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Toward a model for HFQPOs in Microquasars
P. Varniere, M. Tagger, F. Vincent +1
There have been a long string of efforts to understand the source of the variability observed in microquasars but no model has yet gained wide acceptance, especially concerning the…
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…
3+1 geodesic equation and images in numerical spacetimes
Frederic H. Vincent, Eric Gourgoulhon, Jérôme Novak
The equations governing null and timelike geodesics are derived within the 3+1 formalism of general relativity. In addition to the particle's position, they encompass an evolution…
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…