Other
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84...15q&link_type=abstract
Astronomical Journal, vol. 84, Jan. 1979, p. 15-21, 23-26.
Other
67
Astronomical Models, Galactic Clusters, Isothermal Processes, Mass Distribution, Thermal Simulation, Astronomical Photometry, Density Distribution, Galactic Nuclei, Separation
Scientific paper
A chi-squared fitting procedure is used to fit isothermal models to recent photometric data on the Coma cluster and the elliptically dominated southern cluster CA 0340-538. Series of models are obtained for various magnitude limits in the range from 14.4 to 19.0. For the Coma cluster it is found that: (1) the core radius of the best-fitted bounded isothermal models increases by about a factor of 2 over at least a 3-magnitude interval as fainter limiting magnitudes are considered; (2) the projected galaxy density in the cluster exhibits a central spike with a maximum of about 1.5 to 2 times the model density; and (3) the importance of the spike is somewhat larger at faint magnitudes, the position of the peak is at or very near NGC 4874, and its radius is about 0.15 Mpc. The results for CA 0340-538 indicate that core radius varies significantly as a function of limiting magnitude. The general trend in both clusters for core radius to increase linearly with magnitude in the first approximation is attributed to mass segregation on a much larger scale than previously recognized.
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