The Omega Dependence of the Shape of Clusters

Details The Omega Dependence of the Shape of Clusters The Omega Dependence of the Shape of Clusters

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...18912215c&link_type=abstract

American Astronomical Society, 189th AAS Meeting, late abstracts, #122.15; Bulletin of the American Astronomical, Vol. 29, p. 73

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Scientific paper

High-resolution, ~ 50 kpc, numerical simulations are used to measure the ellipticity of the about 20 more massive clusters in each of the two following scenarios: a standard Omega_0 = 1.0 universe, normalized to COBE, and an open universe with Omega_0 = 0.2, normalized to sigma_8 = 1.0. The following conclusions are drawn: as previously established by other authors (see, for example, West, Dekel, & Oemler 1989) we find that clusters tend to be rounder at smaller radii. We also find that clusters tend to be rounder in the low-density scenario, as seen in hydrodinamical simulations (see, for example, Evrard 1994) or pure dark matter simulations (see, for example, de Theije et al. 1995). The difference in the mean ellipticity between both scenarios decreases to the center of the cluster. A scales close to the resolution limit ( < 0.2 Mpc) the average ellipticity in the Omega_0 = 1.0 scenario is already lower than that in the low-density scenario. This could be due to an omega-dependent spurious scattering or two-body relaxation.

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