What determines the mass of the most massive star cluster in a galaxy: statistics, physics or disruption?

Gieles, M (2008) What determines the mass of the most massive star cluster in a galaxy: statistics, physics or disruption? Astrophys.Space Sci.324:299-304,2009.

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Abstract

In many different galactic environments the cluster initial mass function (CIMF) is well described by a power-law with index -2. This implies a linear relation between the mass of the most massive cluster (M_max) and the number of clusters. Assuming a constant cluster formation rate and no disruption of the most massive clusters it also means that M_max increases linearly with age when determining M_max in logarithmic age bins. We observe this increase in five out of the seven galaxies in our sample, suggesting that M_max is determined by the size of the sample. It also means that massive clusters are very stable against disruption, in disagreement with the mass independent disruption (MID) model presented at this conference. For the clusters in M51 and the Antennae galaxies the size-of-sample prediction breaks down around 10^6 M_sun, suggesting that this is a physical upper limit to the masses of star clusters in these galaxies. In this method there is a degeneracy between MID and a CIMF truncation. We show how the cluster luminosity function can serve as a tool to distinguish between the two.

Item Type:	Article
Authors :	Name Email ORCID Gieles, M m.gieles@surrey.ac.uk
Date :	17 January 2008
DOI :	10.1007/s10509-009-0102-y
Related URLs :	Author Publisher
Depositing User :	Symplectic Elements
Date Deposited :	17 May 2017 12:39
Last Modified :	16 Jan 2019 18:34
URI:	http://epubs.surrey.ac.uk/id/eprint/836230

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