Feedback Limits Rapid Growth Seed BHs at High Redshift. Jianmin Wang, Yanmei Chen , Chen Hu Institute of High Energy Physics. Outline. Background and Motivation Growth: Feedback Limit Radiation pressure Compton heating Outflow Discussion Conclusion. Background: observations.
Jianmin Wang,Yanmei Chen, Chen Hu
Institute of High Energy Physics
BHBackground: Volonteri & Rees (2005)
One way to form supermassive BHs:
For MBHs in halos with , the accretion radius is then well within the
disc, surrounded by gas with almost constant density , and thus a quasi-spherical
OutflowMotivation: Can supermassive BHs form with feedback ?
The feedback from the radiation pressure is negligible
quasar PG 1211+143 ( Pounds et al. 2003)
some X-ray sources (Mukai et al. 2003, Fabbiano et al. 2003)
SS 433 (Kotani et al. 1996)
1、Direct collapse of primordial clouds (Loeb 1993, Loeb & Rossio 1994)
2、Accretion of dark matter will not suffering from feedback (Hu et al. 2005)
3、The inevitable fate of a compact cluster is the formation of a supermassive black hole (Quinlan & Shapiro 1990)
A rapid growth of the seed BH are greatly suppressed and they are hardly able to grow up unless the strong feedback can be avoided, for example considering the anisotropy of the radiation from the tiny accretion disk。