catalogMain catalog table of gamma-ray source candidates detected using the SIMEFIC III + DBSCAN pipelinerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameUnique identifier of the gamma-ray source candidate, SIM0N_JHHMM+DDMM (1)meta.id;meta.maincharGLONGalactic longitude of the cluster centerdegpos.galactic.lonGLATGalactic latitude of the cluster centerdegpos.galactic.latdoubleRAJ2000Right ascension (J2000) of the cluster centerdegpos.eq.ra;meta.mainDEJ2000Declination (J2000) of the cluster centerdegpos.eq.dec;meta.mainCatNameName of the external catalog providing the closest associated source, when available (e.g., 4FGL, 1CGH, CRATES, BZCAT, 3HSP)meta.id;meta.tablecharSourceSource designation in the associated external catalogmeta.id.assoccharGLONS? Galactic longitude of the associated catalog sourcedegpos.galactic.lonnullableGLATS? Galactic latitude of the associated catalog sourcedegpos.galactic.latdoublenullableRASdeg? Right ascension (J2000) of the associated catalog sourcedegpos.eq.ranullableDESdeg? Declination (J2000) of the associated catalog sourcedegpos.eq.decnullableAngDist? Angular separation between the cluster center and the associated catalog sourcedegpos.angDistancefloatnullableNNumber of photons assigned to the clustermeta.numberintSStatistical significance of the cluster as derived from the DBSCAN-based analysisstat.fit.goodnessfloatRegionSky region identifier used in the analysis pipelinemeta.idcharSIMstepDenoising iteration step at which the cluster is detectedstat.fit.paramintAvgEnergyMean photon energy of the clusterMeVem.energy;stat.meandoubleAngRadiusAngular radius of the cluster, defined as the characteristic spatial extent of the photon distributiondegphys.angSizedoubleFermiDist? Angular distance between the cluster and the nearest source in the Fermi-LAT 4FGL-DR4 catalogdegmeta.iddoublenullableBridgedDist? Angular distance between components of bridged (merged) clusters, when applicabledegpos.angDistancedoublenullableTypeClassification of the source candidate (e.g., satellite-like, bridged, or catalog-associated)src.classcharFermiSourceName of the associated Fermi-LAT source in the 4FGL-DR4 catalogmeta.id.assocchar