J/ApJ/936/146ivo://CDS.VizieR/J/ApJ/936/146doi:10.26093/cds/vizier.19360146CDSXiao H.Fan J.Ouyang Z.Hu L.Chen G.Fu L.Zhang S.2024-11-13T20:09:54Z2024-08-06T08:34:56ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyvisible-astronomyquasarsbl-lacertae-objectsline-intensitiesredshiftedIt is known that the blazar jet emissions are dominated by nonthermal radiation, while the accretion disk jets are normally dominated by thermal emission. In this work, ourOptical aim is to study the connection between the two types of emission by investigating the correlation between the blazar emission-line intensity property, which embodies the nature of an accretion disk, and the {gamma}-ray flux property, which is the representative of jet emission. We compiled a sample of 656 blazars with available emission-line equivalent widths (EWs), the GeV {gamma}-ray flux, and the spectral energy distribution (SED) information from the literature. In this work, we found 55 previous blazar candidates of uncertain types (BCUs) that are now identified as flat-spectrum radio quasars (FSRQs), and found 52 "changing-look" blazars based on their EWs, 45 of which are newly confirmed. These changing-look blazars have a larger accretion ratio (M/M_Edd_) than BL Lacertae (BL Lac) objects. In addition, we suggest that the lower synchrotron peak blazars (LSPs) could be the source of changing-look blazars because 90.7% of the changing-look blazars in this work are confirmed as LSPs. An anticorrelation between EW and continuum intensity, the so-called global "Baldwin effect" (BEff), has been confirmed. We suggest that the steeper global BEff observed for the blazar than for radio-quiet active galactic nuclei (RQ-AGNs) is caused by the inverse Compton scattering of broad-emission-line photons. This interpretation is further supported by the positive correlation between the emission-line EW and intrinsic inverse Compton luminosity.2022ApJ...936..146Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/936/146CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJ/748/49 : Optical spectroscopy of 1LAC broad-line blazars (Shaw+, 2012)J/other/RAA/13.259 : {gamma}-ray Doppler factor for Fermi blazars (Fan+, 2013)J/other/RAA/14.1135 : Doppler factor for a Fermi blazar sample (Fan+, 2014)J/other/Nat/515.376 : Power of relativistic jets in blazars (Ghisellini+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/804/7 : SaMOSA: optical spectroscopy of 7 Fermi blazars (Isler+, 2015)J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)J/ApJS/234/12 : MOJAVE XV. VLBA 15GHz obs of AGN jets 1996-2016 (Lister+, 2018)J/ApJS/240/6 : LAMOST Quasar Survey: Data Releases 4 and 5 (Yao+, 2019)J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)J/ApJ/892/105 : 4th catalog of Fermi LAT-detected AGNs (4LAC) (Ajello+, 2020)J/ApJS/253/10 : 12yrs of R-band photometry of the quasar 3C 454.3 (Fan+, 2021)J/ApJ/913/146 : The blazar B21420+32 opt & gamma LCs & opt. sp. (Mishra+, 2021)J/ApJS/253/46 : Optical spectroscopy of Fermi blazars (Paliya+, 2021)J/AJ/161/196 : Optical overview of blazars with LAMOST. I (Pena-herazo+, 2021)J/ApJ/925/97 : Fermi-LAT-detected blazars fundamental parameters (Pei+, 2022)J/ApJ/925/40 : Fermi blazar jet properties (Xiao+, 2022)J/ApJS/263/24 : The 4LAC-DR3 catalog (Ajello+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/936/146https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/936/146http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/936/146https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/936/146https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/936/146http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/936/146GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/936/146/table1 (Optical, {gamma}-ray, and SED parameters of 656 4LAC blazars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/936/146/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/936/146/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/936/146/table1?GETtext/xml+votable180.050000true359.692021119.92230670.0055555555555555566/60 110 172 180 376 438 556 579 611 700 808 911 968 991 1018 1085 1509 1546 1767 1782 2140 2143 2234 2331 2404 2568 2574 2636 2661 2741 2750 2836 2844 2867 3024 3128 3402 3712 3820 3882 3886 4260 4267 4352 4407 4572 4750 4805 4820 4863 4880 4918 4940 5009 5125 5139 5154 5162 5201 5212 5268 5284 5306 5352-5353 5371 5390 5404 5448 5453 5458 5460 5516 5546 5553 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 6582 6601 6641 6764 6777 6948 6976 6984 7004 7028 7045 7181 7200 7220 7245 7248 7296 7310 7336 7346 7389 7426 7446 7456 7553 7653 7709 7872 7911 7951 7969 8004 8031 8057 8299 8339 8432 8440 8466 8487 8510 8565 8699 8751 8773 8830 8858 9003 9073 9075 9188 9204 9284 9353 9435 9442 9460 9477 9524 9545 9629 9632-9633 9641 9655 9676 9723 9805 9813 9853 9893 9906 9992 9998 10025 10030 10033 10123 10163 10213 10216 10249-10250 10294 10352 10390 10422 10426-10427 10442 10466 10474 10501 10522 10524 10548 10551 10561 10597 10642 10681 10695 10740 10814 10971 10983 10996 11027 11081 11099 11116 11124 11136 11177 11290 11303 11407 11443 11461 11523 11536 11594 11631 11774 11777 11787 11839 12164 12173 12352 12386 12466 12473 12475 12599 12604 12625 12687 12842 13156 13320 13352-13353 13410 13427 13485 13572 13582 13693 13729 13927 14068 14641 14842 14854 14916 15014 15023 15147 15494 15947 15951 16027 16056 16059 16247 16298 16661 16676 16720 16774 16971 17184 17186 17215 17236 17326 17351 17364 17366 17401 17414 17541 17665 17711 17791 17857 17909 17927 17937 17944 17988 17999 18002 18005 18022 18035 18053 18084 18092 18109 18416 18561 18624 18661 18668 18706 18755 18763 18766 18799 18812 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49071https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/936/146?format=asciiGamma-rayOpticaldefaultJ/ApJ/936/146/table1Optical, {gamma}-ray, and SED parameters of 656 4LAC blazarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint4FGLThe 4FGL identifier (JHHMM.m+DDMM)meta.id;meta.maincharz[0.027/4.314] Spectroscopic redshift (1)src.redshiftfloatEW-Ha[4.72/2376]? H{alpha} equivalent width (1)0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_EW-Ha[1/1376]? Uncertainty in EW-Ha (1)0.1nmstat.error;spect.line.eqWidth;em.line.HalphafloatnullableEW-Hb[0/1045]? H{beta} equivalent width (1)0.1nmspect.line.eqWidth;em.line.Hbetafloatnullablee_EW-Hb[0/145]? Uncertainty in EW-Hb (1)0.1nmstat.error;spect.line.eqWidth;em.line.HbetafloatnullableFlux[6.26e-11/8.69e-08] Integral 1-100GeV photon flux (2)ph.cm**-2.s**-1phot.flux;em.gamma.harddoublealpha[1.95/3.04] Photon index (2)spect.indexfloatClass4LAC DR2 (see Ajello+ 2022, J/ApJS/263/24) classification (3)meta.code.class;src.classcharDR3Display data from 4LAC-DR3 (Ajello+ 2022, J/ApJS/263/24) and 4LAC (Ajello+ 2020, J/ApJS/263/24)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RAPosition from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad (declination part)degpos.eq.dec;meta.mainEW-MgII[0/1154]? Mg II equivalent width (1)0.1nmspect.line.eqWidthfloatnullablee_EW-MgII[0.2/242]? Uncertainty in EW-MgII (1)0.1nmstat.error;spect.line.eqWidthfloatnullableEW-CIV[0/1963]? C IV equivalent width (1)0.1nmspect.line.eqWidthfloatnullablee_EW-CIV[0.06/268]? Uncertainty in EW-CIV (1)0.1nmstat.error;spect.line.eqWidthfloatnullablelogBLR[41.76/46.42] Log broad line region luminosity; erg/slog(1e-07W)phys.luminosityfloatlogIC[-12.63/-9.32]? Log inverse Compton peak flux; erg/cm^2^/slog(mW.m**-2)phot.flux.density;em.gamma.hardfloatnullable