J/other/RAA/18.5ivo://CDS.VizieR/J/other/RAA/18.56doi:10.26093/cds/vizier/dx/bikfgCDSKang S.-J.Wu Q.Zheng Y.-G.Yin Y.Song J.-L.Zou H.Feng J.-C.,Dong A.-J.Wu Z.-Z.Zhang Z.-B.Wu L.-H.2026-02-10T20:07:31Z2019-10-02T09:09:35ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomybl-lacertae-objectsactive-galactic-nucleiThe curvature of the {gamma}-ray spectrum in blazars may reflect the intrinsic distribution of emitting electrons, which will further give some information on the possible acceleration and cooling processes in the emitting region. The {gamma}-ray spectra of Fermi blazars are normally fitted either by a single power-law (PL) or a log-normal (call Logarithmic Parabola, LP) form. The possible reason for this difference is not clear. We statistically explore this issue based on the different observational properties of 1419 Fermi blazars in the 3LAC Clean Sample.We find that the {gamma}-ray flux (100MeV-100GeV) and variability index follow bimodal distributions for PL and LP blazars, where the {gamma}-ray flux and variability index show a positive correlation. However, the distributions of {gamma}-ray luminosity and redshift follow a unimodal distribution. Our results suggest that the bimodal distribution of {gamma}-ray fluxes for LP and PL blazars may not be intrinsic and all blazars may have an intrinsically curved {gamma}-ray spectrum, and the PL spectrum is just caused by the fitting effect due to less photons.2018RAA....18...56Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RAA/18.56CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)J/ApJ/744/177 : VLBA 5GHz observations of Fermi/LAT AGNs (Linford+, 2012)J/ApJ/761/125 : X and gamma spectral indexes of Fermi blazars (Fan+, 2012)J/ApJ/810/L9/ : 1.5Jy MOJAVE AGN sample and 3FGL data (Lister+, 2015)J/other/RAA/16.13 : Sample of Fermi Blazars (Chen+, 2016)J/A+A/588/A141 : The MWA view of Fermi blazars (Giroletti+, 2016)J/A+A/591/A21 : Optical flux behaviour of Fermi blazars (Marchesini+, 2016)J/A+A/602/A86 : Blazar candidates among Fermi/LAT 3FGL cataloghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/RAA/18.56https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/RAA/18.56http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/RAA/18.56https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/RAA/18.56https://vizier.iucaa.in/viz-bin/votable?-source=J/other/RAA/18.56http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/RAA/18.56GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/RAA/18.56/table1 (Description of the Sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/RAA/18.56/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/other/RAA/18.56/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/RAA/18.56/table1?GETtext/xml+votable180.050000true0.3251047-7.77414440.0055555555555555566/14 39 60 100 110 172 180 250 289 376 398 438 441 447 465 514 556 579 615 700 716 720 730 739 808 851 898 911 961 968 988 991 1018 1085 1087 1094 1120 1222 1584 1593 1680 1915 2028 2042 2094 2098 2100 2122 2143 2228 2234 2273 2295 2331 2340 2404 2414 2434 2439 2460 2478 2484 2505 2574 2610 2621 2636 2661 2708 2741 2754 2792 2808 2822 2836 2867 2912 3401 3428 3431 3528 3566 3569 3833 3876 3886 3947 3951 3974 4080 4088 4091 4134 4255 4259 4261 4312 4317 4352 4472 4475 4601 4685 4695 4723 4770 4801 4820 4825 4855 4863 4865-4866 4880 4882 4919 4940 4960 4964 4977 5072 5091 5098 5139 5156 5162 5201 5250 5270 5284 5311 5352-5353 5361 5390 5404 5423 5432 5460 5462 5483 5491 5516 5522 5536 5546 5597 5614 5616 5693 5720 5723 5771-5772 5775 5784 5792 5803 5817 5836 5848 5870 5872 5918 5990 6015 6018 6021 6062 6065 6067 6088 6096 6101 6103-6104 6110 6164 6167 6212 6292 6306 6348 6368 6427 6436 6498 6501 6507 6515 6548 6559 6568 6636 6638 6647 6723 6754 6764 6777 6815 6822 6829 6888 6910 6937 6948 6963 6984 6996 7004 7038 7045 7091 7176 7181 7233 7235 7269 7285 7296 7310 7315 7319 7336 7343 7346 7354 7378 7380 7389 7411 7426 7446 7448 7475 7478 7518 7530 7548 7570 7623 7640-7641 7653 7655 7699 7709 7758 7764 7808 7859 7896 7911 7969 8004 8056-8057 8067 8071 8089 8091 8100 8173 8177 8290 8299 8321 8339 8374 8439-8440 8450 8466 8487 8502 8509 8515 8556 8595 8615 8657 8699 8717 8746 8762 8818 8830 8915 8945 8955 8972 9003 9013 9049 9062 9075 9175 9196 9202 9204 9268 9284 9301 9310 9442 9445 9460 9501 9545 9554 9566 9570 9612 9629 9632-9633 9641 9676 9688 9711 9714 9723 9763 9773 9811 9853 9855 9872 9893 9906 9914 9960 9998 10006 10033 10046 10067 10071 10119 10123 10163 10170 10183 10198 10213 10216 10239 10249-10250 10280 10282 10288 10294 10352 10389-10390 10422 10426 10466 10474 10501 10512 10522 10524 10548 10561 10572 10597 10605 10612 10625 10656 10669 10681 10715 10780 10800-10801 10810 10843 10910 10921 10949 10971 10994 10996 11004 11012 11027 11066 11081 11083 11100 11116 11143 11153 11177 11209 11212 11216 11223 11242 11253 11268 11290 11321 11323 11352 11373-11374 11385 11396 11426 11430 11444 11522-11523 11585 11594 11631 11639-11640 11649 11682 11736 11749 11756 11777 11787 11839 11865 11876 11912 11936 11965 11975 12109 12113 12173 12179 12197 12199 12218 12225 12231 12248 12251 12258 12277 12285 12323 12352 12385-12386 12444 12466 12475 12599 12604 12619 12625 12643 12650 12666 12687 12780 12851 12902 13083 13098 13156 13165 13179 13352-13353 13406 13410 13447 13456 13485 13496 13572 13582 13586 13613 13640 13664 13673 13693 13705 13711 13729 13731 13743 13826 13867 13927 14575 14854 14857 14871 14943 14955 14976 15003 15023 15037 15059 15147 15211 15269 15286 15305 15358 15903 15916-15917 15955 15969 15996 15998 16027 16057 16059 16086 16223 16272-16273 16281 16298 16355 16392 16447 16478 16510 16532 16534 16578 16606 16638 16661 16665 16676 16679 16696 16720 16736 16796 16806 16816 16821 16885 16892 16971 17048 17146 17161 17184 17186 17215 17236 17275 17347 17364 17401 17414 17443 17516 17537 17539 17541 17574 17579 17601-17602 17611 17665 17673 17745 17775 17797 17842-17843 17857 17917 17927 17944 17957 17994 17999 18022 18035 18053 18070 18084 18109 18119 18190 18210 18219 18240 18253 18259 18270 18315 18366 18402 18416 18436 18457 18484 18491 18506 18604 18624 18661 18718 18755 18766 18889 19023 19042 19088 19109 19143 19157 19202 19327 19370 19373 19398 19421 19502 19523 19525 19589 19593 19616 19622 19629 19694 19723-19724 19756 19789 19831 19890 19907 19910 19918 19989 19999 20006 20016 20049 20074 20083 20095 20141 20202 20213 20224 20325 20456 20468 20476 20478 20481 20483 20489 20577 20604 20624 20657 20659 20736 20777 20888 20920 20968 21073 21091 21121 21131 21142 21160 21164 21179 21188 21217 21358 21493 21768 21792-21793 21806 21813 21873 21905 21935 21960-21961 21968 21972 21987 22363-22364 22372 22386 22388 22396 22501 22558 22658 22730 22767 22823 22828 22844 22894 22917 23011 23014-23015 23022 23099 23105 23121 23127 23134 23181 23215 23222 23263 23335 23383 23402 23416 23436 23542 23691 23718 23901 23932 24027 24084 24112 24123 24580 24608 24626 24635 24655 24744 24775 24785 24801 24818-24820 24828 24845 24853 24861 24885 24902 24906 24908 24910 24941 24980 25061 25132 25184 25196 25239 25302 25387 25389 25501 25503 25539 25542 25611 25630 25647 25649 25673 25677 25734 25760 25818 25820 25835 25857 25864 25910 26016 26032 26036 26073-26074 26083 26131 26167 26178 26203 26242 26254 26256 26276 26292 26303 26308 26322 26340 26361 26363 26406 26442 26470 26483 26513 26539 26548 26550 26565 26595-26596 26614 26626 26677 26695 26798 26833 26850 26873 26898 26964 26983 27056 27060 27082 27138 27165 27217 27248 27310-27311 27329 27394 27423 27433 27442 27472 27509 27523-27524 27603 27605 27646 27710 27716 27797 27846 27852 27857 27945 28042 28066 28083 28101 28117 28138-28139 28199 28222 28225 28268 28318 28342 28350 28352 28370 28388 28401 28416 28454 28479 28492 28498 28517 28542 28546 28606 28662 28947 29016-29018 29247 29336 29570 29580 29620 29675 29729 29772 29828 29952 30012 30015 30036 30039 30134 30195-30196 30842 30928 31079 31190 31239 31362 31391 31407 31430 31451 31461 31485 31566 31599 31656 31663-31664 31666 31681 31698 31773 31844 31894 31915 31930 31967 31986 32034 32174 32185 32247 32261-32262 32311 32345 32370 32433 32596 32605 32611 32621 32712 32738 32808 32818 32831-32832 32904 32913 33008 33040 33043 33137 33158 33164 33198 33203 33214 33237-33238 33348 33356 33370 33378 33382 33412 33467 33501 33506 33528 33549 33560 33570 33575 33583 33611 33670 33679 33684 33744 33746 33774 33818-33819 33825 33880-33881 33898 33929 33968 34013 34038 34085-34086 34099 34123 34128 34163 34168 34209 34245 34264 34317 34428 34437 34461 34517 34520 34528 34534 34569 34572 34637 34656 34675 34699 34747 34767 34771 34779 34870 34900 34911 34931 34956 34966 35063 35074 35076 35079 35116 35119 35146 35187 35199 35252 35274 35281 35312 35330 35333 35342 35370 35402 35434 35441 35475 35498 35501 35535 35590 35700 35706 35722 35765 35786 35790 35801 35821 35833 35925 35963 35981 36001 36033 36038 36058 36090 36100 36111 36113 36117 36134 36144 36151 36155 36188 36251 36278 36296 36301 36333 36342 36361 36370 36551 36554 36602 36607 36614-36615 36665 36708 36719 36770 36882 36941 36973 36997 37040 37045 37261 37385 37487 37512 37519 37529 37534 37564 37568 37667 37761 38186 38189 38266 38277 38316 38332 38355 38369 38481 38483 38635 38663 38715 38759 38766 38772 38797 38802 38868 38911 38918 38937 38953 39065 39077 39092 39131 39134 39142 39146 39210 39466-39467 39477 39489 39505 39517 39544 39576 39671 39848 40047 40174 40194 40205 40214 40265 40323 40344 40353 40392 40412 40434 40527 40533 40689 40692 40703 40762 40766 40811 40831 40842 40874 40890 40905 40919 40949 41030 41047 41058 41072-41073 41088 41110 41130 41325 41335 41345 41363 41988 42081 42256 42261 42901 42904 42914 42980 43246 43366 43377 43380 43382 43399 43412 43441 43447 43451 43556 43572 43595-43597 43603 43643 43651 43788 43793 43805 43822 43877 43883 43888 43993 44011 44043 44050 44052 44059 44069 44106 44147 44153 44170 44192 44247 44255 44291 44308 44313 44340 44365 44526 44539 44582 44592 44638 44661 44669 44705 44730 44791 44799 44813 44908 45011 45038 45081 45122 45146 45178 45196 45214 45284 45293 45310 45315 45330 45358 45386 45406 45482 45491 45713 45773-45774 45820 45836 45914 45943 45957 45972 46041 46055 46142 46200 46204 46251 46258 46285 46304 46310 46331 46337 46342 46359 46369-46370 46373-46374 46392 46404 46442 46444-46445 46448 46483 46501 46511 46545 46547 46564 46613 46721 46740 46772 46787 46798 46835 46852 46872 46887 46921 46963-46964 47014 47016 47021 47046 47057 47067 47080 47101 47132 47152 47154 47231 47248 47277 47319 47327 47375 47398 47413 47466 47479 47497 47512 47534 47540 47605 47649 47675 47708 47714 47720 47894 47960-47961 47969 48023 48123 48154 48201 48245 48259 48306 48388 48398 48419 48589 48595 48603 48624 48629 48685 48798 48829 48885 48985 48995 49037 49043 49068 49071 49083 49141-49142https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/RAA/18.56?format=asciiGamma-raydefaultJ/other/RAA/18.56/table1Description of the Samplez? Redshiftsrc.redshiftdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordint3FGL3FGL name (3FGL JHHMM.m+DDMMa)meta.id;meta.maincharOClassOptical Classification (BL Lac, FSRQ, or BCUs)meta.code.classcharSpType{gamma}-ray spectral shape (PowerLaw or LogParabola)src.classcharSg{gamma}-ray energy flux, from 100MeV to 100GeV obtained by spectral fitting) from the 3FGL (in erg/cm^2^/s)mW.m**-2phot.flux.density;em.gamma.harddoubleVIVariability indexsrc.var.indexdoublelogLg? {gamma}-ray luminosity (in erg/s)1e-07Wphys.luminosity;em.gammadoublenullablelogSglog of {gamma}-ray energy fluxlog(mW.m**-2)phot.flux.density;em.gamma.harddoublelogVIlog of variability indexsrc.var.indexdoubleSimbadSimbad 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