Calibration of the Mass-Temperature Relation for Clusters of Galaxies Using Weak Gravitational Lensing

Abstract

The main uncertainty in current determinations of the power spectrum normalization, sigma_8, from abundances of X-ray luminous galaxy clusters arises from the calibration of the mass-temperature relation. We use our weak lensing mass determinations of 30 clusters from the hitherto largest sample of clusters with lensing masses, combined with X-ray temperature data from the literature, to calibrate the normalization of this relation at a temperature of 8 keV, M_{500c,8 keV}=(8.7 +/- 1.6) h^{-1} 10^{14} M_sun. This normalization is consistent with previous lensing-based results based on smaller cluster samples, and with some predictions from numerical simulations, but higher than most normalizations based on X-ray derived cluster masses. Assuming the theoretically expected slope alpha=3/2 of the mass-temperature relation, we derive sigma_8 = 0.88 +/-0.09 for a spatially-flat LambdaCDM universe with Omega_m = 0.3. The main systematic errors on the lensing masses result from extrapolating the cluster masses beyond the field-of-view used for the gravitational lensing measurements, and from the separation of cluster/background galaxies, contributing each with a scatter of 20%. Taking this into account, there is still significant intrinsic scatter in the mass-temperature relation indicating that this relation may not be very tight, at least at the high mass end. Furthermore, we find that dynamically relaxed clusters are 75 +/-40% hotter than non-relaxed clusters.

8 pages, 4 figures, revised version submitted to ApJ

References in corpus (3)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• The X-Ray Luminosity--Mass Relation for Local Clusters of Galaxies
• The Cluster Mass Function from Weak Gravitational Lensing

Cited by in corpus (10)

• LoCuSS: Comparison of Observed X-ray and Lensing Galaxy Cluster Scaling Relations with Simulations
• Evidence for Non-Hydrostatic Gas from the Cluster X-ray to Lensing Mass Ratio
• An Optical Catalog of Galaxy Clusters Obtained from an Adaptive Matched Filter Finder Applied to SDSS DR6
• CoMaLit III. Literature Catalogs of weak Lensing Clusters of galaxies (LC^2)
• Improved optical mass tracer for galaxy clusters calibrated using weak lensing measurements
• Cosmological Systematics Beyond Nuisance Parameters : Form Filling Functions
• An X-ray selected catalog of extended galaxy clusters from the ROSAT All-Sky Survey (RXGCC)
• Abell 611. II. X-ray and strong lensing analyses
• The hydrostatic-to-lensing mass bias from resolved X-ray and optical-IR data
• Galaxy Cluster Mass Estimation Through The Splashback Radius