Power Spectrum Density of Stochastic Oscillating Accretion Disk |
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| Authors: | G?B?Long J?W?Ou Email author" target="_blank">Y?G?ZhengEmail author |
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| Institution: | 1.Department of Physics,Yunnan Normal University,Kunming,China. |
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| Abstract: | In this paper, we employ a stochastic oscillating accretion disk model for the power spectral index and variability of BL Lac object S5 0716+714. In the model, we assume that there is a relativistic oscillation of thin accretion disks and it interacts with an external thermal bath through a friction force and a random force. We simulate the light curve and the power spectrum density (PSD) at (i) over-damped, (ii) critically damped and (iii) under-damped cases, respectively. Our results show that the simulated PSD curves depend on the intrinsic property of the accretion disk, and it could be produced in a wide interval ranging from 0.94 to 2.05 by changing the friction coefficient in a stochastic oscillating accretion disk model. We argue that accretion disk stochastic oscillating could be a possible interpretation for observed PSD variability. |
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