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| Paper: |
Numerical Models of Sgr A* |
| Volume: |
439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies |
| Page: |
358 |
| Authors: |
Mościbrodzka, M.; Gammie, C. F.; Dolence, J.; Shiokawa, H.; Leung, P. K. |
| Abstract: |
We review results from general relativistic axisymmetric
magnetohydrodynamic simulations of accretion in Sgr A*. We use
general relativistic radiative transfer methods and to produce a broad band
(from millimeter to gamma-rays) spectrum. Using a ray tracing scheme we also
model images of Sgr A* and compare the size of image to the VLBI
observations at 230 GHz. We perform a parameter survey and study
radiative properties of the flow models for various black hole spins,
ion to electron temperature ratios, and inclinations. We scale our
models to reconstruct the flux and the spectral slope around 230 GHz.
The combination of Monte Carlo spectral energy distribution calculations
and 230 GHz image modeling constrains the parameter space of the
numerical models. Our models suggest rather high black hole spin
(a*≈ 0.9), electron temperatures close to the ion temperature
(Ti/Te∼3) and high inclination angles (i≈ 90°). |
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