J/AJ/159/259ivo://CDS.VizieR/J/AJ/159/259doi:10.26093/cds/vizier.51590259CDSSobrino Figaredo C.Haas M.Ramolla M.Chini R.Blex J.Hodapp K.W.,Murphy M.Kollatschny W.Chelouche D.Kaspi S.2021-04-30T14:16:15Z2020-08-24T08:54:51ZCDS support team

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

cds-question@unistra.frquasarsinfrared-photometryvisible-astronomybroad-band-photometryWe monitored the z=0.158 quasar 3C273 between 2015 and 2019 in the optical (BVrz) and near-infrared (JHK) with the aim to perform dust reverberation mapping. Accounting for host galaxy and accretion disk contributions, we obtained pure dust light curves in JHK. Cross correlations between the V-band and the dust light curves yield an average rest-frame delay for the hot dust of {tau}cent~410days. This is a factor of two shorter than that expected from the the dust ring radius R_x_~900lt-day reported from interferometric studies. The dust covering factor (CF) is about 8%, much smaller than that predicted from the half covering angle of 45{deg} found for active galactic nuclei (AGNs). We analyze the asymmetric shape of the correlation functions and explore whether an inclined biconical bowl-shaped dust torus geometry could bring these findings ({tau}cent, Rx and CF) into a consistent picture. The hot varying dust emission originates from the edge of the bowl rim with a small covering angle 40{deg}<{theta}<45{deg}, and we see only the near side of the biconus. Such a dust gloriole with R_x_= 900{+/-}200lt-day and an inclination 12{deg} matches the data remarkably well. Comparing the results of 3C273 with literature for less luminous AGN, we find a lag-luminosity relation {tau}{prop}L{alpha} with {alpha}=0.33-0.40, flatter than the widely adopted relation with {alpha}~0.5. We address several explanations for the new lag-luminosity relation.2020AJ....159..259Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/259CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)J/A+A/506/569 : BEST-II periodic variables in CoRoT LRa02 field (Kabath+,2009)J/AN/333/706 : Bochum survey of the southern Galactic disk (Haas+, 2012)J/ApJ/756/73 : gri light curves of low-luminosity AGN NGC 4395 (Edri+, 2012)J/ApJ/788/159 : 17 Seyfert 1 galaxies light curves (Koshida+, 2014)J/A+A/561/L8 : BRJK photometry of Seyfert galaxy WPVS48 (Pozo Nunez+, 2014)J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)J/ApJ/825/126 : SEAMBHs. V. The third year (Du+, 2016)J/ApJ/846/98 : Jet kinematics of blazars at 43GHz with VLBA (Jorstad+, 2017)J/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)J/MNRAS/465/L114 : OGLE16aaa UVOT light curves (Wyrzykowski+, 2017)J/A+A/620/A137 : CCD B,V,R,I,Ha photometry of 3C120 (Ramolla+, 2018)J/ApJ/854/107 : Light curves of 2 Seyfert 1 galaxies (Fausnaugh+, 2018)J/ApJ/856/6 : SEAMBHs IX. 10 new H{beta} light curves (Du+, 2018)J/ApJ/866/133 : Continuum-H{beta} light curves of 5 Seyfert 1 (De Rosa+, 2018)J/ApJ/871/108 : Lick AGN monitoring project 2011: V band (Pancoast+, 2019)J/ApJS/245/25 : WISE Extended Source Catalog (WXSC). I. (Jarrett+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/259https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/259http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/259https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/259https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/259http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/259GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/159/259/figure13C 273 normalized light curvesTelTelescope used (1)instr.setupcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltFilter used (B, V, r, z, Jn, Hn, Ks)instr.setup;instr.filtercharMJD[57134/58622] Modified Julian Datedtime.epochdoubleFlux[21.2/82.9] Observed flux in FiltermJyphot.flux.densityfloate_Flux[0/2.93] Uncertainty in FluxmJystat.error;phot.fluxfloat