On the Warped Disk in NGC 4258

概要

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We investigate evolution of the warped disk induced by torque due to radiation pressure from the central object. The warp is treated as a small perturbation on to a standard disk model around a supermassive black hole. We derive simultaneous differential equations which govern the development of the warp. Applying our procedure to NGC 4258, we specify the mass of the black hole M=3.9x10^7 M_sun, the accretion rate M=8.6x10^-4 M_sun yr^-1 and the luminosity L=1.0x10^44 erg s^-1. The initial small tilt angle of the disk grows by a factor of 54 during 10 Gyr. It is found that the resulting warped disk can be well superposed on the observed map of water maser emitting clouds.