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Constraining the nature of the Galactic center black hole Sgr A* with present and future observations
F. H. Vincent, E. Gourgoulhon, O. Straub +4
The Galactic center is an ideal laboratory to study strong-field general relativistic phenomena, as the supermassive black hole Sgr A* has the biggest angular Schwarzschild radius…
The effect of advection at luminosities close to Eddington: The ULX in M31
Odele Straub, Chris Done, Matthew J. Middleton
The transient, ultra-luminous X-ray source CXOM31 J004253.1+411422 in the Andromeda galaxy is most likely a 10 solar mass black hole, with super-Eddington luminosity at its peak. T…
Modelling the black hole silhouette in Sgr A* with ion tori
Odele Straub, Frederic H. Vincent, Marek A. Abramowicz +2
We calculate the "observed at infinity" image and spectrum of the accretion structure in Sgr A*, by modelling it as an optically thin, constant angular momentum ion torus in hydrod…
Alpha-viscosity effects in slender tori
Jiri Horak, Marek Abramowicz, Lina Levin +2
We explore effects of the Shakura-Sunyaev alpha-viscosity on the dynamics and oscillations of slender tori. We start with a slow secular evolution of the torus. We show that the an…