TY - JOUR
T1 - LoCuSS
T2 - Hydrostatic mass measurements of the high-LX cluster sample - cross-calibration of Chandra and XMM-Newton
AU - Martino, Rossella
AU - Mazzotta, Pasquale
AU - Bourdin, Hervé
AU - Smith, Graham P.
AU - Bartalucci, Iacopo
AU - Marrone, Daniel P.
AU - Finoguenov, Alexis
AU - Okabe, Nobuhiro
PY - 2014/9
Y1 - 2014/9
N2 - 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-LX 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 per cent precision, respectively. To verify the crosscalibration 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 data sets.We obtain consistent results for the gas and total hydrostatic clustermasses: the average ratio of Chandrato XMM-Newton-based measurements of Mgas and MX at r500 are 0.99 ± 0.02 and 1.02 ± 0.05, respectively, with an intrinsic scatter of ~3 per cent for gas masses and ~8 per cent for hydrostatic masses. Comparison of our hydrostatic mass measurements at r500 with the latest Local Cluster Substructure Survey (LoCuSS) weak-lensing results indicate that the data are consistent with non-thermal pressure support at this radius of ~7 per cent.We also investigate the scaling relation between our hydrostatic cluster masses and published integrated Compton parameter Ysph measurements from the Sunyaev-Zel'dovich Array. We measure a scatter in mass at fixed Ysph of ~16 per cent at Δ = 500, which is consistent with theoretical predictions of ~10-15 per cent scatter.
AB - 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-LX 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 per cent precision, respectively. To verify the crosscalibration 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 data sets.We obtain consistent results for the gas and total hydrostatic clustermasses: the average ratio of Chandrato XMM-Newton-based measurements of Mgas and MX at r500 are 0.99 ± 0.02 and 1.02 ± 0.05, respectively, with an intrinsic scatter of ~3 per cent for gas masses and ~8 per cent for hydrostatic masses. Comparison of our hydrostatic mass measurements at r500 with the latest Local Cluster Substructure Survey (LoCuSS) weak-lensing results indicate that the data are consistent with non-thermal pressure support at this radius of ~7 per cent.We also investigate the scaling relation between our hydrostatic cluster masses and published integrated Compton parameter Ysph measurements from the Sunyaev-Zel'dovich Array. We measure a scatter in mass at fixed Ysph of ~16 per cent at Δ = 500, which is consistent with theoretical predictions of ~10-15 per cent scatter.
KW - Cosmology: observations
KW - Galaxies: clusters: general
KW - X-rays: galaxies: clusters
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U2 - 10.1093/mnras/stu1267
DO - 10.1093/mnras/stu1267
M3 - Article
AN - SCOPUS:84906063665
VL - 443
SP - 2342
EP - 2360
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 3
ER -