Importance of Cluster Structural Evolution in Using X-ray and SZE Galaxy Cluster Surveys to Study Dark Energy

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dc.creatorMajumdar, Subhabrata
dc.creatorMohr, Joseph J.
dc.date2002-07-31
dc.date2002-10-07
dc.date.accessioned2026-07-07T11:08:07Z
dc.date.available2026-07-07T11:08:07Z
dc.descriptionWe examine the prospects for measuring the dark energy equation of state parameter w within the context of the still uncertain redshift evolution of galaxy cluster structure. We show that for a particular X-ray survey (SZE survey) the constraints on w degrade by roughly a factor of 3 (factor of 2) when one accounts for the possibility of non--standard cluster evolution. With followup measurements of a cosmology independent, mass--like quantity it is possible to measure cluster evolution, improving constraints on cosmological parameters (like w Omega_M). We examine scenarios where 1%, 10% and 100% of detected clusters are followed up, showing that even a modest followup program can enhance the final cosmological constraints. For the case of followup measurements on 1% of the cluster sample with an uncertainty of 30% on individual cluster mass--like quantities, constraints on w are improved by a factor of 2 to 3. For the best case scenario of a zero curvature universe, these particular X-ray and SZE surveys can deliver uncertainties on w of ~4% to 6%.
dc.descriptionLatex 8 pages, 4 figures, submitted to ApJ June 14
dc.identifierhttps://arxiv.org/abs/astro-ph/0208002
dc.identifierhttp://arxiv.org/abs/astro-ph/0208002
dc.identifierAstrophys.J.585:603-610,2003
dc.identifierdoi:10.1086/346179
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190031
dc.subjectAstrophysics
dc.titleImportance of Cluster Structural Evolution in Using X-ray and SZE Galaxy Cluster Surveys to Study Dark Energy
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