9/12/2023 0 Comments Event horizon telescope paper![]() The consistent GRMHD models are all of magnetically arrested accretion disks, where near-horizon magnetic fields are dynamically important. In a quantitative comparison with a large library of simulated polarimetric images from general relativistic magnetohydrodynamic (GRMHD) simulations, we identify a subset of physical models that can explain critical features of the polarimetric EHT observations while producing a relativistic jet of sufficient power. ![]() We show that the net azimuthal linear polarization pattern may result from organized, poloidal magnetic fields in the emission region. We estimate the average density n e ∼ 10 4-7 cm -3, magnetic field strength B ∼ 1-30 G, and electron temperature T e ∼ (1-12) × 10 10 K of the radiating plasma in a simple one-zone emission model. The low fractional linear polarization in the resolved image suggests that the polarization is scrambled on scales smaller than the EHT beam, which we attribute to Faraday rotation internal to the emission region. ![]() Here we compare the resolved polarization structure observed by the EHT, along with simultaneous unresolved observations with the Atacama Large Millimeter/submillimeter Array, to expectations from theoretical models. This polarized synchrotron radiation probes the structure of magnetic fields and the plasma properties near the black hole. Event Horizon Telescope (EHT) observations at 230 GHz have now imaged polarized emission around the supermassive black hole in M87 on event-horizon scales.
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