J/PASP/134/H4102ivo://CDS.VizieR/J/PASP/134/H4102doi:10.26093/cds/vizier.61353102CDSHuang D.Li Z.Liao J.Huang X.Li C.Qian Y.Pei Z.Fan J.2025-09-09T14:15:16Z2023-04-04T14:28:59ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsgamma-ray-astronomyThe location of {gamma}-ray-emitting region in blazars has been an open issue for several decades and is still being debated. We use the Paliya et al. sample of 619 {gamma}-ray-loud flat-spectrum radio quasars with available spectral energy distributions and employ a seed photon factor approach to locate the {gamma}-ray production region. This method efficiently sets up a relation between the peak frequencies and luminosities for the synchrotron emission and inverse Compton scattering, together with a combination of the energy density and characteristic energy for the external seed photon field, namely, sqrt{U_0_}/{epsilon}_0_, an indicative factor of seed photons in units of Gauss. By comparing it with canonical values of the broad-line region (BLR) and molecular dusty torus (DT), we principally ascertain that the GeV emission originated far beyond the BLR and close to the DT-farther out at parsec scales from the central black hole, which supports a far-site scenario for {gamma}-ray blazars. We probe the idea that inverse Compton scattering of infrared seed photons is happening in the Thomson regime. This approach and our findings are based on the validity of the external Compton model, which is applicable in understanding the GeV emission mechanism in FSRQs. However, the completeness of this framework has been challenged by reports of neutrino emission from blazars. Thus, we also shed new light on the neutrino production region by using our derived results because blazars are promising neutrino emitters.2022PASP..134h4102Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/134/H4102CatalogResearchIsServedByTAP 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/PASP/134/H4102https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/134/H4102http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/134/H4102https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/134/H4102https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/134/H4102http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/134/H4102GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/134/H4102/table1 (Fermi FSRQs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/134/H4102/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/134/H4102/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/134/H4102/table1?GETtext/xml+votable180.050000true359.69219.92230560.0055555555555555566/60 110 172 180 376 438 611 700 808 911 968 991 1018 1509 1546 1767 1782 2143 2234 2331 2404 2574 2661 2721 2741 2750 2836 2867 3024 3128 3402 3712 3820 3886 4260 4267 4285 4352 4407 4572 4750 4820 4880 4918 4940 5009 5125 5139 5154 5162 5201 5212 5268 5306 5352-5353 5371 5390 5404 5448 5453 5458 5460 5491 5516 5546 5589 5597 5616 5693 5728 5771 5775 5781 5795 5803 5817 5848 5870 5878 5986 5999 6062 6101 6104 6164 6167 6268 6292 6368 6406 6448 6496 6498 6501 6548 6601 6641 6777 6976 6984 7004 7028 7045 7181 7200 7220 7226 7245 7248 7310 7336 7346 7389 7426 7446 7456 7553 7653 7709 7872 7911 7951 7969 8031 8057 8199 8299 8339 8432 8440 8466 8510 8565 8699 8773 8830 8858 9003 9073 9075 9188 9204 9284 9321 9353 9435 9442 9460 9477 9524 9545 9629 9632-9633 9641 9655 9676 9723 9805 9813 9853 9855 9893 9906 9992 9998 10025 10030 10123 10163 10213 10216 10249-10250 10294 10352 10422 10426-10427 10432 10442 10466 10474 10485 10501 10524 10548 10551 10561 10597 10642 10681 10695 10740 10814 10944 10971 10983 10996 11027 11065 11081 11099 11116 11124 11136 11177 11303-11304 11407 11443 11461 11523 11536 11594 11631 11774 11777 11787 11839 12173 12352 12386 12466 12473 12604 12625 12687 12842 13156 13320-13321 13352 13410 13485 13572 13582 13693 13729 14068 14641 14842 14854 14916 15014 15023 15147 15494 15947 15951 16027 16056 16247 16661 16676 16720 16774 16971 17184 17186 17215 17236 17326 17364 17366 17414 17494 17541 17665 17711 17791 17857 17909 17927 17937 17944 17988 18002 18005 18022 18032 18035 18053 18087 18092 18109 18416 18561 18624 18661 18668 18706 18718 18755 18763 18766 18812 18821 18954 19100 19109 19190 19202 19332 19398 19500 19593 19617 19622 19629 19851 19857 19867 19886 19910 19918 20074 20099 20146 20210 20213 20224 20476 20483 20610 20657 20693 20725 20735 20781 21121 21142 21188 21266 21358 21437 21781 21806 21927 21935 22047 22066 22271 22305 22388 22396 22501 22558 22658 22730 22768 22799 22804 22917 22950 23014 23022 23099 23121 23215 23306 23364 23383 23416 23691 23786 23882 23897 24084 24123 24333 24444 24571 24661 24775 24819 24845 24906 25082 25106 25196 25255 25302 25332 25501 25503 25549 25630 25649 25677 25807 25818 25835 25864 25990 26032 26036 26131 26204 26274 26292 26301 26303 26340 26442 26470 26513 26543 26642 26858 26873 26897-26898 27047 27206 27243 27289 27310 27322 27413 27433 27436 27509 27525 27548 27672 27689 27857 27926 28042 28066 28083 28167 28268 28318 28339 28370 28446 28463 28479 28606 28615 28618 28673 29570 29675 30446 31190 31334 31391 31407 31430 31451 31664 31844 31875 31915 32314 32614 32691 32808 32832 32841 33008 33195 33238 33382 33419 33430 33549 33560 33570 33684 33774 33827 33833 33881 33964 34012-34013 34086 34095 34099 34210 34264 34517 34637 34675 34699 34870-34871 34931 35079 35119 35141 35294 35370 35402 35535 35706 35720 35801 35833 36090 36100 36133 36188 36273 36346 36460 36549 36551 36554 36665 36688 36708 36840 37190 37202 37385 37512 37519 37686 37777 38046 38277 38579 38734 38763 38766 38802 38916 38954 39077 39469 39542 40265 40331 40344 40527 40762 40931 40949 41110 41335 41426 41460 41942 42105 42609 42658 42822 42901 42980 43246 43366 43451 43503 43978 43986 44043 44658 44730 44840 44908 45011 45081 45178 45262 45454 45843 45943 46055 46220 46251 46310 46373 46394 46439 46445 46798 46835 46852 46868 46887 46964-46965 47016 47080 47106 47327 47512 47534 47540 47605 47630 47649 47943 48023 48123 48300 48320 48362 48388 48589 48595 48685 48797-48798 48846 48995 49017 49071https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/134/H4102?format=asciiGamma-raydefaultJ/PASP/134/H4102/table1Fermi FSRQsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint4FGL4FGL name (JHHMM.m+DDMM)meta.id;meta.maincharClassClassification (1)meta.code.classcharzRedshiftsrc.redshiftfloatlognusynPeak frequency of synchrotron emissionlog(Hz)em.freqfloatlognuICPeak frequency of inverse Compton emissionlog(Hz)em.freqfloatlogLsynPeak luminosity of synchrotron componentlog(1e-07W)phys.luminosityfloatlogLICFlux of the peak luminosity of the IC componentlog(1e-07W)phys.luminosityfloatCDCompton dominancephot.flux;arith.ratiofloatRefReference for lognusyn and lognuIC (2)meta.ref;pos.framecharalphagamma-ray photon index adopted from 4FGL-DR3spect.indexfloatlogLggamma-ray luminositylog(1e-07W)phys.luminosity;em.gammafloatSFSeed photon factorGstat.fit.paramfloat_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