Appearance of an accretion disk perturbed by fractional Brownian Motion density

Abstract

This paper aims to investigate/map the effects that perturbations applied to an accretion disk might produce on the registered Light Curves (LC). The case of accretion disks around supermassive active black holes (AGNs) is studied with the goal to explain some of the statistical properties of the observed IntraDay Variability (IDV). The region producing optical IDV is perturbed by allowing it to develop a mass density of a fractional Brownian Motion-like type. The light curves and spectral slopes are calculated and compared to observational data for different Hurst parameters. The spectral slopes of the simulated light curves vary in the range $(0.4,2.5)$. The agreement with observational data shows that a magnetized disk subjected to stochastic perturbations can produce some of the features observed in the light curves.

Accepted to be published in MNRAS

References in corpus (5)

• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• X-ray Variability of the Seyfert 1 Markarian 335: Power Spectrum and Time Lags
• Rapid optical variability in blazar S5 0716+71 during 2010 March
• Accretion Disks and the Nature and Origin of AGN Continuum Variability
• Power Spectral Distribution of the BL Lacertae Object S5 0716+714

Cited by in corpus (1)

• The Stochastic-Dissipative Störmer Problem-Trajectories and Radiation Patterns