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2009MNRAS.394.1841L - Mon. Not. R. Astron. Soc., 394, 1841-1846 (2009/April-3)
On the number of young stellar discs in the Galactic Centre.
LOCKMANN U. and BAUMGARDT H.
Abstract (from CDS):
By means of N-body simulations using our bhint code, we show that two highly inclined stellar discs with the observed properties cannot be recognized as two flat circular discs after 5Myr of mutual interaction. Instead, our calculations predict a significant warping of the two discs, which we show to be apparent among the structures observed in the Galactic Centre. While the high eccentricities of the observed counter-clockwise orbits suggest an eccentric origin of this system, we show the eccentricity distribution in the inner part of the more massive clockwise disc to be perfectly consistent with an initially circular disc in which stellar eccentricities increase due to both non-resonant and resonant relaxation.
We conclude that the relevant question to ask is therefore not whether there are two discs of young stars, but whether there were two such discs to begin with.
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: 3
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