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

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arxiv 2309.00200 v3 pith:HWTRM5UI submitted 2023-09-01 astro-ph.HE

Bei You , Xinwu Cao , Zhen Yan , Jean-Marie Hameury , Bozena Czerny , Yue Wu , Tianyu Xia , Marek Sikora
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Shuang-Nan Zhang Pu Du Piotr T. Zycki
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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.

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Cited by 4 Pith papers

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  1. Construction of an analytic multi-component accretion environment and its application to Kerr black hole imaging

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  3. Thermodynamics of Kerr-Bertotti-Robinson black hole

    gr-qc 2026-03 conditional novelty 5.0 of 10

    A consistent thermodynamics of the Kerr-Bertotti-Robinson black hole is constructed by adopting the Christodoulou-Ruffini mass relation, yielding a first law and Smarr formula without an explicit magnetic-field work term.

  4. Science objectives of the Einstein Probe mission

    astro-ph.HE 2025-01 unverdicted novelty 2.0 of 10

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