Recent progress in our research about general relativistic radiation transfer around a rotating black hole will be presented. Both of optically thin and thick cases are considered. Based on the recent theoretical calculations for the relativistic accretion flows (Takahashi, 2007, MNRAS in press, arXiv:astro-ph/07050048), we have calculated the general relativistic accretion flow model for the black holes in the galactic centers. Based on the recent theoretical calculations for the relativistic accretion flows (Takahashi, 2007, MNRAS in press, arXiv:astro-ph/07050048), we have calculated the general relativistic accretion flow model for the black holes in the galactic centers. After explaning the general relativisitc accretion flow models in the galactic center, our recent calculations about the observational feasibility of the black hole shadow by the future-interferometer will be presented. |