For the first time, a global team of scientists has uncovered the magnetic field transport processes in the accretion flow of a black hole, as well as the creation of a magnetically arrested disk, or 'MAD,' near the black hole. This breakthrough came from multi-wavelength observations of an outbu
An illustration of the black hole X-ray binary MAXI J1820+070 with a magnetically arrested disk formed around the black hole. Credit: You Bei
Key to their discovery was the observation that the radio emission from the black hole jet and the optical emission from the outer region of the accretion flow lags behind the hard X-rays from the hot gas in the inner region of the accretion flow by about eight days and 17 days, respectively.The study was led by Assoc. Prof. You Bei from Wuhan University, Prof. Cao Xinwu from Zhejiang University, and Prof. Yan Zhen from the Shanghai Astronomical Observatory of the Chinese Academy of Sciences.
In this study, the researchers performed a multi-wavelength data analysis of the outburst of the black hole X-ray binary MAXI J1820+070. They observed that the hard X-ray emission exhibited a peak that was followed by a peak in radio emission eight days later. Such a long delay between radio emission from the jet and the hard X-rays from the hot accretion flow is unprecedented.
Additionally, the research team observed an unprecedented delay between the optical emission from the outer region of the accretion flow and the hard X-rays from the hot accretion flow. Through numerical simulations of the outburst of the black hole X-ray binary, it was discovered that as the outburst approaches the end, the irradiation of hard X-rays causes more accreting material from the far outer region to fall toward the black hole due to instability.
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