Study suggests black hole jets get their power from spin
http://m.phys.org/news/2014-11-black...ets-power.html
And later that way!
Powerful jets from non-spinning black holes
http://m.phys.org/news/2015-11-power...ack-holes.html
"CfA astronomer Ramesh Narayan and his colleague have discovered an alternative explanation for the driving mechanism of the jets. Instead of rotation-powered, magnetically dominated jets, they find that non-spinning black holes can also drive powerful jets by means of the intense radiation emitted by hot gas. The gravity of the black hole attracts the radiation, which becomes concentrated enough that its pressure can drive the jet's particles at speeds up to about half the speed of light, at least under appropriate disk geometries.
Their result provides an alternative explanation for some puzzling astrophysical observations. Ultraluminous X-ray sources around the sky are thought to arise around black holes of about ten solar-masses in size, but the models can't explain the energetics of all of the observations unless the X-ray emission is emitted in narrow beams rather than isotropically. In the new alternative scenario, in which radiation drives the jets, the source naturally emits particles in narrow beams."
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rakkautta