Year: 2009
Type: article
Abstract: Chandra observations of large samples of galaxy clusters detected in X-rays by ROSAT provide a new, robust determination of the cluster mass functions at low and high redshifts. Statistical and systematic errors are now sufficiently small, and the redshift leverage sufficiently large for the mass function evolution to be used as a useful growth of a structure-based dark energy probe. In this paper, we present cosmological parameter constraints obtained from Chandra observations of 37 clusters with 〈 z 〉 = 0.55 derived from 400 deg 2 ROSAT serendipitous survey and 49 brightest z ≈ 0.05 clusters detected in the All-Sky Survey. Evolution of the mass function between these redshifts requires Ω Λ > 0 with a ∼5σ significance, and constrains the dark energy equation-of-state parameter to w 0 = −1.14 ± 0.21, assuming a constant w and a flat universe. Cluster information also significantly improves constraints when combined with other methods. Fitting our cluster data jointly with the latest supernovae, Wilkinson Microwave Anisotropy Probe , and baryonic acoustic oscillation measurements, we obtain w 0 = −0.991 ± 0.045 (stat) ±0.039 (sys), a factor of 1.5 reduction in statistical uncertainties, and nearly a factor of 2 improvement in systematics compared with constraints that can be obtained without clusters. The joint analysis of these four data sets puts a conservative upper limit on the masses of light neutrinos ∑ m ν < 0.33 eV at 95% CL. We also present updated measurements of Ω M h and σ 8 from the low-redshift cluster mass function.
Source: The Astrophysical Journal
Authors: A. Vikhlinin, A. V. Kravtsov, R. A. Burenin, H. Ebeling, W. R. Forman, A. Hornstrup, C. Jones, S. S. Murray, D. Nagai, H. Quintana, A. Voevodkin
Language: Russian
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, National Aeronautics and Space Administration, University of Chicago, Sherman Fairchild Foundation, Russian Foundation for Fundamental Investigations, Russian Foundation for Basic Research, Fondo de Financiamiento de Centros de Investigación en Áreas Prioritarias
Awards: PHYSICS OF GALAXY CLUSTERS & HOW IT AFFECTS COSMO LOGICAL TESTS, CAREER: Simulations of Galaxy and Cluster Formation: The New Frontiers, COLLABORATIVE RESEARCH: Modeling formation of dwarf galaxies from the Cosmic Renaissance to the Present, HIGH-RESOLUTION SIMULATONS OF GALAXY CLUSTERS: TH EORY VS. OBSERVATIONS, G8216821000, G8945776167
OpenAlex ID: W1981758713