Theoretical Re-evaluations of Scaling Relations between SMBHs and Their Host Galaxies—1. Effect of Seed BH Mass

Frontiers in Astronomy and Space Sciences

Shirakata, Hikari¹  Okamoto, Takashi¹  Kawaguchi, Toshihiro²  Oogi, Taira³  Enoki, Motohiro⁴  Matsuoka, Yoshiki⁵  Makiya, Ryu⁶  Kobayashi, Masakazu A. R.⁶  Ishiyama, Tomoaki⁷  Nagashima, Masahiro⁸ 

[1] Department of Cosmosciences, Graduate School of Science, Hokkaido University, Sapporo, Japan;Department of Economics, Management and Information Science, Onomichi City University, Onomichi, Japan;Faculty of Business Administration, Tokyo Keizai University, Kokubunji, Japan;Faculty of Education, Bunkyo University, Koshigaya, Japan;Institute of Management and Information Technologies, Chiba University, Chiba, Japan;Kavli Institute for the Physics and Mathematics of the Universe, Todai Institutes for Advanced Study, University of Tokyo, Kashiwa, Japan;Max-Planck-Institut fur Astrophysik, Garching, Germany;Research Center for Space and Cosmic Evolution, Ehime University, Matsuyama, Japan

关键词: Galaxies;    active galactic nuclei;    Bulge;    galaxy formation;    statistics;   

DOI  :  10.3389/fspas.2017.00015

学科分类：空间科学

来源: Frontiers

【 摘 要 】

We explore the effect of varying the mass of a seed black hole on the resulting black hole mass -- bulge mass relation at $z \sim 0$, using a semi-analytic model of galaxy formation combined with large cosmological N-body simulations. When the mass of the seed is set at $10^5 M_\odot$, we find that the model results become inconsistent with recent observational results of the black hole mass -- bulge mass relation for dwarf galaxies. On the other hand, when we employ seed black holes of $10^3 M_\odot$ or select their mass randomly within a $10^{3 -5} M_\odot$ range, the resulting relation is consistent with observational results including the dispersion. We also find that black hole mass -- bulge mass relations for less massive bulges at $z \sim 0$ put stronger constraints on the seed BH mass than the relations at higher redshifts.

【 授权许可】

CC BY