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Effects of adiabatic index on the sonic surface and time variability of low angular momentum accretion flows

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arxiv 1905.02289 v1 pith:ILYTN3AU submitted 2019-05-06 astro-ph.HE

classification astro-ph.HE
keywords accretionadiabaticindexangularblackeffectsflowshole
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We study the role of adiabatic index in determining the critical points in the transonic low angular momentum accretion flow onto a black hole. We present the general relativistic 2D hydrodynamic simulations of axisymmetric, inviscid accretion flows in a fixed Kerr black hole gravitational field. A relativistic fluid where its bulk velocity is comparable to the speed of light, flowing in the accretion disk very close to the horizon can be described by an adiabatic index of 4/3 < {\gamma} < 5/3. The time dependent evolution of the shock position and respective effects on mass accretion rate and oscillation frequency with varying adiabatic index is discussed in the context of the observed microquasars.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Universal Radial Scaling of Large-Scale Black Hole Accretion for Magnetically Arrested And Rocking Accretion Disks

    astro-ph.HE 2025-05 conditional novelty 7.0 of 10

    Black hole accretion simulations show a universal inward mass flow scaling, about r^0.66 in magnetically arrested disks and r^0.87 in rocking accretion disks, with a repeating cycle that may set jet duty cycles.

  2. Novel methodology to obtain transonic solutions for dissipative flows around compact objects

    astro-ph.HE 2025-05 conditional novelty 6.0 of 10

    Global transonic accretion and wind solutions for black hole flows with dΩ/dr viscosity and cooling are obtained by integrating the stiff angular momentum equation implicitly and the other equations explicitly.

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