Please note that eDoc will be permanently shut down in the first quarter of 2021!      Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Quick Search
My eDoc
Session History
Support Wiki
Direct access to
document ID:

          Institute: MPI für extraterrestrische Physik     Collection: Theory & Complex Plasmas     Display Documents

ID: 5770.0, MPI für extraterrestrische Physik / Theory & Complex Plasmas
The ROSAT-ESO Flux-Limited X-ray (REFLEX) galaxy cluster survey - VI. Constraints on the cosmic matter density from the KL power spectrum
Authors:Schuecker, Peter; Guzzo, Luigi; Collins, Chris A.; Böhringer, Hans
Date of Publication (YYYY-MM-DD):2002-09-21
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. R. Astron. Soc.
Issue / Number:3
Start Page:807
End Page:816
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The Karhunen-Loeve (KL) eigenvectors and eigenvalues of the sample correlation matrix are used to analyse the spatial fluctuations of the REFLEX clusters of galaxies. The method avoids the disturbing effects of correlated power spectral densities that affect all previous cluster measurements on Gpc scales. Comprehensive tests use a large set of independent REFLEX-like mock cluster samples extracted from the Hubble Volume Simulation. It is found that unbiased measurements on Gpc scales are possible with the REFLEX data. The distribution of the KL eigenvalues is consistent with a Gaussian random field on the 93.4 per cent confidence level. Assuming spatially flat cold dark matter models, the marginalization of the likelihood contours over different sample volumes, fiducial cosmologies, mass-X-ray luminosity relations and baryon densities, yields a 95.4 per cent confidence interval for the matter density of 0.03 < &UOmega;(m)h(2) < 0.19. The N-body simulations show that cosmic variance, although difficult to estimate, is expected to increase the confidence intervals by about 50 per cent.
Free Keywords:galaxies : clusters : general; galaxies : statistics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85740; Garching, Germany; Max Planck Inst Extraterr Phys, D-85740 Garching, Germany; Osserv Astron Brera, I-22055 Merate, LC, Italy; Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.