TY - JOUR
T1 - Clash-X
T2 - A comparison of lensing and X-ray techniques for measuring the mass profiles of galaxy clusters
AU - Donahue, Megan
AU - Voit, G. Mark
AU - Mahdavi, Andisheh
AU - Umetsu, Keiichi
AU - Ettori, Stefano
AU - Merten, Julian
AU - Postman, Marc
AU - Hoffer, Aaron
AU - Baldi, Alessandro
AU - Coe, Dan
AU - Czakon, Nicole
AU - Bartelmann, Mattias
AU - Benitez, Narciso
AU - Bouwens, Rychard
AU - Bradley, Larry
AU - Broadhurst, Tom
AU - Ford, Holland
AU - Gastaldello, Fabio
AU - Grillo, Claudio
AU - Infante, Leopoldo
AU - Jouvel, Stephanie
AU - Koekemoer, Anton
AU - Kelson, Daniel
AU - Lahav, Ofer
AU - Lemze, Doron
AU - Medezinski, Elinor
AU - Melchior, Peter
AU - Meneghetti, Massimo
AU - Molino, Alberto
AU - Moustakas, John
AU - Moustakas, Leonidas A.
AU - Nonino, Mario
AU - Rosati, Piero
AU - Sayers, Jack
AU - Seitz, Stella
AU - Van Der Wel, Arjen
AU - Zheng, Wei
AU - Zitrin, Adi
N1 - Publisher Copyright:
© 2014. The American Astronomical Society. All rights reserved..
PY - 2014/10/20
Y1 - 2014/10/20
N2 - We present profiles of temperature, 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 Hubble Space Telescope and Subaru Telescope lensing data. Radial profiles of Chandra and XMM measurements of electron density and enclosed gas mass are nearly identical, indicating that differences in hydrostatic masses inferred from X-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 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〉 ≳ 0.3 at 1 Mpc for the WL comparison and 〈b〉 0.25 for the 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 M gas × 8 profiles may be an excellent proxy for total-mass profiles at ≳ 0.5 Mpc in massive galaxy clusters.
AB - We present profiles of temperature, 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 Hubble Space Telescope and Subaru Telescope lensing data. Radial profiles of Chandra and XMM measurements of electron density and enclosed gas mass are nearly identical, indicating that differences in hydrostatic masses inferred from X-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 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〉 ≳ 0.3 at 1 Mpc for the WL comparison and 〈b〉 0.25 for the 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 M gas × 8 profiles may be an excellent proxy for total-mass profiles at ≳ 0.5 Mpc in massive galaxy clusters.
KW - X-rays: galaxies: clusters
KW - cosmological parameters
KW - dark matter
KW - galaxies: clusters: intracluster medium
KW - gravitational lensing: strong
KW - gravitational lensing: weak
UR - http://www.scopus.com/inward/record.url?scp=84907701546&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/794/2/136
DO - 10.1088/0004-637X/794/2/136
M3 - Article
AN - SCOPUS:84907701546
SN - 0004-637X
VL - 794
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 136
ER -