Present and past death rates for globular clusters

Details Present and past death rates for globular clusters Present and past death rates for globular clusters

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..629l&link_type=abstract

Astrophysical Journal, Part 1, vol. 219, Jan. 15, 1978, p. 629-634.

Mathematics

Logic

26

Astronomical Models, Cosmology, Globular Clusters, Relaxation Time, Stellar Evolution, Astrodynamics, Curve Fitting, Data Smoothing, Many Body Problem, Stellar Motions

Scientific paper

The observed distribution of globular-cluster central relaxation times is fitted very well by a death-rate function which is a power law in cosmological time. A fit for this function is performed, and it is inferred that: (1) existing clusters are collapsing smoothly to some state in which they are no longer recognizable as globular clusters; there is no excess of clusters 'hanging up at the edge' of collapse; (2) the number of clusters already 'dead' is between about 2 and 1000 times the number now present, depending on the (uncertain) time of cluster formation; and (3) the remaining lifetime of a cluster is in the range of approximately 50 to 120 central relaxation time scales, in good agreement with previous theoretical investigations of core collapse.

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