Modeling quasar UV/Optical variability with the corona-heated accretion-disk reprocessing (CHAR) model

Mouyuan Sun, Yongquan Xue, Hengxiao Guo, Junxian Wang, W. N. Brandt, Jonathan R. Trump, Zhicheng He, Tong Liu, Jianfeng Wu, Haikun Li

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9 Scopus citations


The rest-frame UV/optical variability of the quasars in the Sloan Digital Sky Survey Stripe 82 is used to test the Corona-Heated Accretion-disk Reprocessing (CHAR) model of Sun et al. We adopt our CHAR model and the observed black hole masses (MBH) and luminosities (L) to generate mock light curves that share the same measurement noise and sampling as the real observations. Without any fine-tuning, our CHAR model can satisfactorily reproduce the observed ensemble structure functions for different MBH, L, and rest-frame wavelengths. Our analyses reveal that a luminosity-dependent bolometric correction is disfavored over the constant bolometric correction for UV/optical luminosities. Our work demonstrates the possibility of extracting quasar properties (e.g., the bolometric correction or the dimensionless viscosity parameter) by comparing the physical CHAR model with quasar light curves.

Original languageEnglish (US)
Article number7
JournalAstrophysical Journal
Issue number1
StatePublished - Oct 10 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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