Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cemda..99..161i&link_type=abstract
Celestial Mechanics and Dynamical Astronomy, Volume 99, Issue 3, pp.161-168
Astronomy and Astrophysics
Astronomy
1
Galaxy: Kinematics &Amp, Dynamics, Galaxy: Resonances &Amp, Third Integral, Galaxy: Solar Neighborhood
Scientific paper
The classical assumption that most globular clusters (hereafter GC) formed in situ in galactic halos is examined in an approximate, empirical way. Although this viewpoint is not rejected per se, an alternative possibility is investigated: the presence of multiple resonances in the galactic disk, together with the concurrent action of a resonant internal bar or distortion, may stir these resonances. This may lead to chaotic motion which breaks the action of the third integral for moderately eccentric orbits. These circumstances may consequently allow the formation of some GC’s in the disk with moderate to highly eccentric orbits, with the action of the resonant bar subsequently gradually driving them (as well as other stars with similar orbits) to spend most of their time in the Galaxy’s halo. The size of the resonant region and the probable effectiveness of the various agents in the associated phase space in the axisymmetric model are listed. An n-body simulation would be required to establish this proposal in a fully self-consistent way.
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