J/ApJ/964/167ivo://CDS.VizieR/J/ApJ/964/167CDSLiu T.Edelson R.Hernandez Santisteban J.V.Kara E.Montano J.,Gelbord J.Horne K.Barth A.J.Cackett E.M.Kaplan D.L.2026-08-07T08:05:43Z2026-08-07T09:02:58ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsultraviolet-photometryvisible-astronomybroad-band-photometryinfrared-photometryWe present an intensive multiwavelength monitoring campaign of the quasar PG 1302-102 with Swift and the Las Cumbres Observatory network telescopes. At z~0.3, it tests the limits of the reverberation mapping (RM) technique in probing the accretion disk around a supermassive black hole (SMBH) and extends the parameter space to high masses and high accretion rates. This is also the first time the RM technique has been applied to test disk structures predicted in the SMBH binary model that has been suggested for this source. PG 1302-102 was observed at a ~daily cadence for ~9 months in 14 bands spanning from X-ray to UV and optical wavelengths, and it shows moderate to significant levels of variability correlated between wavelengths. We measure the interband time lags, which are consistent with a {tau}{propto}{lambda}^4/3^ relation as expected from standard disk reprocessing, albeit with large uncertainties. The disk size implied by the lag spectrum is consistent with the expected disk size for its black hole mass within uncertainties. While the source resembles other reverberation-mapped active galactic nuclei in many respects, and we do not find evidence supporting the prevalent hypothesis that it hosts an SMBH binary, we demonstrate the feasibility of studying SMBH binaries from this novel angle and suggest possibilities for the LSST Deep Drilling Fields.2024ApJ...964..167Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/964/167CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/207 : Palomar-Green catalog UV-excess stellar objects (Green+ 1986)III/157 : An Ultraviolet Atlas of Quasar and Blazar Spectra (Kinney+, 1991)VIII/85 : SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009)VIII/104 : SPECFIND V3.0 Catalog of radio continuum spectra (Stein+, 2021)I/358 : Gaia DR3 Part 4. Variability (Gaia Collaboration, 2022)I/361 : Gaia Focused Product Release (Gaia FPR) (Gaia Collaboration, 2023)J/ApJ/676/262 : PKS1302-102 intergalactic absorption system (Cooksey+, 2008)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/MNRAS/438/3058 : 15GHz variability of {gamma}-ray blazars (Richards+, 2014)J/MNRAS/453/1562 : CRTS close supermassive black hole binaries (Graham+, 2015)J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)J/AJ/152/25 : The UV-bright Quasar Survey (UVQS) DR1 (Monroe+, 2016)J/ApJ/821/56 : Space telescope RM project. III. LCs (Fausnaugh+, 2016)J/ApJ/840/41 : X-ray/UV Swift monitoring of NGC 4151 (Edelson+, 2017)J/ApJS/233/17 : Swift/BAT AGN sp. survey. V. X-ray data (Ricci+, 2017)J/ApJ/870/123 : Swift optical & UV flux of four AGNs (Edelson+, 2019)J/ApJ/896/1 : SEAMBHs. XI. Mrk 142 X-ray to optical LCs (Cackett+, 2020)J/ApJS/261/2 : BASS. XXII. Swift/BAT AGN Sp. Survey DR2 cat. (Koss+, 2022)J/ApJ/947/62 : griz light curves of Mrk 335 (Kara+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/964/167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/964/167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/964/167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/964/167https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/964/167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/964/167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticalInfrareddefaultJ/ApJ/964/167/table2Swift UV and optical light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBandSwift/UVOT filter identifiermeta.code;instr.filtercharMJD[59551/59816.1] Modified Julian Datedtime.epochdoubleFlux[3.16/21.02] Observed flux in Band; 10^-15^erg/s/cm^2^/{AA}1e-17W.m**-2.nm**-1phot.flux.densityfloate_Flux[0.08/0.8] Uncertainty in Flux1e-17W.m**-2.nm**-1stat.error;phot.fluxfloatJ/ApJ/964/167/table3Inter-calibrated LCO light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[BVugriz] LCO filter identifiermeta.code;instr.filtercharMJD[59256.3/60172.5] Modified Julian Datedtime.epochdoubleFlux[2.53/5.34] Observed flux in BandmJyphot.flux.densityfloate_Flux[0.009/0.2] Uncertainty in FluxmJystat.error;phot.fluxfloat