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This work proposes a methodology to test phenomenologically-motivatedemission processes that account for the flux and polarization distribution andglobal structure of the 230 GHz sources imaged by the Event Horizon Telescope(EHT): Messier (M)87* and Sagittarius (Sgr) A*. We introduce to generalrelativistic magnetohydrodynamic (GRMHD) simulations some novel models tobridge the largely uncertain mechanisms by which high-energy particles injet/accretion flow/black hole (JAB) system plasmas attain billion degreetemperatures and emit synchrotron radiation. The "Observing" JAB Systemsmethodology then partitions the simulation to apply different parametric modelsto regions governed by different plasma physics -- an advance over methodswhere one parametrization is used over simulation regions spanning thousands ofgravitational radii from the central supermassive black hole. We presentseveral classes of viewing-angle dependent morphologies, and highlightsignatures of piecewise modeling and positron effects -- including a MAD/SANEdichotomy in which polarized maps appear dominated by intrinsic polarization inthe MAD case and by Faraday effects in the SANE case. The library of imagesthus produced spans a wide range of morphologies awaiting discovery by thegroundbreaking EHT instrument and its yet more sensitive, higher resolutionnext-generation counterpart ngEHT.

Emission Modeling in the EHT-ngEHT Age