J/ApJS/262/43ivo://CDS.VizieR/J/ApJS/262/43doi:10.26093/cds/vizier.22620043CDSYuan Y.H.Wang G.G.Xiao H.B.Fan J.H.Huang H.R.Ding G.Z.Wen G.Z.,Wu F.J.2023-10-03T13:00:51Z2022-12-19T08:20:49ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomyWide-band photometryquasarsBased on the database monitored by the 1.26m National Astronomical Observatory-Guangzhou University Infrared/Optical Telescope, we studied the optical variabilities of FSRQ 3C454.3. The monitoring period was from 2016 October 17 to 2018 December 14, and there were 6701 observations covering the g, r, and i bands (2196 at the g band, 2214 at the r band, and 2291 at the i band). (1) The maximum variabilities were {Delta}m_g_=2.806+/-0.124mag at the g band; {Delta}m_r_=2.365+/-0.160mag at the r band; and {Delta}m_i_=3.126+/-0.070mag at the i band. (2) Among the gri intraday lightcurves, there are 172 portions of the data sets showing intraday variability (IDV). The distributions of IDV timescales ({Delta}T) can be profiled by a three-order Gaussian function, with the center values {Delta}T_1_=17.18min, {Delta}T_2_=34.91min, and {Delta}T_3_=68.92min. These results imply that the origin of IDVs is very complicated. (3) Based on the IDV timescales, we obtained the emission size R<=7.17x10^15^cm, fixed the broad-line region and modeled the spectral energy distributions. (4) We used the Jurkevich method, red-noise fitting, and the weighted wavelet Z-transform to analyze the long-term variabilities and obtained indications of a possible period of P=2.92+/-0.85yr, and used the binary black hole system to explain this period. Based on the long-term period, we can estimate the time until merger of the binary black hole, t_merge_=6.69x10^3^yr, and the luminosity of gravitational waves, L_G_=1.56x10^48^erg/s.2022ApJS..262...43Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/262/43CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/127/445 : Gamma-ray loud blazars opt. monitoring. II. (Raiteri+ 1998)J/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)J/ApJS/148/97 : The WMAP First Year Source Catalog (WMAP1) (Bennett+, 2003)J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)J/ApJ/712/405 : Multiwavelength obs. of 3C 454.3 III. (Vercellone+, 2010)J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)J/ApJ/837/45 : 2006-2012 Rc-band & 4.8GHz obs. of AO 0235+164 (Fan+, 2017)J/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)J/ApJ/856/80 : 6-yr optical monitoring of the FSRQ 3C 454.3 (Fan+, 2018)J/MNRAS/477/4749 : gamma-rays in Fermi blazars (Costamante+, 2018)J/ApJ/906/5 : 3C 454.3 FeII, MgII & 3000{AA} data (Amaya-Almazan+, 2021)J/ApJS/253/10 : 12yrs of R-band phot. of the quasar 3C 454.3 (Fan+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/262/43https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/262/43http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/262/43https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/262/43https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/262/43http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/262/43GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJS/262/43/table2The gri observational of 3C454.3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJD-g[679/1471.71]? Julian Date of g-band observation; JD-2457000dtime.epochdoublenullablegmag[15.46/18.27]? Apparent g-band AB magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag[0/0.14]? Uncertainty in gmagmagstat.error;phot.magfloatnullableJD-r[679/1471.71]? Julian Date of r-band observation; JD-2457000dtime.epochdoublenullablermag[14.75/17.12]? Apparent r-band AB magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag[0/0.15]? Uncertainty in rmagmagstat.error;phot.magfloatnullableJD-i[679/1471.71] Julian Date of i-band observation; JD-2457000dtime.epochdoubleimag[14.07/17.2] Apparent i-band AB magnitudemagphot.mag;em.opt.Ifloate_imag[0/0.2] Uncertainty in imagmagstat.error;phot.magfloatJ/ApJS/262/43/idvThe intraday variability (IDV) results of FSRQ 3C454.3 at g band (Table 3), r band (Table 4) and i band (Table 5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltFilter of the observationmeta.code;instr.filtercharDateObservation datetime.epoch;obscharN[2/88]? Number of paired observationsmeta.numberintnullableAm[0/129]? Heidt & Wagner 1996A&A...305...42H variability valuesrc.var.indexfloatnullableFTest[0.3/704]? F-test intra-day variability valuesrc.var.indexfloatnullableANOVA[0.8/79.3]? ANOVA test intra-day variability valuesrc.var.indexfloatnullableFc99[1.8/99]? Critical F value at 1% significancestat.fit.paramfloatnullableFc99.9[2/999]? Critical F value at 0.1% significancestat.fit.paramfloatnullableVarVariability type (V=variable; N=nonvariable)meta.code;src.varcharDeltaT[5.7/223.2]? Variable timescalemintime.scalefloatnullabledelmag[0.02/1.3]? Variability magnitudemagphot.magfloatnullablee_delmag[0/0.21]? Uncertainty in delmagmagstat.error;phot.magfloatnullabledelmag/sig[0.47/35.7]? Delmag divided by its uncertaintystat.errorfloatnullable