Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..408..148k&link_type=abstract
The Starburst-AGN Connection. ASP Conference Series, Vol. 408, proceedings of the conference held 27-31 October 2008, at Shangha
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We propose a new evolutionary model of a supermassive black hole (SMBH) and a circumnuclear disk (CND), taking into account the mass-supply from a host galaxy and the physical states of CND. In the model, two distinct accretion modes depending on gravitational stability of the CND play a key role on accreting gas to a SMBH. (i) If the CND is gravitationally unstable, energy feedback from supernovae (SNe) supports a geometrically thick, turbulent gas disk. The accretion in this mode is dominated by turbulent viscosity, and it is significantly larger than that in the mode (ii), i.e., the CND is supported by gas pressure. Once the gas supply from the host is stopped, the high accretion phase changes to the low one (mode (ii)), but there is a delay with ˜ 108 yr. Through this evolution, the gas-rich CND turns into the gas poor stellar disk. We found that not all the gas supplied from the host galaxy to the central 100 pc region accrete onto the SMBH even in the high accretion phase (mode (i)), because the part of gas is used to form stars. Moreover, a super-Eddington accretion is possible in the high accretion phase and thus the its condition is briefly discussed.
Kawakatu Nozomu
Wada Keiichi
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