Are the Variations in Quasar Optical Flux Driven by Thermal Fluctuations
作者： Jill Bechtold , Brandon C. Kelly , Brandon C. Kelly , Aneta Siemiginowska
DOI: 10.1088/0004-637X/698/1/895
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摘要: We analyze a sample of optical light curves for 100 quasars, 70 which have black hole mass estimates. Our is the largest and broadest used yet modeling quasar variability. The sources in our z < 2.8, 1042 λL λ(5100 A) 1046, 106 M BH/M ☉ 1010. model as continuous time stochastic process, providing natural means estimating characteristic timescale amplitude variations. employ Bayesian approach to estimate flux variations; not affected by biases introduced from discrete sampling effects. find that timescales strongly correlate with luminosity, are consistent disk orbital or thermal timescales. In addition, short-timescale variations significantly anticorrelated luminosity. interpret fluctuations resulting driven an underlying such turbulent magnetic field. intranight implied empirical 0.02 mag, current microvariability observations radio-quiet quasars. therefore able unify both long- quasars same while radio-loud additional variability component operates on 1 day.
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