Observations of a black hole X-ray binary indicate formation of a magnetically arrested disk

Autor: You, Bei, Cao, Xinwu, Yan, Zhen, Hameury, Jean-Marie, Czerny, Bozena, Wu, Yue, Xia, Tianyu, Sikora, Marek, Zhang, Shuang-Nan, Du, Pu, Zycki, Piotr T.
Rok vydání: 2023
Předmět:
Zdroj: Science 381, 961-964 (2023)
Druh dokumentu: Working Paper
DOI: 10.1126/science.abo4504
Popis: Accretion of material onto a black hole drags any magnetic fields present inwards, increasing their strength. Theory predicts that sufficiently strong magnetic fields can halt the accretion flow, producing a magnetically arrested disk (MAD). We analyze archival multi-wavelength observations of an outburst from the black hole X-ray binary MAXI J1820+070 in 2018. The radio and optical fluxes are delayed by about 8 and 17 days respectively, compared to the X-ray flux. We interpret this as evidence for the formation of a MAD. In this scenario, the magnetic field is amplified by an expanding corona, forming a MAD around the time of the radio peak. The optical delay is then due to thermal viscous instability in the outer disk.
Comment: The author's version of the article which will appear in Science on 31 August 2023, 49 pages including the extended data. The online publication version can be found at https://doi.org/10.1126/science.abo4504
Databáze: arXiv
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