Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-17
Astronomy and Astrophysics
Astrophysics
10 pages, to appear in IAUS246: Dynamical Evolution of Dense Stellar Systems, eds: E. Vesperini, M. Giersz, A. Sills
Scientific paper
10.1017/S1743921308015202
Most stars form in dense star clusters deeply embedded in residual gas. These objects must therefore be seen as the fundamental building blocks of galaxies. With this contribution some physical processes that act in the very early and also later dynamical evolution of dense stellar systems in terms of shaping their later appearance and properties, and the impact they have on their host galaxies, are highlighted. Considering dense systems with increasing mass, it turns out that near 10^6 Msol their properties change fundamentally: stellar populations become complex, a galaxial mass--radius relation emerges and the median two-body relaxation time becomes longer than a Hubble time. Intriguingly, only systems with a two-body relaxation time longer than a Hubble time show weak evidence for dark matter, whereby dSph galaxies form total outliers.
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