Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cnoc.conf...33m&link_type=abstract
The Second National Conference on Astrophysics of Compact Objects, held in Bologna (Italy), September 19 - 21, 2001, p. 33
Astronomy and Astrophysics
Astrophysics
Scientific paper
When the accretion flow onto a relativistic compact object has low angular momentum it is possible the formation of shocks with a steady location. The shock position depends on three parameters: the initial temperature and the initial angular momentum and the viscosity parameter alpha. It has already been shown by recent works that, over this stable position, significant variability can be produced in many different ways. We may have: pure fluid dynamical variabilities, cooling and viscosity induced variability, furthermore one due to the breaking of the azimuthal symmetry and another due to the breaking of the reflection symmetry of the disk at the equatorial plane. This last type of variability produces also an asymmetric outflow of matter, reversing its direction as time goes on. We present different cases, exploring the parameter space, obtained with different numerical tecniques, i.e. with S.P.H. and TVD codes. The many ways a shock can oscillate offer a wide choice of mechanisms to explain Quasi Periodic Oscillations in black hole candidates.
Fauci Francesco
Gerardi G.
Molteni Diego
Valenza M. A.
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