The globular cluster M15 - Gravitational-focusing effects

Details The globular cluster M15 - Gravitational-focusing effects The globular cluster M15 - Gravitational-focusing effects

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mvsfa..31...68m&link_type=abstract

Moskovskii Universitet, Vestnik, Seriia 3 - Fizika, Astronomiia (ISSN 0579-9392), vol. 31, May-June 1990, p. 68-71. In Russian.

Mathematics

Probability

Electromagnetic Radiation, Focusing, Globular Clusters, Gravitational Lenses, Stellar Gravitation, Brightness Distribution, Gravitational Effects, Maximum Likelihood Estimates, Statistical Analysis

Scientific paper

The central part of M15 was investigated in a search for the gravitational-focusing effect. The existence of this effect is confirmed by a comparison of the value of the variance of the stellar brightness of the central part of the cluster (where the probability of the effect is greatest) with that in a part removed from the center. The maximum likelihood method is used to estimate the value of the variance.

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