Formation of discs around super-massive black hole binaries
TL;DR: In this paper, the evolution of turbulent molecular clouds in near-radial infall onto equal-mass super-massive black hole binaries was modeled numerically using a modified version of the GADGET-3 code, and different gas structures formed depending on the relative inclination between the binary and the cloud orbits were investigated.
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Abstract: We model numerically the evolution of $10^4M_\odot$ turbulent molecular clouds in near-radial infall onto $10^6M_\odot$, equal-mass super-massive black hole binaries, using a modified version of the SPH code GADGET-3 We investigate the different gas structures formed depending on the relative inclination between the binary and the cloud orbits Our first results indicate that an aligned orbit produces mini-discs around each black hole, almost aligned with the binary; a perpendicular orbit produces misaligned mini-discs; and a counter-aligned orbit produces a circumbinary, counter-rotating ring
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References
The Cosmological simulation code GADGET-2
TL;DR: GADGET-2 as mentioned in this paper is a massively parallel tree-SPH code, capable of following a collisionless fluid with the N-body method, and an ideal gas by means of smoothed particle hydrodynamics.
Massive black hole binaries in active galactic nuclei
TL;DR: In this article, the authors explore the possibility that some active galactic nuclei may contain two massive black holes in orbit about each other, which suggests a new interpretation for the observed bending and apparent precession of radio jets emerging from these objects.
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SPLASH: An interactive visualisation tool for smoothed particle hydrodynamics simulations
TL;DR: Splash as mentioned in this paper is a publicly available interactive visualisation tool for Smoothed Particle Hydrodynamics (SPH) simulations, which provides the user with a fast, interactive and meaningful visualisation of one, two and three dimensional SPH results.
Evolution of massive binary black holes
TL;DR: In this article, the authors studied the evolution of massive binary black holes (BBHs) in realistic galaxy models, using a generalization of techniques used to study tidal disruption rates around massive BHs.
Massive black hole binary mergers within subparsec scale gas discs
Jorge Cuadra,Philip J. Armitage,Philip J. Armitage,Richard Alexander,Richard Alexander,Mitchell C. Begelman,Mitchell C. Begelman +6 more
TL;DR: In this article, the authors investigate the evolution of the semi-major axis and eccentricity of binary stars embedded within geometrically thin gas discs, and show that the binary decays at a rate which is in good agreement with analytical estimates, while the eccentricity grows.
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