Investigation of Activity and Evolution of Young Radio Galaxies with Japan-Korea Joint Radio Interferometer

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We successfully carried out wideband radio-interferometric observations with the new disk-based observation system to investigate activity and evolution of young radio galaxies, for which a high sensitivity data acquisition system is required. We also made simultaneous observations with Yamaguchi 32-m radio telescope and Korean VLBI Network toward active galaxies which show short-term variability, and obtained new results on the variability feature at mm-wavelength. We concurrently performed numerical calculations of the wideband spectral energy distribution toward a nucleus of a radio galaxy on the basis of an accretion disk model, and successfully reproduce the observed spectral features from radio to X-ray.