Resolving the hydrostatic mass profiles of galaxy clusters at z~1 with XMM-Newton and Chandra
| Autor: | Bartalucci, Iacopo, Arnaud, Monique, Pratt, Gabriel W., Brun, Amandine M. C. Le |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | A&A 617, A64 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/201732458 |
| Popis: | We present a detailed study of the integrated total hydrostatic mass profiles of the five most massive ($M^{\mathrm{SZ}}_{500} > 5 \times 10^{14}$ M$_{\odot}$) galaxy clusters selected at $z\sim1$ via the Sunyaev-Zel'dovich effect. These objects represent an ideal laboratory to test structure formation models where the primary driver is gravity. Optimally exploiting spatially-resolved spectroscopic information from XMM-Newton and Chandra observations, we used both parametric (forward, backward) and non-parametric methods to recover the mass profiles, finding that the results are extremely robust when density and temperature measurements are both available. Our X-ray masses at $R_{500}$ are higher than the weak lensing masses obtained from the Hubble Space Telescope (HST), with a mean ratio of $1.39^{+0.47}_{-0.35}$. This offset goes in the opposite direction to that expected in a scenario where the hydrostatic method yields a biased, underestimated, mass. We investigated halo shape parameters such as sparsity and concentration, and compared to local X-ray selected clusters, finding hints for evolution in the central regions (or for selection effects). The total baryonic content is in agreement with the cosmic value at $R_{500}$. Comparison with numerical simulations shows that the mass distribution and concentration are in line with expectations. These results illustrate the power of X-ray observations to probe the statistical properties of the gas and total mass profiles in this high-mass, high-redshift regime. Comment: Accepted for publication in A&A |
| Databáze: | arXiv |
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