http://arxiv.org/abs/1401.6456
The observed population of “S-stars” within a distance of 1″ from SgrA* contradicts our understanding of star formation, due to the forbiddingly violent environment. A suggested possibility is that these stars form far and have been brought by some fast dynamical process, since they are young. Nonetheless, all conjuctured mechanisms either fail to reproduce their eccentricities -without resorting to extra ingredients, which render the models more complicated- or cannot explain the problem of “inverse mass segregation” at the Galactic Center (GC): The fact that lighter stars are closer to the center (the S-stars) and more massive ones, Wolf-Rayet (WR) and O-stars, farther out. In this Letter we put forward the idea that the responsible for both, the distribution of the eccentricities and the paucity of massive stars, is an induced Kozai-Lidov-like resonance exerted by the observed disk on the stars populating the innermost 1″ region, considering that the disk probably extended to smaller radius in the past.
Tue, 28 Jan 14
52/73
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