Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · astro-ph/9704060

The CNOC Cluster Survey: Omega, sigma_8, Phi(L,z) Results, and Prospects for Lambda Measurement

R. G. Carlberg·H. K. C. Yee·H. Lin·C. W. Shepherd·P. Gravel·E. Ellingson·S. L. Morris·D. Schade·J. E. Hesser·J. B. Hutchings·J. B. Oke·R. Abraham·M. Balogh·G. Wirth·F. D. A. Hartwick·C. J. Pritchet·T. Smecker-Hane
View original source ↗Read source document ↗Export metadata ↓

Abstract

Rich galaxy clusters are powerful probes of both cosmological and galaxy evolution parameters. The CNOC cluster survey was primarily designed to distinguish between Omega=1 and Omega~0.2 cosmologies. Projected foreground and background galaxies provide a field sample of comparable size. The results strongly support a low-density universe. The luminous cluster galaxies are about 10-30% fainter, depending on color, than the comparable field galaxies, but otherwise they show a slow and nearly parallel evolution. On the average, there is no excess star formation when galaxies fall into clusters. These data provide the basis for a simple Lambda measurement using the survey's clusters and the field data. The errors in Omega_M, Lambda, sigma_8 and galaxy evolution parameters could be reduced to a few percent with a sample of a few hundred clusters spread over the 0<z<1 range.

Explore related subjects

astro-ph

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

R. G. Carlberg, H. K. C. Yee, H. Lin, C. W. Shepherd, P. Gravel, E. Ellingson, S. L. Morris, D. Schade, J. E. Hesser, J. B. Hutchings, J. B. Oke, R. Abraham, M. Balogh, G. Wirth, F. D. A. Hartwick, C. J. Pritchet, T. Smecker-Hane. 1997-04-08. The CNOC Cluster Survey: Omega, sigma_8, Phi(L,z) Results, and Prospects for Lambda Measurement. https://arxiv.org/abs/astro-ph/9704060

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Cosmic Conundrums with Quantum Corrections

Darh energy was discovered over 25 years ago and we do not have an explanation of it. Dark matter comprises 95% of matter in the universe and we still don't know what it is. The Webb telescope has been finding fully formed galaxies with massive black holes millions of times the mass of the sun in the early universe and we don't have any explanation. A quantum density limitation will be used to solve these and other outstanding problems.

astro-ph↗
arXiv2026

On binary pulsars and the force of gravity

The energy-momentum budget of the astrophysical systems can be studied by the exact local conservation equation derived by Landau and Lifshitz. We show that a similar equation is valid for the Einstein-Cartan gravity. We reanalyze a binary pulsar system using the Landau-Lifshitz conservation equation and show that the orbital period change rate can be completely understood as a curvature backreaction process. Taking into account the detailed theoretical and observational research of relativistic binary pulsar systems, especially the system of Hulse and Taylor, we conclude that general relativity and astrophysical observations rule out the existence of gravitational radiation. We comment upon the LIGO GW events and their alternative explanation, as well as the recent pulsar timing arrays data.

astro-ph↗
arXiv2026

Oscillation frequencies and mode lifetimes in alpha Centauri A

We analyse our recently-published velocity measurements of alpha Cen A (Butler et al. 2004). After adjusting the weights on a night-by-night basis in order to optimize the window function to minimize sidelobes, we extract 42 oscillation frequencies with l=0 to 3 and measure the large and small frequency separations. We give fitted relations to these frequencies that can be compared with theoretical models and conclude that the observed scatter about these fits is due to the finite lifetimes of the oscillation modes. We estimate the mode lifetimes to be 1-2 d, substantially shorter than in the Sun.

astro-ph↗