Effects of the composition on transonic properties of accretion flows around black holes

Abstract

We study the properties of a steady, multi-species, low angular momentum accretion flow around a Schwarzschild black hole. Each species is described by a relativistic equation of state. We find that the transonic properties depend strongly on the composition of the flow. We find that an electron-positron pair plasma is the least relativistic one. This flow produces only one sonic point very close to the event horizon and does not show multiple critical points for any angular momentum or energy. When the baryons are present, the number of critical points depend on the specific energy content. Since the number of critical points decide whether the flow will have non-linearities or shock waves, our results implies that whether or not standing shocks forms will depend on the flow composition. Thus, for instance, a pure electron-positron pair plasma will never undergo a shock transition, while mixing it with some baryons (common in outflows and jets, for example) as in a completely ionized gas, will have shocks. We study in detail how the baryon loading affects the shock properties and discuss implication in astrophysical observations.

21 pages,8 figures, published in IJMPD in 2011

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• Spectrum of two component flows around a super-massive black hole: an application to M87
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• Standing Shocks in Magnetized Dissipative Accretion Flow around Black Holes
• Radiatively driven general relativistic jets
• Binary black holes in magnetized AGN disks
• Effect of magnetic flux advection on the dynamics of shock in accretion flow around a rotating black hole