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8.11. Magnetic avalanche model of mass supply in active galactic nuclei

Published online by Cambridge University Press:  25 May 2016

T. Kuwabara
Affiliation:
Department of Physics, Faculty of Science, Chiba University, 1-33 Yayoi-Cho, Inage-ku, Chiba 263, Japan
R. Matsumoto
Affiliation:
Department of Physics, Faculty of Science, Chiba University, 1-33 Yayoi-Cho, Inage-ku, Chiba 263, Japan
K. Shibata
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181, Japan

Extract

We present the results of axisymmetric, two-dimentional magnetohydrodynamic (MHD) simulations of weakly ionized gas torus threaded by large scale vertical magnetic fields. The gas torus corresponds to the 100pc scale circumnuclear torus observed by HST in nearby AGNs (e.g. NGC4261) or 1010 M circumnuclear gas found by CO observations in luminous IR galaxies and quasars (e.g. Scoville et al. 1991). The initial state of simulation is a constant angular momentum polytropic torus threaded by uniform vertical magnetic fields. The torus is assumed to be rotating in a static, spherical hot halo. The model parameters are Eth = v s0 2/(γv k0 2) = 5 ×10−3 and Eth = v A0 2/v K0 2 = 6.6×10−6 where γ is the adiabatic index and vs 0 and va 0 are the sound speed and the Alfvén speed at r = r 0 respectively.

Type
Part II. Nuclear Interstellar Medium
Copyright
Copyright © Kluwer 1998 

References

Gammie, C.F. (1996) ApJ, 457, 355362.CrossRefGoogle Scholar
Matsumoto, R., Uchida, Y., Hirose, S., Shibata, K., Hayashi, M.R., Ferrari, A., Bodo, G., & Norman, C. (1996) ApJ, 461, 115126.CrossRefGoogle Scholar
Scoville, N.Z., Sargent, A.I., Sanders, D.B., Soifer, B.T. (1991) ApJ, 366, L5L9.CrossRefGoogle Scholar

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