J/PASP/135/A4101ivo://CDS.VizieR/J/PASP/135/A4101doi:10.26093/cds/vizier.61354101CDSYe X.-H.Zeng X.-T.Huang D.-Y.Zhang Z.Pei Z.-Y.Fan J.-H.2025-09-09T14:15:18Z2023-05-05T13:38:11ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-galaxiesbl-lacertae-objectsgamma-ray-astronomyredshiftedOur knowledge of Giga-electron volt (GeV) radio galaxies has been revolutionized by the Fermi-LAT Telescope, which provides an excellent opportunity to study the physical properties of GeV radio galaxies. According to the radio power and morphology, radio galaxies can be separated into Fanaroff-Riley Type I radio galaxies (FR-Is) and Type II radio galaxies (FR-IIs). In this paper, we consider the unification of FR-Is and BL Lacertae objects (BL Lacs), and assume FR-Is to be a standard candle to discuss the beaming effect for Fermi-LAT-detected FR-Is. Our main conclusions are as follows: (1) The estimated Doppler factors for 30 Fermi-LAT-detected FR-Is are in a range of {delta}_I_=0.88-7.49. The average Doppler factor (<{delta}_I_>=2.56+/-0.30) of the 30 FR-Is is smaller than that (<{delta}_BL_>=10.28+/-2.03) of the 126 Fermi-LAT-detected BL Lacs, supporting the unification model that FR-Is are regarded as the misaligned BL Lacs with smaller Doppler factors; (2) We propose that different regions of FR-Is in the plot of the {gamma|-ray luminosity against the photon spectral index logL_{gamma}-{alpha}_ph_ may indicate the different beaming effects; (3) The average Doppler factor of the 6 TeV FR-Is is similar to that of the 24 non-TeV FR-Is, which implies that the difference between the TeV and GeV emissions is not driven by the beaming effect in the Fermi-LAT-detected FR-I samples.2023PASP..135a4101Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/135/A4101CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/67 : Incremental Fermi LAT 4th source cat. (4FGL-DR3)J/ApJ/866/137 : Bright blazars variability brightness temp. (Liodakis+, 2018)J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/135/A4101https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/135/A4101http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/135/A4101https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/135/A4101https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/135/A4101http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/135/A4101GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/135/A4101/table1 (The gamma-ray properties and derived results of the 30 Fermi-LAT-detected FR-Is)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/135/A4101/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/135/A4101/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/135/A4101/table1?GETtext/xml+votable180.050000true2.3981611-32.27692330.005555555555555556Cone search capability for table J/PASP/135/A4101/table2 (The gamma-ray properties for the 126 Fermi-LAT-detected BL Lacs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/135/A4101/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/135/A4101/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/135/A4101/table2?GETtext/xml+votable180.050000true1.5992-6.34930.0055555555555555566/18 514 579 988 1222 1680 1700-1701 2140 2220 2636 2844 3017 3710 3882 4695 4770 4866 5156 5284 5423 6014 6018 6067 6088 6096 6532 6636 6647 6948 6951 6963 7131 7548 7570 7597 7758 8004 8258 8487 8515 8615 8915 9104 9566 9612 9684 9711 9811 10033 10157 10910 11212 11216 11242 11279 11396 11430 11522 11639 12241 12475 12599 13353 13731 13820 13927 15286 16059 16272 16281 16298 16480 16532 16539 16971 17161 17351 17401 17516 17579 17602 17779 17917 18037 18119 18253 18853 19023 19088 19271 19373 19723 19743 19878 20006 20888 20920 21160 21960 21968 21972 22363 23015 23323 23436 24260 25734 26363 26547 26550 26983 27060 27524 27714 27765 28117 28139 28225 28249 28352 28415 28454 28492 28517 29017 29772 30928 31423 31599 31663 31666 31894 32311 33611 33825 34038 34123 34461 34493 34572 34767 36941 38355 39658 41701 41988 43262 44147 44669 46204 46911 47057 47375 47636 49037https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/135/A4101?format=asciiGamma-rayRadiodefaultJ/PASP/135/A4101/table1The gamma-ray properties and derived results of the 30 Fermi-LAT-detected FR-IsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint4FGL4FGL name (4FGL JHHMM.m+DDMM)meta.id;meta.maincharNameOther Namemeta.idcharzRedshiftsrc.redshiftfloatalphaPhPhoton spectral indexspect.indexfloatlogFglogarithm of the gamma-ray flux densitylog(mW.m**-2)phot.flux.density;em.gamma.hardfloatlogLObsglogarithm of the observed gamma-ray luminositylog(1e-07W)phys.luminosity;em.gammafloatdeltagDoppler factorspect.dopplerParamfloatB_deltagPossible maximum value of Doppler factorspect.dopplerParamfloatb_deltagPossible minimum value of Doppler factorspect.dopplerParamfloat_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.mainJ/PASP/135/A4101/table2The gamma-ray properties for the 126 Fermi-LAT-detected BL Lacs4FGL4FGL name (4FGL JHHMM.m+DDMM)meta.id;meta.maincharSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzRedshiftsrc.redshiftfloatalphaPhPhoton spectral indexspect.indexfloatlogFglogarithm of the gamma-ray flux densitylog(mW.m**-2)phot.flux.density;em.gamma.hardfloatlogLgObslogarithm of the observed gamma-ray luminositylog(1e-07W)phys.luminosity;em.gammafloatdeltagDoppler factorspect.dopplerParamfloatr_deltagDoppler factor references (1)meta.ref;pos.framecharlogLgInlogarithm of the gamma-ray intrinsic luminositylog(1e-07W)phys.luminosity;em.gammafloat_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