The initial violent dynamics of globular clusters

Details The initial violent dynamics of globular clusters The initial violent dynamics of globular clusters

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..381m&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Dense Stellar Systems

Scientific paper

In order to investigate some relevant aspects of globular clusters formation we studied numerically the dynamics of a self-gravitating stellar system of the size of a typical globular cluster starting from non-equilibrium and 'cold' initial conditions. Such conditions are indeed those expected after the formation of the stellar system i.e. after the complete exhaustion of primordial gas through the gas-star phase transition which occurred on the star-formation time scale. Our (preliminary) results allow to draw some meaningful conclusions about the evolution of the distribution function toward a meta-stable state by mean of the quick 'violent relaxation' of the whole system (core formation mass segregation anisotropy...). To this virialized state follows the well known further evolution caused by star-star encounters. We underline that the initial 'violent' dynamics can be well investigated by mean of codes (like our own tree-code) which are efficient in the representation of the time evolution driven by the quick mean-field variations even if the individual 2-body close interactions (which are not really relevant in this phase) are not followed in detail.

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