Clusters in Various Cosmological Models: Abundance and Evolution

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dc.creatorGross, Michael A. K.
dc.creatorSomerville, Rachel S.
dc.creatorPrimack, Joel R.
dc.creatorBorgani, Stefano
dc.creatorGirardi, Marisa
dc.date1997-11-04
dc.date.accessioned2026-07-07T02:24:56Z
dc.date.available2026-07-07T02:24:56Z
dc.descriptionThe combination of measurements of the local abundance of rich clusters of galaxies and its evolution to higher redshift offers the possibility of a direct measurement of $Ω_0$ with little contribution from other cosmological parameters. We investigate the significance of recent claims that this evolution indicates that $Ω_0$ must be small. The most recent cluster velocity dispersion function from a compilation including the ESO Northern Abell Cluster Survey (ENACS) results in a significantly higher normalization for models, corresponding to $σ_8\approx 0.6$ for $Ω_0=1$, compared to the Eke, Cole, & Frenk result of $σ_8=0.52\pm 0.04$. Using the ENACS data for a $z=0$ calibration results in strong evolution in the abundance of clusters, and we find that the velocity dispersion function is consistent with $Ω_0=1$. The results are dependent upon the choice and analysis of low-redshift and high-redshift data, so at present, the data is not good enough to determine $Ω_0$ unambiguously.
dc.description4 pages Latex using sprocl.sty, 1 figure. To appear in Proceedings of 12th Potsdam Cosmology Workshop, "Large-Scale Structure: Tracks and Traces" Sept. 15-19, 1997
dc.identifierhttps://arxiv.org/abs/astro-ph/9711035
dc.identifierhttp://arxiv.org/abs/astro-ph/9711035
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11746
dc.subjectAstrophysics
dc.titleClusters in Various Cosmological Models: Abundance and Evolution
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