Other
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..557b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 557-567.
Other
126
Cusps, Density Distribution, Galactic Clusters, Galactic Evolution, Hubble Constant, X Ray Sources
Scientific paper
It is argued in this paper that the isothermal sphere, or any other model which presumes a constant density core, is a poor description of central cluster regions. It is suggested that cores found by many authors are the result of misplaced cluster centers, and that the accurate specification of a cluster center is far more important for determining the true density distribution that has been generally appreciated. The central density behavior of galactic clusters can be investigated when the center is specified independently of the galaxy distribution. Two means of externally specifying a cluster's center are used here: the peaks in the X-ray surface brightness and the location of D or cD galaxies. It is shown that galaxy density profiles constructed about either of these external centers are power laws with slope -1. These power laws extend from the cluster center out to about 1/h Mpc (H(0) = 11 h-km/s/Mpc), where the data become incomplete.
Beers Timothy C.
Tonry John L.
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