Breathing oscillations in a global simulation of a thin accretion disc

摘要: We study the oscillations of an axisymmetric, viscous, radiative, general relativistic hydrodynamical simulation a geometrically thin disk around non-rotating, $6.62\,M_\odot$ black hole. The numerical setup is initialized with Novikov-Thorne, gas-pressure-dominated accretion disk, initial mass rate $\dot{m} = 0.01\,L_\mathrm{Edd}/c^2$ (where $L_\mathrm{Edd}$ Eddington luminosity and $c$ speed light). Viscosity treated $\alpha$-prescription. was evolved for about $1000$ Keplerian orbital periods at three Schwarzschild radii (ISCO radius). Power density spectra radial vertical fluid velocity components, total (gas $+$ radiation) midplane pressure, component radiative flux from photosphere, all reveal strong power local breathing oscillation frequency. first, second third harmonics are also clearly seen in data. quantify properties these by extracting eigenfunctions components pressure. This confirms that associated motion.