Computer Science – Graphics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.3606w&link_type=abstract
American Astronomical Society Meeting 210, #36.06; Bulletin of the American Astronomical Society, Vol. 39, p.150
Computer Science
Graphics
Scientific paper
We present a framework for understanding the demographics of star cluster systems, and develop a toy model which incorporates a universal initial power law mass function, selected formation histories, selected disruption laws, and a convolution with common artifacts and selection effects found in observational data. A wide variety of observations can be explained by this simple model, including the observed correlation between the brightest young cluster in a galaxy and the total number of young clusters. A model of the Antennae galaxies is developed and compared with the observational data. An important component of our model is the use of a two-stage disruption process, with a very high ``infant mortality'' rate for the clusters with ages less than 10**8 yrs (i.e., roughly 80 - 90% are lost each factor of ten in time, independent of mass), and two-body relaxation, which becomes the dominant disruption mechanism at older ages, preferentially removing the lower mass clusters. We note that a 80 - 90 % infant mortality rate for each factor of ten in time is consistent with all measured young cluster populations, including those in the Antennae, Small Magellanic Cloud, and the Milky Way.
Chandar Rupali
Fall Mouhamed Moustapha
Whitmore Bradley C.
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