The researchers of Stanford University have seen radiation which source is behind the black hole. Names and research are published in Nature magazine, and of course in the Stanford news. There is a link to that article published in Stanford news below this text.
The source of the X-ray bursts is seem to be just in front of the event horizon. The idea is that the particles that are just behind the event horizon can interact with particles just outside it. In some cases, the place of the event horizon is moving. And that uncovers the particles like photons just below it. During that process, photons are interacting with each other.
The place of the event horizon is extremely accurate because its the precise point, where escaping velocity is the same as the speed of light. So even the smallest anomaly in that point causes that photons are escaping to the universe. And that's why we can think that the event horizons thickness is about photon size.
The reason why the place of the event horizon is chancing is that the black holes are spinning. And the spin of the black hole is not stable, because the mass of material and radiation that drops in the black hole is not stable. So when more material is dropping to black hole the spin is increasing. And when the mass of radiation and material decreasing the spin is slowing causing minimal changes in the place of the event horizon. The photon-size movement has meaning in those cases.
The fact is that they are not seeing things, what are happening inside the event horizon. They are seeing the radiation released just at the point below the event horizon. The phrase nothing can escape from the black hole is not quite true. The place of the event horizon is sometimes moving, and that movement is not very big. That movement might not be larger than a photon.
But that extremely small movement causes that a couple of photons can escape from the black hole. The mass of the black hole expands so long that the mass of material that the black hole pulls in it is higher than what it loses. The black hole gets its energy from the transition disk around it. And the high energetic reactions inside that area is feeding the black hole.
The reason why radiation sometimes escapes from the black hole is the density of this object. The density of a black hole or its gravity field is so high, that even the photon-size change in the form of the event horizon causes that radiation can escape from the black hole. The warping or waving of the event horizon is extremely small. And it can be the size of a photon. But for escaping the wave movement or particles like the photon that is enough.
Another thing how black hole effects to the radiation is that object is acting like gravity lens. The black hole is chancing the trajectories of the photons. But it also curving the trajectories of all kinds of radiation like X-and gamma rays. The black hole is collecting the radiation that comes behind it, and if there is another X-ray object behind that black hole the gravity lens effect can cause that there is coming "too much radiation" from the black hole.
()https://news.stanford.edu/2021/07/28/first-detection-light-behind-black-hole/
Image:()https://news.stanford.edu/2021/07/28/first-detection-light-behind-black-hole/
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