On the Zeeman effect in magnetically arrested disks

Magnetically arrested disk (MAD) has been argued as the key accretion phase to realize formation of relativistic jets. However, due lack magnetic field measurements accreting systems, MAD not observationally confirmed yet. Here we propose that a strong accompanied by would induce Zeeman splitting relativistically broadened Fe K$\alpha$ fluorescence lines in X-ray binaries and active galactic nuclei, where consider two-phase medium inner disk, magnetically dominated hot corona cold reflector. Such geometrical configuration is suggested from observations recently numerical simulations. Although turbulence flows broaden split lines, future high-energy resolution satellites, XRISM Athena, be capable seeing effect on case with configuration. The signature provide observational evidence for MAD.