Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21730301d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #303.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Ongoing high resolution observations of the Galactic center black hole provide a direct probe of the structure of its accretion flow (Sgr A*) on event-horizon scales. Due to its low luminosity, this source is uniquely suitable for modeling with relativistic MHD simulations. We perform time-dependent, relativistic radiative transfer on 3D simulation data to compute images and light curves of Sgr A* at millimeter wavelengths. Fitting the images to observations allows us to constrain the parameters of the accretion flow and black hole. Simulations with misaligned angular momentum and black hole spin axes ("tilted") are also considered. Due to the precession of these accretion flows, the inferred best fit parameters should appear to change on week timescales if Sgr A* is tilted. Light curves from all simulations exhibit flaring behavior consistent with the observations. The black hole shadow, a signature of the event horizon, is visible in all best fit models and may be detected in the next 5-10 years. Preliminary results from similar models of M87 are also discussed.
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