The jets of giant black holes are caused by radiation and magnetic fields
All radiation that seems to come out from black holes is coming from material that black hole pulls inside it. The friction inside the disk of the material, what is falling in a black hole is causing extreme heat and nuclear reaction, which is very powerful. When black holes are pulling material in it, that material will turn to disk around the singularity because of the extremely high speed.
The friction in the disk is the reason for the differences in the speed of material inside that disk, and because inner layers of the disk are orbiting the black hole faster than outer, the temperature is rising to an extremely high level, what means there are powerful nuclear reactions in that disk. And the result of those nuclear reactions is the X- and gamma rays, which are uncovering the black holes. The GRB (Gamma Ray Bursts) could be a result of the case that some larger or denser objects would pull in a black hole.
So are GRBs the cases, where the black hole, what is in the empty area of the universe impacts with the neutron star or other black holes. That thing could explain why GRBs are so sudden and high-energetic.
Black holes are sending radiation only if they are pulling gas inside them. The powerful magnetic field along with powerful radiation would push the gas away from the black hole near its poles. So the phenomenon is similar to neutron stars. And as I just wrote the black hole itself doesn't send any kind of radiation itself. The radiation comes from the disk around the black hole.
But if the black hole is in an empty bubble in the universe, that means it is very hard to detect even its supermassive. Sooner or later the supermassive black holes are pulling entire galaxies inside them and in that process in the universe is forming the absolute empty area. And if the black hole is in that area, it is invisible and so-called sleeping black holes can be the source of GRBs. If two sleeping black holes are suddenly impacting, that causes a gamma-ray burst.
So the thing that supports the theory that GRB s are forming because of the impacting two black holes is that those high-energetic bursts are so sudden and hard to predict. If the black hole will be in the middle of the molecular nebula it will send the X- and gamma-rays all the time. But if the space is empty, that object sends that radiation only when it impacts with other black hole or neutron star. The neutron star is sending radiation only if there is material, what it can pull to it.
The black holes are like neutron stars, and they can pull entire stars and interplanetary nebulas inside them. And black holes are also impacting. So the massive objects like neutron stars and black holes can hover the gas and other molecules from some areas. And if the black holes are impacting in the empty bubble in the universe, that causes an extremely powerful flash of gamma-ray.
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