CLASH-X: A COMPARISON OF LENSING AND X-RAY TECHNIQUES FOR MEASURING THE MASS PROFILES OF GALAXY CLUSTERS

Titulo: 
CLASH-X: A COMPARISON OF LENSING AND X-RAY TECHNIQUES FOR MEASURING THE MASS PROFILES OF GALAXY CLUSTERS
Autores: 
Donahue, M; Voit, GM; Mahdavi, A; Umetsu, K; Ettori, S; Merten, J; Postman, M; Hoffer, A; Baldi, A; Coe, D; Czakon, N; Bartelmann, M; Benitez, N; Bouwens, R; Bradley, L; Broadhurst, T; Ford, H; Gastaldello, F; Grillo, C; Infante, L; Jouvel, S; Koekemoer, A; Kelson, D; Lahav, O; Lemze, D; Medezinski, E; Melchior, P; Meneghetti, M; Molino, A; Moustakas, J; Moustakas, LA; Nonino, M; Rosati, P; Sayers, J; Seitz, S; Van der Wel, A; Zheng, W; Zitrin, A
Resumen: 
We present profiles of temperature, gas mass, and hydrostatic mass estimated from new and archival X-ray observations ofCLASHclusters. We comparemeasurements derived fromXMMand Chandra observations with one another and compare both to gravitational lensing mass profiles derived with CLASH Hubble Space Telescope and Subaru Telescope lensing data. Radial profiles of Chandra andXMMmeasurements of electron density and enclosed gasmass are nearly identical, indicating that differences in hydrostatic masses inferred fromX-ray observations arise from differences in gas-temperature measurements. Encouragingly, gas temperatures measured in clusters by XMM and Chandra are consistent with one another at similar to 100-200 kpc radii, but XMM temperatures systematically decline relative to Chandra temperatures at larger radii. The angular dependence of the discrepancy suggests that additional investigation on systematics such as the XMM point-spread function correction, vignetting, and off-axis responses is yet required. We present the CLASH-X mass-profile comparisons in the form of cosmology-independent and redshift-independent circular-velocity profiles. We argue that comparisons of circular-velocity profiles are the most robust way to assess mass bias. Ratios of Chandra hydrostatic equilibrium (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 weak-lensing (WL) and SaWLens data are different. As an example, 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 value rising to < b > greater than or similar to 0.3 at similar to 1 Mpc for the WL comparison and < b > approximate to 0.25 for the SaWLens comparison. The enclosed gas mass profiles from both Chandra and XMM rise to a value approximate to 1/8 times the total-mass profiles inferred from lensing at approximate to 0.5 Mpc and remain constant outside of that radius, suggesting that M-gas x 8 profiles may be an excellent proxy for total-mass profiles at greater than or similar to 0.5 Mpc in massive galaxy clusters.
Autor principal: 
Donahue, M
Autor/es del IAA: 
Benitez, Narciso
DOI: 
10.1088/0004-637X/794/2/136
Revista: 
ASTROPHYSICAL JOURNAL
Fecha de publicación: 
2014/10/20
Volumen: 
794
Issue: 
2
Tipo de documento: 
Article
Palabras clave: 
cosmological parameters; dark matter; galaxies: clusters: intracluster medium; gravitational lensing: strong; gravitational lensing: weak; X-rays: galaxies: clusters
Número de artículo: 
136