J/ApJS/282/35ivo://CDS.VizieR/J/ApJS/282/35CDSAgarwal S.Paliya V.S.2026-08-26T14:03:08Z2026-08-26T15:02:51ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleibl-lacertae-objectsgamma-ray-astronomyredshiftedVery high-energy (VHE; >100GeV) {gamma}-ray emission originates via some of the most extreme particle acceleration processes in the Universe. Considering beamed active galactic nuclei, i.e., blazars, only a small fraction, mainly high-synchrotron-peaked BL Lacertae (BLLac) objects, have been detected in the VHE band with ground-based Cherenkov telescopes. We utilized ~16yr of Fermi Large Area Telescope (LAT) observations in the 0.1-2 TeV energy range to systematically search for potential VHE emitters in a sample of high-synchrotron-peaked ({nu}_syn_^peak^>10^15^Hz) BL Lac sources. We identified, for the first time, 92 VHE-emitting blazars at a >=5{sigma} confidence level. A significant VHE emission was also detected from 52 sources previously reported as VHE blazars. Comparing with the general blazar population, these VHE-emitting blazars are found to be located at low redshifts (mean z=0.2+/-0.1) and exhibit bright synchrotron emission (logF_syn_^peak^=-11.2+/-0.4, in erg/cm2/s). We also investigated the coincidence of VHE photon arrivals with the source activity states and found that Fermi-LAT has detected VHE photons during both quiescent and elevated activity epochs. These VHE-emitting blazars represent promising targets for current and next-generation ground-based Cherenkov telescopes, and provide powerful laboratories for probing particle acceleration in relativistic jets, testing multimessenger connections, and constraining extragalactic background light models.2026ApJS..282...35Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/282/35CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/67 : Incremental Fermi LAT 4th source cat. (4FGL-DR3) (Fermi-LAT col., 2022)IX/72 : Fermi LAT Fourth Source Cat. DR4 (4FGL-DR4) (Ballet+, 2023)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/A+A/541/A160 : Planck + X/{gamma} observations of blazars (Giommi+, 2012)J/ApJ/764/135 : Spectroscopic redshifts of BL Lac objects (Shaw+, 2013)J/A+A/579/A34 : 1WHSP: VHE {gamma}-ray blazar candidates (Arsioli+, 2015)J/A+A/598/A134 : gamma-ray signature in WHSP blazars (1BIGB) (Arsioli+, 2017)J/A+A/598/A17 : The 2WHSP catalog (Chang+, 2017)J/A+A/632/A77 : 3HSP blazars catalog (Chang+, 2019)J/ApJS/248/29 : Simultaneous X-ray & gamma obs. of Mrk421 (Acciari+, 2020)J/ApJS/253/46 : Optical spectroscopy of Fermi blazars (Paliya+, 2021)J/ApJS/263/24 : The 4LAC-DR3 catalog (Ajello+, 2022)J/ApJS/261/2 : BASS. XXII. Swift/BAT AGN Sp. Survey DR2 cat. (Koss+, 2022)J/MNRAS/539/1458 : 1st Cosmic Gamma-Ray Horizon Catalog, 1CGH (Arsioli+, 2025)http://www.tevcat.org/ : Online TeVCat cataloghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/282/35https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/282/35http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/282/35https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/282/35https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/282/35http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/282/35GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/282/35/vhe (The spectral parameters of the newly identified (Table 1) and known (Table 2) VHE-emitting blazars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/282/35/vhe?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/282/35/vhe?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/282/35/vhe?GETtext/xml+votable180.050000true3.686758.02720.005555555555555556Cone search capability for table J/ApJS/282/35/table3 (Sources with test statistics (TS) between 12 and 25)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/282/35/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/282/35/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/282/35/table3?GETtext/xml+votable180.050000true3.4804-18.91180.005555555555555556Cone search capability for table J/ApJS/282/35/table4 (The remaining HSP Blazars with TS<12 and at least one VHE photon detected with more than 95% probability of association)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/282/35/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/282/35/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/282/35/table4?GETtext/xml+votable180.050000true4.615129.77920.005555555555555556Cone search capability for table J/ApJS/282/35/table5 (Unassociated Fermi sources where at least one VHE photon was detected)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/282/35/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/282/35/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/282/35/table5?GETtext/xml+votable180.050000true14.495563.43850.0055555555555555566/29 100 115 342 398 423 447 615 716-717 851 988 1203 1462 1551 1617 1853 1915 2028 2094 2100 2273 2295 2549 2621 2647 2650 2708 2879 2896 2966 2989 3004 3023 3338 3351 3382 3416 3431 3492 3569 3616 3629 3667 3710 3721 3974 3984 4050 4255 4312 4317 4472 4475 4798 4964 5072 5091 5270 5279 5423 5432 5483 5523 5657 5723 5918 5990 6001 6015 6018 6021 6067 6088 6436 6647 6723 6754 6910 6988 7038 7176 7233 7301 7310 7518 7548 7553 7569 7640-7641 7699 7777 8008 8067 8071 8134 8143 8258 8290 8374 8595 8603 8945 8980 9003 9013 9049 9060 9196 9542 9612 9711 9762 9892 9984 9991 10071 10119 10605 10656 10680 10766 10800 10810 10912 10980 11449 11523 11639 11682 11715 11749 11756 11778 11865 11876 11912 12079 12179 12197 12231 12351 12410 12433 12643 12851 12902 12973 13035 13098 13179 13204 13457 13492 13586 13613 13640 13673 13705 13743 13820 13867 13986 14166 14320 14395 14477 14578 14751 14814 14871 14943 14981 15059 15228 15269 15358 15410 15495 15917 15969 15993 16223 16273 16447 16638 16665 16696 16786 16796 16806 17161 17494 17537 17574 17721 17775 17797 17994 18096 18270 18498 18506 18666 19042 19756 19907 20016 20141 20325 20456 20481 20489 20611 20624 20680 20696 20777 20861 20984 21010 21073 21179 21203 21704 21732 21806 21898 21961 22140 22239 23011 23085 23134 23222 23284 23400 23516 23756 23825 23835 23901 23932 24004 24023 24027 24037 24243 24260 24387 24512 24580 24626 24655 24737 24785 24923 25061 25132 25510 25525 25734 25760 25910 26242 26322 26446 26626 26677 26798 26964 26986 27021 27063 27257 27442 27603 27716 27722 27846 28092 28115 28138-28139 28225 28352 28388 28432 28498 28517 28546 28736 28971 29018 29126 29247 29300 29315 30015 30035-30036 30039 30195 30498 30518 30565 30570 30573 31011 31239 31362 31519 31663 31679 31763 32050 32244 32261-32262 32344-32345 32537 32596 32621 32990 33039 33059 33140 33164-33165 33198 33214 33350 33467 33528 33583 33606 33611 33670 33880 33898 34163 34209 34285 34304 34437 34528 34900 35074 35076 35146 35199 35333 35441 35630 35664 35821 35927 35963 35981 36005 36058 36134 36278 36296 36342 36779 36882 36951 36973 37441 37492 37494 37523 37568 38112 38192 38331 38797 38861 39092 39208 39210 39466-39467 39671 39969 40174 40205 40323 40351 40353 40452 40689 40890 40919 41067 41363 41510 41574 41966 42779 42914 42920 43350 43380 43382 43596-43597 43603 43746 44011 44153 44290 44336 44340 44539 44592 45011 45038 45068 45242 45293 45316 45632 45820 45836 46090 46239 46258 46442 46444 46564 46622 46918 46924 47014 47065 47101 47130 47154 47319 47375 47398 47479 47497 47960 48245 48504 48603 48624 48778 48829 49142https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/282/35?format=asciiGamma-raydefaultJ/ApJS/282/35/vheThe spectral parameters of the newly identified (Table 1) and known (Table 2) VHE-emitting blazarsz[0.03/0.6]? Spectroscopic redshift of the source (1)src.redshiftdoublenullablee_Fobs[1.4e-07/1.1e-05] Fobs uncertaintystat.error;phot.flux.density;em.gamma.harddoublee_GamObs[0/4.2] GamObs uncertaintystat.error;spect.index;em.gamma.hardfloatGamEBL[0/10]? EBL-attenuation-corrected photon index, in the energy range of 0.1-2TeV (2)spect.index;em.gamma.harddoublenullablee_GamEBL[0.01/4.3]? GamEBL uncertaintystat.error;spect.index;em.gamma.harddoublenullableNvhe[2/375] Number of >100GeV photons detected from the source having >=95% association probabilitymeta.numberint_DEPositions from 4FGL-DR4 (IX/72) (declination part)degpos.eq.dec;meta.main4FGL4FGL source name (JHHMM.m+DDMM)meta.id;meta.maincharNewNewly identified VHE-emitting blazar (Table 1) or known VHE-emitting blazar in TeVCAT (Table 2)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.numbercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTSobs[25/6308] Observed TSstat.likelihood;obsintFobs[2.2e-07/0.0002] Observed energy flux in 10^-6^MeV/cm2/sphot.flux.density;em.gamma.harddoubleGamObs[1.5/10] Observed photon index, in the energy range of 0.1-2TeVspect.index;em.gamma.hardfloatTSebl[25/6309]? EBL-attenuation-corrected TS (2)stat.likelihoodintnullableFebl[0/0.0002]? EBL-attenuation-corrected energy flux in 10^-6^MeV/cm2/s (2)phot.flux.density;em.gamma.harddoublenullablee_Febl[0/1.1e-05]? Febl uncertaintystat.error;phot.flux.density;em.gamma.harddoublenullableEmax[114.3/1726.5] Energy of the maximum energy photonsGeVphys.energy;stat.max;em.gamma.hardfloatMJD[54696.5/60584.6] Time of arrival of the maximum energy photonsdtime.epochfloat_RAPositions from 4FGL-DR4 (IX/72) (right ascension part)degpos.eq.ra;meta.mainJ/ApJS/282/35/table3Sources with test statistics (TS) between 12 and 25recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint4FGL4FGL source name (JHHMM.m+DDMM)meta.id;meta.maincharTSobs[12/24] Observed TSstat.likelihood;obsintFobs[1.3e-07/2.71e-06] Observed energy flux in 10^-6^MeV/cm2/sphot.flux.density;em.gamma.harddouble_DEPositions from 4FGL-DR4 (IX/72) (declination part)degpos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.numberchare_Fobs[9e-08/2.1e-06] Fobs uncertaintystat.error;phot.flux.density;em.gamma.harddoubleGamObs[0.8/10] Observed photon index, in the energy range of 0.1-2TeVspect.index;em.gamma.hardfloate_GamObs[0/4.9] GamObs uncertaintystat.error;spect.index;em.gamma.hardfloatf_GamObs[0/1] Flag on GamObs (1=sources with GamObs=10)meta.codefloatNvhe[1/5] Number of >100GeV photons detected from the source having >=95% association probabilitymeta.numberintEmax[100.1/712.7] Energy of the maximum energy photonsGeVphys.energy;stat.max;em.gamma.hardfloatMJD[54699/60552.1] Time of arrival of the maximum energy photonsdtime.epochfloat_RAPositions from 4FGL-DR4 (IX/72) (right ascension part)degpos.eq.ra;meta.mainJ/ApJS/282/35/table4The remaining HSP Blazars with TS<12 and at least one VHE photon detected with more than 95% probability of associationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNvhe[1/2] Number of >100GeV photons detected from the source having >=95% association probabilitymeta.numberintEmax[100.3/756.6] Energy of the maximum energy photonsGeVphys.energy;stat.max;em.gamma.hardfloatSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.numbercharMJD[54682.8/60583.9] Time of arrival of the maximum energy photonsdtime.epochfloat_RAPositions from 4FGL-DR4 (IX/72) (right ascension part)degpos.eq.ra;meta.main_DEPositions from 4FGL-DR4 (IX/72) (declination part)degpos.eq.dec;meta.main4FGL4FGL source name (JHHMM.m+DDMM)meta.id;meta.maincharJ/ApJS/282/35/table5Unassociated Fermi sources where at least one VHE photon was detectedSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.numbercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNvhe[1/2] Number of >100GeV photons detected from the source having >=95% association probabilitymeta.numberintEmax[100.3/756.6] Energy of the maximum energy photonsGeVphys.energy;stat.max;em.gamma.hardfloatMJD[54682.8/60583.9] Time of arrival of the maximum energy photonsdtime.epochfloat_RAPositions from 4FGL-DR4 (IX/72) (right ascension part)degpos.eq.ra;meta.main_DEPositions from 4FGL-DR4 (IX/72) (declination part)degpos.eq.dec;meta.main4FGL4FGL source name (JHHMM.m+DDMM)meta.id;meta.mainchar