LoCuSS: Hydrostatic Mass Measurements of the High-$L_X$ Cluster Sample -- Cross-calibration of Chandra and XMM-Newton

Abstract

We present a consistent analysis of Chandra and XMM-Newton observations of an approximately mass-selected sample of 50 galaxy clusters at $0.15<z<0.3$ -- the "LoCuSS High-$L_X$ Sample". We apply the same analysis methods to data from both satellites, including newly developed analytic background models that predict the spatial variation of the Chandra and XMM-Newton backgrounds to $<2\%$ and $<5\%$ precision respectively. To verify the cross-calibration of Chandra and XMM-Newton-based cluster mass measurements, we derive the mass profiles of the 21 clusters that have been observed with both satellites, extracting surface brightness and temperature profiles from identical regions of the respective datasets. We obtain consistent results for the gas and total hydrostatic cluster masses: the average ratio of Chandra- to XMM-Newton-based measurements of $M_{\mathrm{gas}}$ and $M_X$ at $r_{500}$ are $0.99\pm 0.02$ and $1.02\pm 0.05$, respectively with an intrinsic scatter of $\sim 3\%$ for gas masses and $\sim 8\%$ for hydrostatic masses. Comparison of our hydrostatic mass measurements at $r_{500}$ with the latest LoCuSS weak-lensing results indicate that the data are consistent with non-thermal pressure support at this radius of $\sim 7\%$. We also investigate the scaling relation between our hydrostatic cluster masses and published integrated Compton parameter $Y_{sph}$ measurements from the Sunyaev-Zel'dovich Array. We measure a scatter in mass at fixed $Y_{sph}$ of $\sim 16\%$ at $\Delta =500$, which is consistent with theoretical predictions of $\sim 10-15\%$ scatter.

21 pages, 11 figures

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Cited by in corpus (10)

• LoCuSS: The slow quenching of star formation in cluster galaxies and the need for pre-processing
• XMM-Newton and Chandra Cross Calibration Using HIFLUGCS Galaxy Clusters: Systematic Temperature Differences and Cosmological Impact
• Cosmology and Astrophysics from Relaxed Galaxy Clusters I: Sample Selection
• The mass-concentration relation in lensing clusters: the role of statistical biases and selection effects
• Resolving galaxy cluster gas properties at z~1 with XMM-Newton and Chandra
• The galaxy cluster outskirts probed by Chandra
• Reconciling Planck cluster counts and cosmology? Chandra/XMM instrumental calibration and hydrostatic mass bias
• Recovering galaxy cluster gas density profiles with XMM-Newton and Chandra
• Pressure profiles of distant galaxy clusters in the Planck catalog
• Galaxy cluster luminosities and colours, and their dependence on cluster mass and merger state