Odele StraubT.Paumard, F.Vincent, M.Abramowicz, E.Gourgoulhon30 min

Constraining the spin of Sgr A*

I will report on the multi-wavelength spectral fitting of Sgr A*: The accretion structure around the galactic supermassive black hole can be modelled by an optically thin, geometrically thick radiative inefficient flow, such as an ion torus. I will show the ray-traced images and model spectra of ion tori around Sgr A* (as seen by an observer on Earth). Fitting these to the observed spectrum (sub-mm to X-ray) allows to put further constraints on the black hole spin.