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Relativistic Jets from Magnetically-Arrested Prograde Black Hole Accretion

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Uploaded on Jan 19, 2012

Movie of jets from a magnetically arrested accretion flow onto a prograde black hole, with dimensionless spin a = 0.9 (fiducial model A0.9f from http://arxiv.org/abs/1201.4385). This produces about 3 times more powerful jets than a retrograde black hole, with spin a = -0.9 (see http://www.youtube.com/watch?v=yNZLjs... for movie).

The top left panel shows a vertical, x-z, slice through the simulation, and the top right panel shows the horizontal, x-y, slice. Colour shows the logarithm of fluid frame gas density (blue shows low and red high values, see colour bar). The black hole is shown with the black circle and has a dimensionless spin parameter, a = 0.9. Solid lines show field lines in the image plane (the thicker the lines, the stronger the field). The bottom 3 panels show, from top to bottom: mass accretion rate, dimensionless black hole magnetic flux, and energy outflow efficiency.

After the start of the simulation, turbulence develops inside the disc (via the action of magnetorotational instability, MRI) and causes gas and magnetic field to accrete onto the black hole. Gas reaches the hole at t ~ 2000 time units, and the accretion rate saturates at t ~ 5000 time units. Magnetic flux grows until t ~ 6000 units, beyond which it saturates. After this time, the accretion is magnetically arrested: despite accretion brings even more flux, there is no more room for it on the hole, and the excess flux remains outside and obstructs the accretion. From time to time, some of the black hole flux gets pushed off the hole into the disc. This frees room for some of the incoming flux to accrete on the hole. In this magnetically-arrested state, all quantities oscillate around their mean values, and the flow generates energy in the form of jets with an average efficiency, eta ~ 100%. This means that for every unit of energy eaten by the black hole, the same amount of energy is carried away by polar jets.

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