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Abstract: The Galactic centre hosts, according to observations, a number of early-typestars. About one half of those which are orbiting the central supermassiveblack hole on orbits with projected radii $\gtrsim$ 0.03 pc form a coherentlyrotating disc. Observations further reveal a massive gaseous torus and asignificant population of late-type stars. In this paper, we investigate, bymeans of numerical N-body computations, the orbital evolution of the stellardisc, which we consider to be initially thin. We include the gravitationalinfluence of both the torus and the late-type stars, as well as theself-gravity of the disc. Our results show that, for a significant set ofsystem parameters, the evolution of the disc leads, within the lifetime of theearly-type stars, to a configuration compatible with the observations. Inparticular, the disc naturally reaches a specific - perpendicular - orientationwith respect to the torus, which is indeed the configuration observed in theGalactic centre. We, therefore, suggest that all the early-type stars may havebeen born within a single gaseous disc.



Author: Jaroslav Haas, Ladislav Subr, Pavel Kroupa

Source: https://arxiv.org/







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