Shulou(Shulou.com)11/24 Report--

Thank CTOnews.com netizens Cainiao N for the clue delivery! CTOnews.com, September 3 (Xinhua) the latest research by Chinese and foreign scientific cooperation teams has found direct observation evidence of the formation of magnetic trapping accretion disks around black holes, solving the mystery of how magnetic trapping disks were formed. The relevant results were published in Science on September 1.

The observation of ▲ black hole X-ray binaries reveals the formation process of magnetic trapping accretion disk. According to reports, this research result was jointly completed by Wuhan University, Zhejiang University, Shanghai Astronomical Observatory of Chinese Academy of Sciences, Institute of High Energy Physics of Chinese Academy of Sciences, Nanjing University, University of Science and Technology of China, Strasbourg Astronomical Observatory in France, Polish Center for theoretical Physics and other institutions. It uses the observation data of "discerning Eye", China's first space X-ray astronomical satellite, as well as the observation results of ground radio and optical telescopes.

Unlike the first photo of a black hole in human history (M87, 2019), there are also some "invisible" magnetic fields around the black hole, which can be detected indirectly by the accretion of gas.

To put it simply, the viscous process in the accretion flow can effectively release its gravitational potential energy and partially convert it into radiation energy, resulting in multi-band radiation observed by ground and space telescopes. (CTOnews.com Note: the physical process by which a black hole captures gas is called accretion, while the gas falling toward the black hole is called accretion flow, which is in the plasma state.)

▲ source: Wuhan University in the above picture, the red dot in the lower left box shows the approximate position of the black hole X-ray binary MAXI J1820070 in the Milky way, and the enlarged image on the right is the artistic imagination of the black hole X-ray binary: a star (blue) revolves around the black hole and its matter is attracted by the black hole to form an accretion disk (yellow). The central area forms a magnetic field trapping accretion disk (a light blue curve represents a magnetic field) and jets on both sides (bright purple). The upper left image shows the radio radiation of the observed jet and the X-ray in the accretion flow with time, showing an 8-day delay.

This picture clearly shows the multi-band light variation of the black hole X-ray binary MAXI J1820 070. Compared with the variation of X-ray radiation with time in the first picture (where the orange dot is the hard X-ray of the thermal accretion flow), this picture shows more of the variation of the radio radiation of the jet with time, and the peak value lags behind the hard X-ray by about 8 days.

In contrast, the following figure shows that the optical radiation outside the accretion disk varies with time, in which the orange dot is the peak of optical radiation after deducting the overall downward trend, which lags behind the hard X-ray for about 17 days.

The schematic diagram of the evolution of ▲ accretion flow, magnetic field and jet, according to official introduction, this research work reveals for the first time the process of magnetic field transport in black hole accretion flow and the complete process of the formation of magnetic trapping disk in thermal accretion flow near black hole, and has become the most direct observation evidence for the existence of magnetic trapping disk so far.

In addition, thanks to the universality of physical processes, the research results will greatly promote the understanding of key scientific issues such as the formation of large-scale magnetic fields and jet acceleration mechanisms in black hole accretion disks of different orders of magnitude.

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