recordatori [SEMINARI] Influence of self-gravity on the runaway instability of black ,hole-torus systems

[Enric Marco]

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Influence of self-gravity on the runaway instability of black 
hole-torus systems
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Pedro Montero 
(Max-Planck-Institut für Astrophysik, Garching, Deutschland)

Dimecres 19 de maig 2010

Hora: 15:00 h

Lloc: Seminari del Departament d'Astronomia i Astrofísica

Abstract:

Results from the first fully general relativistic numerical
simulations in axisymmetry of a system formed by a black hole
surrounded by a self-gravitating torus in equilibrium are presented,
aiming to assess the influence of the torus self-gravity on the onset
of the runaway instability. We consider several models with varying
torus-to-black hole mass ratio and angular momentum distribution
orbiting in equilibrium around a non-rotating black hole. The tori are
perturbed to induce the mass transfer towards the black hole. Our
numerical simulations show that all models exhibit a persistent phase
of axisymmetric  oscillations around their equilibria for several
dynamical timescales without the appearance of the runaway
instability, indicating that the self-gravity of the torus does not
play a critical role favoring the onset of the instability, at least
during the first few dynamical timescales.

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 Dr. Enric Marco
 Departament d'Astronomia i Astrofísica
 Facultat de Física
 Universitat de València
 C/  Dr. Moliner, 50
 46100 Burjassot, Spain
 Phone: (34)-96-354-3069
 Fax:(34)-96-354-3084
 enric.marco en uv.es
 http://www.uv.es/marco
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