J/ApJ/789/135ivo://CDS.VizieR/J/ApJ/789/135doi:10.26093/cds/vizier.17890135CDSWilliamson K.E.Jorstad S.G.Marscher A.P.Larionov V.M.Smith P.S.,Agudo I.Arkharov A.A.Blinov D.A.Casadio C.Efimova N.V.Gomez J.L.,Hagen-Thorn V.A.Joshi M.Konstantinova T.S.Kopatskaya E.N.,Larionova E.G.Larionova L.V.Malmrose M.P.McHardy I.M.Molina S.N.,Morozova D.A.Schmidt G.D.Taylor B.W.Troitsky I.S.2017-09-19T14:24:12Z2017-03-17T15:38:58ZCDS support team

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

cds-question@unistra.frspectrophotometryx-ray-sourcesgamma-ray-astronomyultraviolet-astronomyinfrared-photometryvisible-astronomyWide-band photometrybl-lacertae-objectsquasarsWe present {gamma}-ray, X-ray, ultraviolet, optical, and near-infrared light curves of 33 {gamma}-ray bright blazars over 4 years that we have been monitoring since 2008 August with multiple optical, ground-based telescopes and the Swift satellite, and augmented by data from the Fermi Gamma-ray Space Telescope and other publicly available data from Swift. The sample consists of 21 flat-spectrum radio quasars (FSRQs) and 12 BL Lac objects (BL Lacs). We identify quiescent and active states of the sources based on their {gamma}-ray behavior. We derive {gamma}-ray, X-ray, and optical spectral indices, {alpha}_{gamma}_, {alpha}_X_, and {alpha}_o_, respectively (F_{nu}_{prop.to}{nu}^{alpha}^), and construct spectral energy distributions during quiescent and active states. We analyze the relationships between different spectral indices, blazar classes, and activity states. We find (1) significantly steeper {gamma}-ray spectra of FSRQs than for BL Lacs during quiescent states, but a flattening of the spectra for FSRQs during active states while the BL Lacs show no significant change; (2) a small difference of {alpha}_X_ within each class between states, with BL Lac X-ray spectra significantly steeper than in FSRQs; (3) a highly peaked distribution of X-ray spectral slopes of FSRQs at ~ -0.60, but a very broad distribution of {alpha}_X_of BL Lacs during active states; (4) flattening of the optical spectra of FSRQs during quiescent states, but no statistically significant change of {alpha}_o_ of BL Lacs between states; and (5) a positive correlation between optical and {gamma}-ray spectral slopes of BL Lacs, with similar values of the slopes. We discuss the findings with respect to the relative prominence of different components of high-energy and optical emission as the flux state changes.2014ApJ...789..135Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/789/135CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/157 : An Ultraviolet Atlas of Quasar and Blazar SpectraJ/A+AS/114/337 : CCD photometric observations of blazars (Jia Guibin+, 1995)J/A+A/436/799 : X- and gamma-ray fluxes of {gamma}-ray-loud blazarsJ/ApJS/175/97 : CGRaBS: survey of {gamma}-ray blazar candidatesJ/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010)J/ApJ/732/116 : IR spectra of {gamma}-ray bright blazars (Malmrose+, 2011)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/ApJ/761/125 : X and {gamma} spectral indexes of Fermi blazars (Fan+, 2012)J/MNRAS/439/690 : Optical/{gamma}-ray variability in blazars (Hovatta+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/789/135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/789/135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/789/135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/789/135https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/789/135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/789/135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/789/135/table1 (Sources Analyzed)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/789/135/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/789/135/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/789/135/table1?GETtext/xml+votable180.050000true35.665041743.03550.0055555555555555566/579 2414 4695 4770 4820 5423 7570 7896 7969 9442 9460 9633 10422 13927 18661 19398 20099 21972 23099 23121 24084 25302 25864 26131 26292 27060 28083 28479 28492 29570 31894 42901 449082.4622242610829604e-19 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/789/135?format=asciiX-rayGamma-rayUVInfraredOpticaldefaultJ/ApJ/789/135/table1Sources AnalyzedzRedshift (2)src.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintNameObject identifiermeta.id;meta.maincharprimaryANameCommonly used namemeta.idchar2FGLCatalog Object's name as listed in the 2FGL catalog (1)meta.idcharn_z[d?] Note on z (3)meta.notecharRAJ2000Hour of Right Ascension (J2000) (4)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (4)pos.eq.dec;meta.mainClassObject's optical classification (1)meta.code.classcharSEDclassSED classification (1)meta.code.classcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/789/135/table4Weighted Mean Flux and Weighted Standard DeviationsFJ? Mean J band fluxmJyphot.flux.density;em.IR.JfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject identifiermeta.id;meta.maincharprimaryFgammaMean Fermi {Gamma}-ray flux; photons/s/cm^2^count.cm**-2.s**-1phot.flux.density;em.gamma.harddoublee_FgammaWeighted standard deviation of Fgammacount.cm**-2.s**-1stat.errordoubleo_FgammaNumber of observations used for Fgammameta.numberintFX? Mean Swift/XRT X-ray flux; erg/s/cm^2^mW.m**-2phot.flux;em.X-raydoublenullablee_FX? Weighted standard deviation of FXmW.m**-2stat.errordoublenullableo_FXNumber of observations used for FXmeta.numberintFuvw2? Mean Swift/UVOT w2 band fluxmJyphot.flux;em.UVfloatnullablee_Fuvw2? Weighted standard deviation of Fuvw2mJystat.errorfloatnullableo_Fuvw2Number of observations used for Fuvw2meta.numberintFuvm2? Mean Swift/UVOT m2 band fluxmJyphot.flux;em.UVfloatnullablee_Fuvm2? Weighted standard deviation of Fuvm2mJystat.errorfloatnullableo_Fuvm2Number of observations used for Fuvm2meta.numberintFuvw1? Mean Swift/UVOT w1 band fluxmJyphot.flux;em.UVfloatnullablee_Fuvw1? Weighted standard deviation of Fuvw1mJystat.errorfloatnullableo_Fuvw1Number of observations used for Fuvw1meta.numberintFU? Mean Johnson U band fluxmJyphot.flux.density;em.opt.Ufloatnullablee_FU? Weighted standard deviation of FUmJystat.errorfloatnullableo_FUNumber of observations used for FUmeta.numberintFBMean Johnson B band fluxmJyphot.flux.density;em.opt.Bfloate_FBWeighted standard deviation of FBmJystat.errorfloato_FBNumber of observations used for FBmeta.numberintFV? Mean Johnson V band fluxmJyphot.flux.density;em.opt.Vfloatnullablee_FV? Weighted standard deviation of FVmJystat.errorfloatnullableo_FVNumber of observations used for FVmeta.numberintFRMean Johnson R band fluxmJyphot.flux.density;em.opt.Rfloate_FRWeighted standard deviation of FRmJystat.errorfloato_FRNumber of observations used for FRmeta.numberintFI? Mean I band fluxmJyphot.flux.density;em.opt.Ifloatnullablee_FI? Weighted standard deviation of FImJystat.errorfloatnullableo_FINumber of observations used for FImeta.numberinte_FJ? Weighted standard deviation of FJmJystat.errorfloatnullableo_FJ? Number of observations used for FJmeta.numberintnullableFH? Mean H band fluxmJyphot.flux.density;em.IR.H;stat.meanfloatnullablee_FH? Weighted standard deviation of FHmJystat.errorfloatnullableo_FH? Number of observations used for FHmeta.numberintnullableFK? Mean K band fluxmJyphot.flux.density;em.IR.K;stat.meanfloatnullablee_FK? Weighted standard deviation of FKmJystat.errorfloatnullableo_FK? Number of observations used for FKmeta.numberintnullableJ/ApJ/789/135/table8Computed Spectral IndicesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject identifiermeta.id;meta.maincharprimaryNumEpoch numbermeta.idintRJD-NonEarliest RJD date within epoch of non-gamma-ray observationsdtime.epochdoubleagammaGamma-ray spectral indexspect.index;em.gammafloate_agamma? The 1{sigma} uncertainty in agammastat.errorfloatnullableaX? X-ray spectral indexspect.index;em.X-rayfloatnullablee_aX? The 1{sigma} uncertainty in aXstat.errorfloatnullableaOOptical spectral indexspect.index;em.optfloate_aOThe 1{sigma} uncertainty in aOstat.errorfloatNptsNumber of UV/Opt/NIR points usedmeta.numberintStDev? Standard deviation of the datastat.stdevfloatnullableaOX? X-ray/optical spectral indexspect.indexfloatnullablee_aOX? The 1{sigma} uncertainty in aOXstat.errorfloatnullableaXgamma? Gamma-ray/X-ray spectral indexspect.indexfloatnullablee_aXgamma? The 1{sigma} uncertainty in aXgammastat.errorfloatnullableBandUV/Opt/NIR band used if no V-band data availableinstr.bandpasscharJ/ApJ/789/135/table7Epochs Selected For StudyNumEpoch numbermeta.idintNameObject identifiermeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRJD-NonEarliest RJD date within epoch of non-gamma-ray observationsdtime.epochdoubleSpanElapsed timespan of non-gamma-ray observationsdtime.intervalfloatRJD-ObsRJD of Fermi observation, mid-bindobs.param;obsdoubleBinFermi observation bin sizedspect.binSize;obsfloatG-ActActivity state code in gamma-rays (1)meta.codecharX-ActActivity state code in X-rays (1)meta.codecharW2-ActActivity state code in uvw2 (1)meta.codecharM2-ActActivity state code in uvm2 (1)meta.codecharW1-ActActivity state code in uvw1 (1)meta.codecharU-ActActivity state code in U band (1)meta.codecharB-ActActivity state code in B band (1)meta.codecharV-ActActivity state code in V band (1)meta.codecharR-ActActivity state code in R band (1)meta.codecharI-ActActivity state code in I band (1)meta.codecharJ-ActActivity state code in J band (1)meta.codecharH-ActActivity state code in H band (1)meta.codecharK-ActActivity state code in K band (1)meta.codechar