MG14 - Talk detail

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 Participant

Institution

Session

Accepted

Yes

Order

Time

Talk

Title

Abstract

The inner region of the transient sources is cooled down by the inverse Compton effect of the soft photons from the Keplerian disk, bounds the shock location to move inwards to satisfy the Rankine-Hugoniot shock condition. We consider few transient sources to study this movement of the shock. The presence of cooling changes the geometry of the Compton cloud drastically. We also see that how the parameter space of these sources changes day by day at the time of outbursts. As the shock is the crucial factor for the origin of QPOs, from our hydrodynamic solution we want to resolve the question: is QPOs originated from the propagation of shock? For that we solve the Rankine-Hugoniot conditions and derive the condition of shock formation in presence of Compton cooling. We also compute the inward velocity of the Compton cloud to be a few meters per second, which satisfies the earlier observational results.

Pdf file

Session

Accepted

Yes

Order

Time

Talk

Title

Abstract

Matters enter into the potential well formed by the compact objects due to the transport of angular momentum by viscosity. We compute the amount of viscosity during the outburst time of the transient sources. In the progressive days as the viscosity increases inner edge of the Keplerian disk moves closer to the black holes. Thus the size of the Compton cloud reduces and the frequency of the Quasi Periodic Oscillations increases. We also compute the Compton cooling day by day, which is responsible for the movement of the shock both in rising and declining phases of the outburst. Our viscosity value rises/decays monotonically during the rising/declining phases of the outburst, well within the range proposed by magnetorotational instability. For that we solve the Rankine-Hugoniot conditions and derive the condition of shock formation in presence of Compton cooling.

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