Speaker
Description
The observation of the M87* black hole shadow has opened new avenues for exploring horizon-scale phenomena around astrophysical black holes. Current black hole image modeling often relies on one-fluid general relativistic magnetohydrodynamic (GRMHD) simulations to model the black hole system, with subsequent post-processing with radiative transfer based on the simulated environments. However, while the plasma temperatures are simulated in GRMHD runs, the ratio between ion and electron temperature within the flow remains unknown. During post-processing, a common approach for estimating the ratio between ion and electron temperatures is by a parameterization according to the local plasma beta, which may not fully capture the underlying physics of electron heating and cooling in a self-consistent manner. To address this, we explore an alternative approach that estimates the electron temperature by considering the local energy balance of the electron, allowing for a more accurate determination based on the energy exchange of electrons. We present a comparison of the resulting electron temperatures and black hole images between the conventional parameterization and our new method, highlighting potential improvements in modeling horizon-scale emission.
| Participate the oral/poster presentation award competition | Yes |
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