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Order and Chaos in Accretion Disks of Active Galactic Nuclei

Published online by Cambridge University Press:  12 April 2016

Abraham C.-L. Chian
Abraham C.-L. Chian*
Affiliation:
National Institute for Space Research – INPE, P.O. Box 515, 12201–970 Sāo José dos Campos – SP, Brazil

Abstract

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Langmuir turbulence plays an important role in electron heating and generation of plasma emission in accretion disks of active galactic nuclei. The nonlinear dynamical behavior of Langmuir turbulence and its relevance in the interpretation of AGN variability is discussed. In particular, we study nonlinear saturation of the Langmuir stimulated modulational instability, for which the low-frequency mode is a resonant ion-acoustic wave. The nonlinear system of coupled wave equations is shown to undergo transition from order to chaos via the route of quasiperiodicity. The periodic, quasiperiodic and chaotic variabilities in AGN emissions may be the electromagnetic signatures of the ordered and chaotic states of Langmuir turbulence in accretion disks or jets of AGN.

Type
Part 14. AGN and Galactic Centre
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 663 - 666
Copyright
Copyright © Astronomical Society of the Pacific 1997

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