The Baltimore and Utrecht models for cluster dissolutionReportar como inadecuado

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Astrophysics and Space Science

, Volume 324, Issue 2–4, pp 183–186

First Online: 15 September 2009Received: 24 January 2008Accepted: 12 March 2008


The analysis of the age distributions of star cluster samples of different galaxies has resulted in two very different empirical models for the dissolution of star clusters: the Baltimore model and the Utrecht model. I describe these two models and their differences. The Baltimore model implies that the dissolution of star clusters is mass independent and that about 90% of the clusters are destroyed each age dex, up to an age of about a Gyr, after which point mass-dependent dissolution from two-body relaxation becomes the dominant mechanism. In the Utrecht model, cluster dissolution occurs in three stages: i mass-independent infant mortality due to the expulsion of gas up to about 10 yr; ii a phase of slow dynamical evolution with strong evolutionary fading of the clusters lasting up to about a Gyr; and iii a phase dominated by mass-dependent dissolution, as predicted by dynamical models. I describe the cluster age distributions for mass-limited and magnitude-limited cluster samples for both models. I refrain from judging the correctness of these models.

KeywordsStar clusters Star cluster systems Star cluster evolution Dynamical evolution  Download to read the full article text

Autor: Henny J. G. L. M. Lamers


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