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2005MNRAS.363..326P - Mon. Not. R. Astron. Soc., 363, 326-336 (2005/October-2)
New light on the initial mass function of the Galactic halo globular clusters.
PARMENTIER G. and GILMORE G.
Abstract (from CDS):
(i) the presently observed mass density profile and number density profile of the Old Halo cluster system show the same shape;
(ii) assuming that globular clusters were initially distributed the same way in mass at all galactocentric distances, the mass and number density profiles had also the same shape initially; and
(iii) according to our simulations, the mass density profile remains well preserved, irrespective of the initial cluster mass spectrum, while the temporal evolution of its number counterpart depends sensitively on initial conditions.
We show that to obtain a mass density profile and a number density profile that are identical in shape, both initially and after a Hubble time of evolution, the globular cluster system must have been depleted in low-mass objects from the beginning. We deduce that the initial distribution in mass of the globular clusters was either a lognormal mass function, similar to that today, or a power-law mass spectrum with a slope ≃-2 and truncated at large mass, say, around 105M☉. In contrast, a power-law mass spectrum with a similar slope but extending down to low cluster mass (i.e. a few thousand solar masses) seems to be ruled out.
Abstract Copyright: 2005 RAS
Journal keyword(s): Galaxy: formation - globular clusters: general - Galaxy: halo
Simbad objects: 10
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