Fluctuating light from a black hole, observed over 15 years, has revealed more about the way these enigmatic objects feed.
First, a structure called a corona forms around the outside of the event horizon. Then, powerful jets of plasma launch from the poles, punching material from the corona out into interstellar space at speeds close to that of light in a vacuum."It sounds logical, but there has been a debate for twenty years about whether the corona and the jet were simply the same thing,""Now we see that they arise one after the other and that the jet follows from the corona.
It's the same thing we see on a larger scale in quasars, which are galactic nuclei that contain an active supermassive black hole millions to billions of times the mass of the Sun.The black hole GRS 1915+105 is just 12 times the mass of the Sun, hence microquasar; even so, it's the one of the most massive stellar massThis process generates a lot of light from the heating of the disk and the complicated environment around the black hole.
This is what scientists think, anyway. The space around black holes is so extreme that it's difficult to get a handle on the processes that take place. This suggests that energy that powers the microquasar system can be directed either to the X-ray corona, or the relativistic jet. Added to models of the fluctuations in light from the system, the researchers concluded that, at least in GRS 1915+105, it seems that the corona turns into the jet.."We had to compare data of years with that of seconds, and of very high energies with very low ones.
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