The structure of eight globular clusters

Details The structure of eight globular clusters The structure of eight globular clusters

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213...93b&link_type=abstract

Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 93-99.

Astronomy and Astrophysics

Astronomy

15

Black Holes (Astronomy), Globular Clusters, Radial Distribution, Star Distribution, X Ray Sources, Escape Velocity, Galactic Structure, Relaxation Time, Stellar Mass

Scientific paper

Star counts on short-exposure plates are presented for eight globular clusters. The data are given to several limiting magnitudes for each cluster. Projected radial distributions are determined from the star counts; no significant segregation is observed among the distributions to various limiting magnitudes. The structural parameters of the clusters (core radii and concentration factors) are determined from best-fitting King curves to the observed distributions. The central densities, total masses, central escape velocities, and relaxation times are also calculated. NGC 6093 (M80) and NGC 7099 (M30) have dense compact stellar cores, similar to the established globular X-ray sources. Upper limits are given for the masses of possible central black holes in the eight clusters.

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