The Age Distribution of Massive Star Clusters in the Antennae Galaxies

Details The Age Distribution of Massive Star Clusters in the Antennae Galaxies The Age Distribution of Massive Star Clusters in the Antennae Galaxies

2005-09-12

arxiv.org/abs/astro-ph/0509293v1

Astrophys.J.631:L133-L136,2005

Astronomy and Astrophysics

Astrophysics

11 pages, 2 figures. To appear in the ApJ Letters; Submitted 2004 July 29; accepted 2005 August 3

Scientific paper

10.1086/496878

We determine the age distribution of star clusters in the Antennae galaxies (NGC 4038/9) for two mass-limited samples (M > 3 x 10^4 M_{\odot} and M > 2 x 10^5 M_{\odot}). This is based on integrated broadband UBVI and narrowband H-alpha photometry from deep images taken with the Hubble Space Telescope. We find that the age distribution of the clusters declines steeply, approximately as dN/d\tau \propto \tau^{-1}. The median age of the clusters is ~10^7 yr, which we interpret as evidence for rapid disruption ("infant mortality"). It is very likely that most of the young clusters are not gravitationally bound and were disrupted near the times they formed by the energy and momentum input from young stars to the interstellar matter of the protoclusters. At least 20% and possibly all stars form in clusters and/or associations, including those that are unbound and short-lived.

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