BH2 - Theoretical and observational studies of astrophysical black holes |
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Speaker |
Falcke, Heino |
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Coauthors |
Davelaar, Jordy |
| Talk Title |
Modeling Accelerated Particle Emission In SgrA* |
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Abstract |
The Event Horizon Telescope aims to image the shadow of the supermassive black hole Sagittarius A* for the very first time. In order for us to interpret its observations, we need a realistic model that connects the microphysics of the plasma processes to observable source characteristics, such as source size and spectral energy distribution (SED). Recent models of SgrA* are based on GRMHD simulations that describe the dynamics of the flow combined with ray tracing simulations that calculate the SED. One of the free parameters of these models is the distribution function of the radiatively important electron population, which can heavily influence the shape of the SED. In the past, it was often assumed that the source of the emission is a thermal electron population. We recently extended these models to include an accelerated electron population by using a kappa-distribution function. We showed that our new model is capable of recovering the observable source characteristics of SgrA*. We concluded that for the quiescent state of SgrA* accelerated electrons are not of vital importance, but in the case of NIR flare emission the presence of accelerated particles is necessary. Our model can recover the observed spectral shape at NIR frequencies when five percent of the electrons is accelerated inside the highly magnetized jet region. |
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