Substructure in Clusters as a Cosmological Test

Details Substructure in Clusters as a Cosmological Test Substructure in Clusters as a Cosmological Test

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.8704c&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #87.04; Bulletin of the American Astronomical Society, Vol. 25, p.1427

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Once believed to be relaxed systems, clusters of galaxies are now observed to contain substructure. The amount of substructure observed may prove to be a useful cosmological test; clusters form earlier in a less dense universe, and therefore have more time to relax. We have used N-body simulations to quantify the amount of cluster substructure for cosmologies with Omega_o = 1.0,Omega_o = 0.2,Omega_o = 0.1, and Omega_o = 0.2, lambda_o = 0.8 for initial power spectra P(k) = Ak(n) with n = -2, -1, 0. Tests used to quantify substructure include the Lee-Fitchett and Dressler-Schectman statistics, as well as a shift in the center-of-mass with density cutoff. We find significantly more substructure in the denser universes. How observable these differences are is currently under investigation.

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