Faraday rotation in GRMHD simulations of the jet launching zone of M87

Understand

Non-VLBI measurements of Faraday rotation at mm wavelengths have been used to constrain mass accretion rates ($\mdot$) onto supermassive black holes in the centre of the Milky Way and in the centre of M87.

• We constructed general relativistic magnetohydrodynamics models for these sources that qualitatively well describe their spectra and radio/mm images invoking a coupled jet-disk system.
• Using general relativistic polarized radiative transfer, we now also model the observed mm rotation measure (RM) of M87.
• The models are tied to the observed radio flux, however, electron temperature and accretion rate are degenerate parameters and are allowed to vary.