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Accretion of material onto a black hole drags any magnetic fields presentinwards, increasing their strength. Theory predicts that sufficiently strongmagnetic fields can halt the accretion flow, producing a magnetically arresteddisk (MAD). We analyze archival multi-wavelength observations of an outburstfrom the black hole X-ray binary MAXI J1820+070 in 2018. The radio and opticalfluxes are delayed by about 8 and 17 days respectively, compared to the X-rayflux. We interpret this as evidence for the formation of a MAD. In thisscenario, the magnetic field is amplified by an expanding corona, forming a MADaround the time of the radio peak. The optical delay is then due to thermalviscous instability in the outer disk.

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