時間：2019-09-29 13:23:28 來源：寓教于樂 瀏覽：28 次
Speaking of the most powerful and mysterious black hole in the universe, what kind of image will appear in your mind? In general movies and popular science works, it is often like this: the huge accretion disk revolves around the black hole, the two ends are high-speed jet flow, all cosmic matter and even light are mercilessly inhaled.
Earlier, many observatories around the world published the first black hole photographs taken by humans at the same time, and NASA (NASA) with a rigorous scientific attitude, drew a clear black hole appearance, a distorted, magnificent world. This black hole image is very close to the Kagantuya black hole in the movie Star Crossing. Although it is very vague, we finally "see" the black hole.
This is a system consisting of a black hole body, light, accretion disk and so on. The black part in the middle is not a black hole, but only the shadow of a black hole, which is about twice the horizon.
A thin circle of light outside it is called the photon circle, which is a "halo" formed by multiple distortions of the accretion disk image. The light in it is often distorted twice, three or more times by the black hole before it can be seen by the outside world, and becomes darker and weaker because it is too close to the black hole.
The whole outside revolves around the black hole, which is a huge accretion disk. The hot, thin layer consists of various materials and gases which rotate at high speed and fall slowly to the black hole. It becomes very bright because of strong collision and radiation. The accretion disk is a normal disk shape, but because the light near the black hole is highly distorted, the accretion disk we see becomes what we see in the picture.
The upper part is actually the far end of the accretion disk, and the lower part is the bottom of the far end of the accretion disk. The gravitational field of the black hole distorts the path of light propagation, which belongs to the lens effect.
The image on the left side of the accretion disk is much brighter than that on the right side, because it is assumed that the accretion disk rotates counterclockwise and that the material on the left side moves at a high speed in the direction of the observer. It becomes bright due to the Doppler effect and dim on the right side.