Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-12-11
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
2 pages, 2 figures; to be published in "The Galactic Center: a Window to the Nuclear Activity of Disk Galaxies", ed. Mark Morr
Scientific paper
We present the combination of dynamical accretion model based on 3D GRMHD simulations and general relativistic (GR) polarized radiative transfer. We write down the formalism of and perform the GR ray-tracing of cyclo-synchrotron radiation through the model of accretion flow in Sagittarius A*. GR polarimetric imaging is presented as well as the results for spectrum for a probable set of spins and orientations. Precise fitting formulae for Faraday rotation and Faraday conversion coefficients are employed for thermal plasma. The axisymmetic flow pattern and the magnetic field geometry correspond to averaged 3D GRMHD simulations near the black hole, whereas the analytic model was used far from the black hole. The density scaling is found by fitting the sub-mm flux. Spin $a=0.7$ and inclination angle $\theta=0.6$ produce the best fit to sub-mm flux and linear polarization fraction.
Penna Robert F.
Shcherbakov Roman V.
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