Name : Toshikazu Ebisuzaki E-mail : ebisu@peta.co.jp TITLE : Formation of Supermassive Black Hole and Stellar and Molecular Particle Simultions ABSTRACT : Supermassive black holes appear to be generic components of galaxies. These central supermassive black holes are the remnants of active galactic nuclei (quasars, blazars, BL Lac objects and others) in the past. However, the formation process of massive blackholes has been totally unknown. Matsumoto et al. (2000) found that compact X-ray sources in the nucleus regions of star-burst galaxy, M82 are intermediate mass ($10^2 \sim 10^5$M$_{\odot}$) black holes. This discovery beautifully bridges from stellar mass black holes ($\sim 10 $M$_{\odot}$) to supermassive blackholes ($\sim 10^6$M$_{\odot}$). We, encouraged by this discovery, proposed the following two-step formation process. First, an intermediate mass ($10^2 \sim 10^3$M$_{\odot} $) blackhole, like Matsumoto et al. founded, is formed by runaway merging of the massive stars (not stellar mass blackhole) sinking down to the center of the dense stellar cluster in the starburst galaxy. Meanwhile, the clusters with an intermediate mass blackhole sink into the nucleus of their parent galaxy by the dynamical friction and leave them at nucleus of galaxy. These intermediate blackholes merges each other by three-body interactions to form a supermassive blackhole. The stellar and molecular particle simulations to analyse this process and its implication to cosmic-ray acceleration are discussed.