The Initial Mass Function of the Galactic Old Halo Cluster System

Details The Initial Mass Function of the Galactic Old Halo Cluster System The Initial Mass Function of the Galactic Old Halo Cluster System

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..388..415p&link_type=abstract

Mass Loss from Stars and the Evolution of Stellar Clusters ASP Conference Series, Vol. 388, proceedings of the conference held 2

Astronomy and Astrophysics

Astronomy

Scientific paper

Evidence favouring a Gaussian initial mass function (IMF) for systems of old globular clusters (GC) has accumulated over recent years. We show that a bell-shaped mass function may be the imprint of expulsion from the protocluster of the leftover star forming gas due to supernova activity. Owing to the weakening of its gravitational potential, the protocluster retains a fraction only of its newly formed stars. The mass fraction of bound stars extends from zero to unity depending on the star formation efficiency ɛ achieved by the protoglobular cloud. We investigate how such wide variations affect the mapping of the protoglobular cloud mass function to the GC IMF. A power-law cloud mass function truncated at low mass generates bell-shaped cluster IMFs, the turnover location being mostly driven by the lower limit of the cloud mass range.

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