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2009MNRAS.398..429L - Mon. Not. R. Astron. Soc., 398, 429-437 (2009/September-1)
Influence of a stellar cusp on the dynamics of young stellar discs and the origin of the S-stars in the Galactic centre.
LOCKMANN U., BAUMGARDT H. and KROUPA P.
Abstract (from CDS):
By means of N-body integrations using our bhint code, we study the impact of stellar cusps of different compositions. We find that although the presence of a cusp does have an important effect on the evolution of an otherwise isolated flat disc, its influence on the evolution of disc thickness and warping is rather mild in a two-disc configuration. However, we show that the creation of highly eccentric orbits strongly depends on the graininess of the cusp (i.e. the mean and maximum stellar masses). While Chang recently found that full cycles of Kozai resonance are prevented by the presence of an analytic cusp, we show that relaxation processes play an important role in such highly dense regions and support short-term resonances. We thus find that young disc stars on initially circular orbits can achieve high eccentricities by resonant effects also in the presence of a cusp of stellar remnants, yielding a mechanism to create S-stars and hypervelocity stars.
Furthermore, we discuss the underlying initial mass function (IMF) of the young stellar discs and find no definite evidence for a non-canonical IMF.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): black hole physics - stellar dynamics - methods: {em N}-body simulations - Galaxy: centre
Simbad objects: 4
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