Next generation AO system of Subaru Telescope

Conceptual and feasibility studies of wide field AO systems for Subaru Telescope has been started as a next generation AO system. Since optical wide field imager, named Hyper Supreme Camera, and multi object fiber-fed spectrograph, named Prime Focus Spectrograph, are currently under developing for a primary focus of Subaru Telescope, a wide field imager and spectrograph at near infrared wavelength range with adaptive optics at Cassegrain or Nasmyth foci must be a complemental instrument in the next future. In this paper, preliminary performance simulation studies of GLAO and MOAO and science case study in imaging and spectrograph are introduced. A GLAO simulation tells us that stellar image size is almost uniform up to 20 arcmin FOV. We found that a number of tip-tilt guide star and its constellation is closely related to the performance of MOAO. Imaging sensitivity gain is expected about 0.5 magnitude for the point source and 0.3 to 0.4 magnitude for compact galaxies, whose effective radius is smaller than 3 kpcs at the redshift around 2. On the other hand, the analysis of a spectroscopy observation to investigate kinematics of high redshift galaxies seems to be not easy using GLAO.