期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 700, 期 2, 页码 L99-L103出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/700/2/L99
关键词
galaxies: star clusters; methods: N-body simulations; stars: formation; stellar dynamics
资金
- STFC
- Netherlands Advanced School in Astrophysics (NOVA)
- LKBF
- Netherlands Organization for Scientific Research (NWO)
- PPARC/STFC [PP/D002036/1]
- International Space Science Institute in Bern, Switzerland
- STFC [PP/D002036/1] Funding Source: UKRI
We discuss the observations and theory of star cluster formation to argue that clusters form dynamically cool (subvirial) and with substructure. We then perform an ensemble of simulations of cool, clumpy (fractal) clusters and show that they often dynamically mass segregate on timescales far shorter than expected from simple models. The mass segregation comes about through the production of a short-lived, but very dense core. This shows that in clusters like the Orion Nebula Cluster the stars >= 4 M(circle dot) can dynamically mass segregate within the current age of the cluster. Therefore, the observed mass segregation in apparently dynamically young clusters need not be primordial, but could be the result of rapid and violent early dynamical evolution.
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