The Star Cluster Population of M51: III. Cluster disruption and formation history
arXiv:astro-ph/0506066 · doi:10.1051/0004-6361:20052914
Abstract
In this work we concentrate on the evolution of the cluster population of the interacting galaxy M51 (NGC 5194), namely the timescale of cluster disruption and possible variations in the cluster formation rate. We present a method to compare observed age vs. mass number density diagrams with predicted populations including various physical input parameters like the cluster initial mass function, cluster disruption, cluster formation rate and star bursts. If we assume that the cluster formation rate increases at the moments of the encounters with NGC 5195, we find an increase in the cluster formation rate of a factor of 3, combined with a disruption timescale which is slightly higher then when assuming a constant formation rate (t_4 = 200 Myr vs. 100 Myr). The measured cluster disruption time is a factor of 5 shorter than expected on theoretical grounds. This implies that the disk of M51 is not a preferred location for survival of young globular clusters, since even clusters with masses of the order of 10^6 M_sun will be destroyed within a few Gyr.
13 pages, A&A, accepted
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