Top image is compliments of scitechdaily.com and lower image is compliments of Phys.org.
Super Massive Black Holes exist at the center of every galaxy. Their gravitational distortion of space is so large that everything in a galaxy revolves around them. Some super massive black holes are more active than others. Some produce enormous jets of x-rays, and some produce jets of super heated gas.
The top image above shows the anatomy of a super massive black hole jet. See how the gas is super heated to a plasma and is ejected from the event horizon following the lines of a magnetic field.
A simplified explanation for these jets is that material entering the black hole becomes "jammed up" at the entry point, the event horizon. As the material is drawn into the black hole it interacts more severely, super-heating it to a plasma and this interaction can create enormous jets of gas and sometimes x-rays. A colourized image of actual supermassive blackhole with jets is shown in the lower image above.
A black hole can also suck the mass of a star which gets too close creating an accreation disk of material surrounding the black hole and then creating an enormous jet from the center, emitting super-heated gas in the form of plasma. Although the top image is an animated reproduction, it accurately depicts what astronomers have actually seen occurring in space.
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