Constraining the Black Hole Parameters and the Accretion Flow in Sagittarius A* by GR Dynamical and Radiative Modeling

Details Constraining the Black Hole Parameters and the Accretion Flow in Sagittarius A* by GR Dynamical and Radiative Modeling Constraining the Black Hole Parameters and the Accretion Flow in Sagittarius A* by GR Dynamical and Radiative Modeling

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341107s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #411.07; Bulletin of the American Astronomical Society, Vol. 41, p.217

Astronomy and Astrophysics

Astronomy

Scientific paper

I perform the ray-tracing calculations in Kerr metric of the transfer of X-Ray and polarized cyclo-synchrotron radiation through the accretion flow in Sagittarius A*. The accurate formulas are used for Faraday rotation, Faraday conversion, emission, and absorption coefficients in thermal and non-thermal plasmas. The flow pattern and the magnetic field geometry are taken to comply with the recent 3D GRMHD simulations. Various prescriptions for electron heating rate by turbulence are explored. Based on the analysis of quiescent and flaring Sgr A* spectra, the constraints on the black hole spin and axis orientation are provided. Some freedom in dynamical modeling is eliminated with the ultimate goal of building a model without the ad-hoc parameters. The work is funded in part by NASA Earth and Space Science Fellowship.

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