Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-14
Mon.Not.Roy.Astron.Soc. 346 (2003) L11
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures, accepted in MNRAS (Pink page)
Scientific paper
10.1046/j.1365-2966.2003.07275.x
We first present a self-consistent dynamical model in which $\omega$ Cen is formed from an ancient nucleated dwarf galaxy merging with the first generation of the Galactic thin disc in a retrograde manner with respect to the Galactic rotation. Our numerical simulations demonstrate that during merging between the Galaxy and the $\omega$ Cen's host dwarf with $M_{\rm B}$ $\simeq$ -14 mag and its nucleus mass of $10^7$ $M_{\odot}$, the outer stellar envelope of the dwarf is nearly completely stripped whereas the central nucleus can survive from the tidal stripping because of its compactness. The developed naked nucleus has a very bound retrograde orbit around the young Galactic disc, as observed for $\omega$ Cen, with its apocenter and pericenter distances of $\sim$ 8 kpc and $\sim$ 1 kpc, respectively. The Galactic tidal force can induce radial inflow of gas to the dwarf's center and consequently triggers moderately strong nuclear starbursts in a repetitive manner. This result implies that efficient nuclear chemical enrichment resulting from the later starbursts can be closely associated with the origin of the observed relatively young and metal-rich stars in $\omega$ Cen. Dynamical heating by the $\omega$ Cen's host can transform the young thin disc into the thick disc during merging.
Bekki Kenji
Freeman Ken C.
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