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Oscillations of the Inner Regions of Viscous Accretion Disks
Chi-kwan Chan
Although quasi-periodic oscillations (QPOs) have been discovered in different X-ray sources, their origin is still a matter of debate. Analytical studies of hydrodynamic accretion…
Viscous, Resistive Magnetorotational Modes
Martin E. Pessah, Chi-kwan Chan
We carry out a comprehensive analysis of the behavior of the magnetorotational instability (MRI) in viscous, resistive plasmas. We find exact, non-linear solutions of the non-ideal…
Angular Momentum Transport in Accretion Disks: Scaling Laws in MRI-driven Turbulence
Martin E. Pessah, Chi-kwan Chan, Dimitrios Psaltis
We present a scaling law that predicts the values of the stresses obtained in numerical simulations of saturated MRI-driven turbulence in non-stratified shearing boxes. It relates…
Spectral Methods for Time-Dependent Studies of Accretion Flows. III. Three-Dimensional, Self-gravitating, Magnetohydrodynamic Disks
Chi-kwan Chan, Dimitrios Psaltis, Feryal Ozel
Accretion disks are three-dimensional, turbulent, often self-gravitating, magnetohydrodynamic flows, which can be modeled in detail with numerical simulations. In this paper, we pr…
The fundamental difference between shear alpha viscosity and turbulent magnetorotational stresses
Martin E. Pessah, Chi-kwan Chan, Dimitrios Psaltis
Numerical simulations of turbulent, magnetized, differentially rotating flows driven by the magnetorotational instability are often used to calculate the effective values of alpha…
MHD Simulations of Accretion onto Sgr A*: Quiescent Fluctuations, Outbursts, and Quasi-Periodicity
Chi-kwan Chan, Siming Liu, Christopher L. Fryer +4
High resolution observations of Sgr A* have revealed a wide variety of phenomena, ranging from intense rapid flares to quasi-periodic oscillations, making this object an ideal syst…