CLASH-X: A Comparison of Lensing and X-ray Techniques for Measuring the Mass Profiles of Galaxy Clusters
Creators: name: Donahue, Megan
name: Voit, G. Mark
name: Mahdavi, Andisheh
name: Umetsu, Keiichi
name: Ettori, Stefano
name: Merten, Julian
name: Postman, Marc
name: Hoffer, Aaron
name: Baldi, Alessandro
name: Coe, Dan
name: Czakon, Nicole
name: Bartelmann, Mattias
name: Benitez, Narciso
name: Bouwens, Rychard
name: Bradley, Larry
name: Broadhurst, Tom
name: Ford, Holland
name: Gastaldello, Fabio
name: Grillo, Claudio
name: Infante, Leopoldo
name: Jouvel, Stephanie
name: Koekemoer, Anton
name: Kelson, Daniel
name: Lahav, Ofer
name: Lemze, Doron
name: Medezinski, Elinor
name: Melchior, Peter
name: Meneghetti, Massimo
name: Molino, Alberto
name: Moustakas, John
name: Moustakas, Leonidas A.
name: Nonino, Mario
name: Rosati, Piero
name: Sayers, Jack
name: Seitz, Stella
name: Van der Wel, Arjen
name: Zheng, Wei
name: Zitrin, Adi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present profiles of temperature (Tx), gas mass, and hydrostatic mass estimated from new and archival X-ray observations of CLASH clusters. We compare measurements derived from XMM and Chandra observations with one another and compare both to gravitational lensing mass profiles derived with CLASH HST and ground-based lensing data. Radial profiles of Chandra and XMM electron density and enclosed gas mass are nearly identical, indicating that differences in hydrostatic masses inferred from X-ray observations arise from differences in Tx measurements. Encouragingly, cluster Txs are consistent with one another at ~100-200 kpc radii but XMM Tx systematically decline relative to Chandra Tx at larger radii. The angular dependence of the discrepancy suggests additional investigation on systematics such as the XMM point spread function correction, vignetting and off-axis responses. We present the CLASH-X mass-profile comparisons in the form of cosmology-independent and redshift-independent circular-velocity profiles. Ratios of Chandra HSE mass profiles to CLASH lensing profiles show no obvious radial dependence in the 0.3-0.8 Mpc range. However, the mean mass biases inferred from the WL and SaWLens data are different. e.g., the weighted-mean value at 0.5 Mpc is <b> = 0.12 for the WL comparison and <b> = -0.11 for the SaWLens comparison. The ratios of XMM HSE mass profiles to CLASH lensing profiles show a pronounced radial dependence in the 0.3-1.0 Mpc range, with a weighted mean mass bias of value rising to <b>~0.3 at ~1 Mpc for the WL comparison and <b> of 0.25 for SaWLens comparison. The enclosed gas mass profiles from both Chandra and XMM rise to a value 1/8 times the total-mass profiles inferred from lensing at 0.5 Mpc and remain constant outside of that radius, suggesting that [8xMgas] profiles may be an excellent proxy for total-mass profiles at &gt;0.5 Mpc in massive galaxy clusters.</b></b></b></b>
description: Accepted to ApJ; 24 pages; scheduled to appear in the Oct 10, 2014 issue. This version corrects the typographical error in the superscripts for Equation (2) to include the square of (r/r_core). The correct version of this equation was used in the analysis