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Abstract
We compare X-ray and caustic mass profiles for a sample of 16 massive galaxy clusters. We assume hydrostatic equilibrium in interpreting the X-ray data, and use large samples of cluster members with redshifts as a basis for applying the caustic technique. The hydrostatic and caustic masses agree to better than ≈20% on average across the radial range covered by both techniques (~[0.2-1.25]R500). The mass profiles were measured independently and do not assume a common functional form. Previous studies suggest that, at R500, the hydrostatic and caustic masses are biased low and high respectively. We find that the ratio of hydrostatic to caustic mass at R500 is 1.20 +0.13 -0.11; thus it is larger than 0.9 at ≈3σ and the combination of under- and over-estimation of the mass by these two techniques is ≈10% at most. There is no indication of any dependence of the mass ratio on the X-ray morphology of the clusters, indicating that the hydrostatic masses are not strongly systematically affected by the dynamical state of the clusters. Overall, our results favour a small value of the so-called hydrostatic bias due to non-thermal pressure sources.
Original language | English |
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Pages (from-to) | 4182-4191 |
Number of pages | 10 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 461 |
Issue number | 4 |
Early online date | 7 Jul 2016 |
DOIs | |
Publication status | Published - 1 Oct 2016 |
Bibliographical note
10 pages (including appendix), 6 figures. MNRAS in pressKeywords
- astro-ph.CO
- galaxies: clusters: general
- galaxies: kinematics and dynamics
- cosmology: observations
- X-rays: galaxies: clusters
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Dive into the research topics of 'Hydrostatic and Caustic Mass Profiles of Galaxy Clusters'. Together they form a unique fingerprint.Projects
- 2 Finished
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Research in planetary formation, astrophysics, and cosmology at Bristol
Birkinshaw, M. (Principal Investigator)
1/04/15 → 31/03/18
Project: Research
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Research in planetary physics, astrophysics and cosmology at Bristol
Birkinshaw, M. (Principal Investigator)
1/04/12 → 1/04/15
Project: Research