Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..754w&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Sept. 15, 1979, p. 754-760.
Astronomy and Astrophysics
Astrophysics
23
Astrophysics, Brightness, Globular Clusters, Star Distribution, Data Reduction, Relaxation Time, Television Cameras
Scientific paper
Using short-exposure SEC television camera observations, the radial distribution profiles of surface brightness, B-V colors and star densities are determined in three globular clusters, NGC 6440, 6541 and 7099, from about 2-200 arc sec from the cluster centers. Good agreement is found between the surface-brightness profiles and the star-density distributions; both can be fitted well with a King-type curve, and no significant evidence for a presence of cusp at r greater then 3 arc sec is observed. Also determined for the three clusters were central surface brightnesses, core radii, central mass densities, total cluster masses, relaxation times and central escape velocities. In addition, an upper limit of 5000 solar masses is placed on the mass of a possible central black hole in these clusters.
Bahcall Neta A.
Williams Ted B.
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