Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84...40s&link_type=abstract
Astronomical Journal, vol. 84, Jan. 1979, p. 40-49.
Astronomy and Astrophysics
Astronomy
6
Density Distribution, Galactic Clusters, Many Body Problem, Spatial Distribution, Astronomical Models, Luminous Intensity, Mass Spectra, Monte Carlo Method, Velocity Distribution
Scientific paper
Wielen's (1974) N-body simulations are used for empirical comparison with 15 observed rich clusters of galaxies. The Kolmogoroff-Smirnoff one-sample test is applied to three-dimensional number-density profiles derived from Wielen's N-body simulations (N = 50, 250, 500) of virtually stable clusters. It is found that simple power-law fits to the number-density profiles are poor fits, which suggests that structure is present in the profiles. This structure is identified with the local minimum noted by Oemler (1974) in the surface brightness profiles of clusters of galaxies at radii of approximately 0.4 times the virial radii. Statistical simulations of the envelopes of the number-density profiles via Monte Carlo techniques indicate that local minima occur in about 5% to 9% of the cases if the total mass sample is considered. It is concluded that the number-density profiles of Wielen's simulations mimic those of observed clusters.
Bludman Sidney A.
Struble Mitchell F.
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