A Capture Scenario for Globular Cluster Omega Centauri

Details A Capture Scenario for Globular Cluster Omega Centauri A Capture Scenario for Globular Cluster Omega Centauri

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dda....34.0402t&link_type=abstract

American Astronomical Society, DDA meeting #34, #04.02; Bulletin of the American Astronomical Society, Vol. 35, p.1036

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent advances in understanding the nature of omega Centauri - the most massive Milky Way globular cluster - have now placed on a firmer ground its accretion origin as opposed to formation within the Milky Way. Unlike the majority of the Milky Way globular clusters, omega Cen is a complex chemical system with an extended star-formation history.
We explore an accretion origin for omega Cen by N-body modeling of the orbital decay and disruption of a Milky-Way dwarf satellite. We find that a capture scenario can produce an omega Cen-like object with the current low energy orbit of the cluster. Our best model is a nucleated dwarf galaxy with a Hernquist density profile that has a mass of 8 x 109 Msun, and a half-mass radius pf 1.4 kpc.
This work has been supported by NSF grant AST-0098687.

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