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Mass segregation in a star cluster is studied in an analytical manner. Weconsider a two-component cluster, which consists of two types of stars withdifferent masses. Plummer's model is used for the initial condition. We tracethe overall behaviors of the probability distribution functions of the twocomponents and obtain the timescale of mass segregation as a simple function ofthe cluster parameters. The result is used to discuss the origin of a blackhole with mass of > 1000 M(sun) found in the starburst galaxy M82.Comment: 12 pages, 1 ps file for 2 figures, to appear in The Astrophysical  Journa

Mass Segregation in Star Clusters: Analytic Estimation of the Timescale