Astronomers detect for the first time a flash of a black hole mysteriously igniting .. image


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Astronomers detect for the first time a flash of a black hole that mysteriously ignites .. Picture, Today, Friday, July 17, 2020 3:53 pm

Astronomers observed “for the first time” that the flash mysteriously ignited before gradually returning to brightness … as the massive black hole supports the nucleus of a galaxy 275 million light-years away, called 1ES 1927 + 654.

For only 40 days, astronomers witnessed a huge drop in its glowy wreath, before it became brighter than before.

Physicist Irene Kara of the Massachusetts Institute of Technology (MIT) said: “We expect brightness changes of this magnitude to vary with time scales from several thousand to millions of years. But in this object, we have seen that it changes by 10,000 catalysts throughout the year, which is Something unheard of before. ”

There are many components in the area around a black hole, next to the event horizon. This is the famous “point of no return”, which even the speed of light is not enough to achieve escape … The active black hole also contains a huge disc of material that revolves around it, such as the water that circulates around a drain.

Close to the event horizon of an active black hole, around the inner edge of the growth disk, is the corona, a region of hot burning electrons, believed to work by the magnetic field of a black hole, which acts like a synchrotron to accelerate electrons to high energies, so much that they glow brightly in X-ray wavelengths.

Astronomers first noticed a strange occurrence in 1ES 1927 + 654 in 2018, when an ASASSN robotic survey looking for bright flashes of light across the entire sky – discovered an incredibly bright glow from the galaxy, almost 40 times its natural brightness.

This attracted the attention of astronomers, as they directed a group of telescopes toward the galaxy to learn more. For a while, everything was normal – but then about 160 days after the flare, the nucleus of 1ES 1927 + 654 began to darken. Over a period of 40 days, the X-ray glow was completely eliminated.

“After ASSASN saw it was going through this huge crazy frenzy, we saw the disappearance of the aura that had become undetectable,” Kara said.

But then the brightness started to appear steadily again. 300 days after the initial flare, the nucleus of the galaxy was 20 times brighter than it was before the initial event.

Astrophysicist Claudio Ricci, of the University of Diego Portales in Chile and lead author of the study, said: “We don’t usually see such differences in the accumulation of black holes. It was so strange that we initially thought there was a data error. Very exciting, but we also had no idea what we were dealing with. ”

Astronomers have made it clear that they are not quite sure how to generate and support the black hole aura. But if, presumably, it has something to do with the magnetic fields of the black hole, the dramatic changes observed in 1ES 1927 + 654, could be the result of something disrupting those magnetic fields.

We know that black holes can change very quickly, when you pick up and eat up a star that comes close to it a little. The star is torn apart in a process called tidal disturbance, and it unleashes a glow of bright light, before being blurred out of the event’s horizon to counter its mysterious fate.

If a fleeing star encounters the black hole of 1ES 1927 + 654, the events may be proportional to the observed changes in X-ray radiation. First, the star is unexpectedly disrupted, causing the initial glow. After that, debris from the star can temporarily disable the magnetic field of the black hole.

This can be an important guide to understanding the radius, which is controlled by the magnetic field within the aura of the black hole.

And if the star was responsible for the event, the team calculated that the tidal disturbance should have occurred within 4 light minutes from the center of the black hole, that is, about half the distance between the Earth and the sun. But there may be another reason to display light.

We know that the black hole aura can vary in brightness, although it generally occurs over longer time periods. It is possible that the extreme behavior observed in 1ES 1927 + 654, is also very normal – we have not yet discovered it.


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