LoCuSS: Hydrostatic mass measurements of the high-LX cluster sample - cross-calibration of Chandra and XMM-Newton

Rossella Martino, Pasquale Mazzotta, Hervé Bourdin, Graham P. Smith, Iacopo Bartalucci, Daniel P. Marrone, Alexis Finoguenov, Nobuhiro Okabe

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2342-2360
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Sep 2014


  • Cosmology: observations
  • Galaxies: clusters: general
  • X-rays: galaxies: clusters

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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