A galaxy whose brightness suddenly begins to change inevitably catches the eye of scientists. A true explosion of visible light. And even ultraviolet. Then a mysterious disappearance of the emissions of certain X-rays Before a return to normal. Enough to tie knots in the researchers’ brains. But astronomers now provide an explanation. The person in charge would be sought on the side of the supermassive black hole at the center of this galaxy and its magnetic field.
Many times in history havevise versa. The last time was about 780,000 years ago. The magnetic field of , it turns much more regularly. Every 11 years. But what think they have observed that this time is of a completely different dimension. Neither more nor less than the reversal of the magnetic field surrounding a supermassive black hole. All about 236 million light-years from ours .
The warning was given in March 2018, then All-Sky Automated Survey for Supernovae reported thatnamed 1ES 1927 + 654 seemed almost 100 times brighter than it should. in the realm of the visible. That then went in search of previous data that would help date the change of . They went back to the end of 2017.
The researchers then turnedagainst this strange galaxy. In May 2018, he reported that the ultraviolet (UV) emission of 1ES 1927 + 654 had increased twelve times. But that she shrank. A few weeks later, in June, the broadcast of of higher energy simply disappeared.
NASA’s Swift detects potential magnetic flip of monster black hole
A rare and enigmatic eruption from a galaxy 236 million light-years away may have been triggered by a magnetic reversal, a spontaneous reversal of the magnetic field around its central black hole.
—Mohamed Rady (@mrfreewill) May 9, 2022
For supermassive black holes as for the Sun or Earth
Astronomers at first thought they had surprised onebeing consumed by which is located in the heart of 1ES 1927 + 654. Let’s remember when falls against a black hole that sometimes weighs billions – here a priori twenty million – times of our Sun, it begins to gather in one . When it swirls inward, it emits visible, UV and low energy X-rays. Closer to the black hole, the extremely hot material that forms the corona emits X-rays with higher energy. All with an intensity that depends on the amount of substance that falls on the supermassive black hole. The problem is that the phenomenon should have disappeared much faster than what scientists observed on this galaxy.
And the fact that the X-rays disappeared for a moment put them on a completely different track. That with a magnetic field reversal. What astronomers actually believe is that the magnetic field in a supermassive black hole creates and maintains its corona. Any change in this field will thus result in observable changes inof high energy.
According to the model developed by the researchers, said magnetic field in case of a magnetic field inversion will start to weaken in the periphery of the accretion disk, leading to heating and therefore an increase in emissions in the visible and in UVs. As the inversion progressed, the magnetic field would eventually weaken so much that it could no longer maintain the corona. The high energy X emission would disappear. So when the reverse field would start regaining strength, those emissions would resume. This is what astronomers observed in October 2018. And by the summer of 2021, the galaxy had completely returned to its previous state.