0000000000466561

AUTHOR

K. Acharya

showing 2 related works from this author

Bending Instability of an Accretion Disc Around a Black Hole

2001

We demonstrate that generically an accretion disk around a compact object could have a new type of instability in that the accretion flow need not be symmetric with respect to the equatorial plane even when matter is supplied symmetrically farther out. We find that this behaviour is mainly due to interaction of outgoing matter bounced off the centrifugal barrier and the incoming accretion. We believe that X-ray variability could be developed by this instability.

Shock wavePhysicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsCompact starAstrophysicsInstabilityAccretion (astrophysics)Accretion discSpace and Planetary ScienceAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy Astrophysics
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Interaction of accretion shocks with winds

2002

Accretion shocks are known to oscillate in presence of cooling processes in the disk. This oscillation may also cause quasi-periodic oscillations of black holes. In the presence of strong winds, these shocks have oscillations in vertical direction as well. We show examples of shock oscillations under the influence of both the effects. When the shocks are absent and the flow is cooler, the wind becomes weaker and the vertical oscillation becomes negligible.

Shock wavePhysicsSpace and Planetary ScienceOscillationAstrophysics::High Energy Astrophysical PhenomenaVertical directionAstrophysics::Solar and Stellar AstrophysicsAstronomy and AstrophysicsAstrophysicsAstrophysics::Galaxy AstrophysicsAccretion (astrophysics)Journal of Astrophysics and Astronomy
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