Speaker
Mr
Alessandro Ballone
(USM/MPE, Garching)
Description
A. Ballone, M. Schartmann, A. Burkert, S. Gillessen, R. Genzel, T.K.
Fritz, F. Eisenhauer, O Pfuhl, T. Ott
The origin of the dense gas cloud "G2" discovered in the Galactic Center
(Gillessen et al. 2012) is still a debated puzzle.
G2 might be a diffuse cloud or the result of an outflow from an invisible
star embedded in it. I will present the first attempt of detailed
simulations of the evolution of winds on G2's orbit, including both the
hydrodynamic interaction with the hot atmosphere present in the Galactic
Center and the extreme gravitational field of the supermassive black hole:
we find that both must be taken in account when modelling such a source
scenario. We also find that in this scenario most of the Brγ luminosity is
expected to come from the densest part of the wind, which has a highly
filamentary structure with low filling factor.
For our assumptions, the observations can be best matched by a mass
outflow rate of dMw/dt = 8.8 × 10^(-8) Msol/yr and a wind velocity of vw =
50 km/s. These values are compatible with those of a young TTauri star
wind, as already suggested by Scoville & Burkert (2013).