tokens: We are grateful to M. Mori, K. Yoshikawa, A. Y. Wagner, A. Burkert, F. Nakamura, H. Yajima, and A. Inoue for fruitful discussion. The numerical simulations have been performed with coma provided by Interdisciplinary Computational Science Program in Center for Computational Sciences, University of Tsukuba, and with cray xc30 at Center for Computational Astrophysics, NAOJ. This research was supported in part by Grant-in-Aid for Scientific Research (B) by JSPS (15H03638) (MU) and a grant from NAOJ (KH).
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