Accretion models of Sgr A*

The supermassive black hole in the center of our Galaxy, Sgr A*, is unique because the angular size of the black hole is the largest in the sky thus providing detailed boundary conditions on, and much less freedom for, accretion fbw models. In this paper I review advection-dominated accretion fbw (ADAF; another name is radiatively inefficient accretion fbw) models for Sgr A*. This includes the dynamics and developments of ADAFs, and how to explain observational results including the multi-waveband spectrum, radio polarization, IR, and X-ray flares, and the size measurements at radio wavebands