%0 Generic %1 Bahcall1998 %A Bahcall, Neta A. %A Fan, Xiaohui %D 1998 %K Clusters Dark Galaxy Matter %T The Most Massive Distant Clusters: Determining Omega and sigma_8 %U http://arxiv.org/abs/astro-ph/9803277 %X The existence of the three most massive clusters of galaxies observed so far at z>0.5 is used to constrain the mass density parameter of the universe, Omega, and the amplitude of mass fluctuations, sigma_8. We find Omega=0.2 (+0.3,-0.1), and sigma_8=1.2 (+0.5,-0.4) (95 %). We show that the existence of even the single most distant cluster at z=0.83, MS1054-03, with its large gravitational lensing mass, high temperature, and large velocity dispersion, is sufficient to establish powerful constraints. High-density, Omega=1 (sigma_8 ~ 0.5-0.6) Gaussian models are ruled out by these data (< 10^-6 probability); the Omega=1 models predict only ~10^-5 massive clusters at z > 0.65 (~10^-3 at z > 0.5) instead of the 1 (3) clusters observed.

@misc{Bahcall1998, abstract = { The existence of the three most massive clusters of galaxies observed so far at z>0.5 is used to constrain the mass density parameter of the universe, Omega, and the amplitude of mass fluctuations, sigma_8. We find Omega=0.2 (+0.3,-0.1), and sigma_8=1.2 (+0.5,-0.4) (95 %). We show that the existence of even the single most distant cluster at z=0.83, MS1054-03, with its large gravitational lensing mass, high temperature, and large velocity dispersion, is sufficient to establish powerful constraints. High-density, Omega=1 (sigma_8 ~ 0.5-0.6) Gaussian models are ruled out by these data (< 10^{-6} probability); the Omega=1 models predict only ~10^{-5} massive clusters at z > 0.65 (~10^{-3} at z > 0.5) instead of the 1 (3) clusters observed. }, added-at = {2011-04-23T18:53:30.000+0200}, author = {Bahcall, Neta A. and Fan, Xiaohui}, biburl = {https://www.bibsonomy.org/bibtex/25959653151ba0e18905ddb068b6cef31/ad4}, description = {The Most Massive Distant Clusters: Determining Omega and sigma_8}, interhash = {c9a74267791af8c038f5685d5aebd6a0}, intrahash = {5959653151ba0e18905ddb068b6cef31}, keywords = {Clusters Dark Galaxy Matter}, note = {cite arxiv:astro-ph/9803277 Comment: 14 pages, 4 Postscript figures, ApJ in press}, timestamp = {2011-04-23T18:53:30.000+0200}, title = {The Most Massive Distant Clusters: Determining Omega and sigma_8}, url = {http://arxiv.org/abs/astro-ph/9803277}, year = 1998 }