Rates of collapse and evaporation of globular clusters

Details Rates of collapse and evaporation of globular clusters Rates of collapse and evaporation of globular clusters

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.359..806h&link_type=abstract

Nature (ISSN 0028-0836), vol. 359, no. 6398, p. 806-808.

Computer Science

29

Evaporation, Globular Clusters, Gravitational Collapse, Stellar Evolution, Galactic Bulge, Galactic Structure

Scientific paper

Observational estimates of the dynamical relaxation times of Galactic globular clusters are used here to estimate the present rate at which core collapse and evaporation are occurring in them. A core collapse rate of 2 +/- 1 per Gyr is found, which for a Galactic age of about 12 Gyr agrees well with the fact that 27 clusters have surface brightness profiles with the morphology expected for the postcollapse phase. A destruction and evaporation rate of 5 +/- 3 per Gyr is found, suggesting that a significant fraction of the Galaxy's original complement of globular clusters have perished through the combined effects of mechanisms such as relaxation-driven evaporation and shocking due to interaction with the Galactic disk and bulge.

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