Radiatively Driven Instabilities in Accretion Flows

Details Radiatively Driven Instabilities in Accretion Flows Radiatively Driven Instabilities in Accretion Flows

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.5303t&link_type=abstract

American Astronomical Society, HEAD meeting #7, #53.03; Bulletin of the American Astronomical Society, Vol. 35, p.660

Physics

Scientific paper

Radiative diffusion is often a significant source of damping of acoustic waves in astrophysical fluids. However, in a stratified medium with a background radiative flux, acoustic waves can be driven unstable by periodic radiative forcing. We believe this to be the basic physical mechanism behind a variety of instabilities that have been discussed in the literature, including hydrodynamic strange modes in stars and so-called ``photon bubble modes'' in radiation pressure supported accretion flows around black holes. We elucidate the basic physics of these instabilities, and also present simulations of their nonlinear evolution. Finally, we show how they may manifest themselves in observed spectral energy distributions and polarization. This work is supported by NSF grant AST-9970827 and a UCSB/Los Alamos CARE grant.

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