Gravitational waves from merging intermediate-mass black-holes @JGRG26,Osaka City U., 2016/10/24-28 http://www.oit.ac.jp/is/~shinkai/ How many BH mergers ? Hisa-aki Shinkai, Nobuyuki Kanda & Toshikazu Ebisuzaki (Osaka Inst. Technology / Osaka City Univ. / RIKEN) Outline & Summary How many BHs in a galaxy? P30 真貝寿明(大阪工業大),神田展行(大阪市立大),戎崎俊一(理化学研究所) IMBH inspiral at Space Interferometers ApJ 614 (2004) 864 How many galaxies in the Universe? A route to a SMBH IMBH ringdown freq. is within KAGRA band Event Rates at KAGRA