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What are the theories that explain the jets that occur at opposite ends of the accretion disk of a black hole?
In artistic depictions it shows these jets occur within the event horizon? What is the makup of these jets. They appear to look like ionized gas?
Relativistic, or extragalactic, jets are extremely powerful jets of plasma which emerge from the centers of some active galaxies, notably radio galaxies and quasars. A jet is created from subatomic particles and magnetic fields in the accretion disk of the supermassive black hole in the nucleus of an active galaxy. It is believed that the twisting of magnetic fields in the accretion disk collimates the outflow along the rotation axis of the black hole, so when conditions are suitable, a jet will emerge from each face of the accretion disk. If the jet is oriented along the line of sight to earth, relativistic beaming will change its apparent brightness.
Observations of jets with the Swift spacecraft determined that the jets, which have long been known to be electrically neutral, are formed of electrons and protons. The jets also carry much more energy than was originally believed. Measures of X-rays peaked at 10,000 electronvolts. The jets are calculated to move at 99.9% of the speed of light and carry as much mass as the planet Jupiter.[1]
Similar jets, though on a much smaller scale, can develop around the accretion disks of neutron stars and stellar black holes. These systems are often called microquasars. A famous example is SS433, whose well-observed jet has a velocity of 0.23c, although other microquasars appear to have much higher (but less well measured) jet velocities. Even weaker and less-relativistic jets may be associated with many binary systems; the acceleration mechanism for these jets may be similar to the magnetic reconnection processes observed in the
Although a disk's magnetic field and rotation are believed responsible for the formation of the axial radiation jet, the observed jets are more tightly collimated than predicted by current theory.
--- from Wikipedia, http://en.wikipedia.org/wiki/Galactic_jets
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