Deriving the Hubble constant using Planck and XMM-Newton observations of galaxy clusters
| Autor: | A. Kozmanyan, Elena Rasia, Mauro Sereno, Hervé Bourdin, Pasquale Mazzotta |
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| Přispěvatelé: | ITA |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Length scale
Galaxies: clusters: intracluster mediums Cosmology and Nongalactic Astrophysics (astro-ph.CO) Galaxies: clusters: General Cosmological parameters FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences symbols.namesake Bayesian networks Uncertainty analysis X rays Cosmological parameters Distance scale X rays: galaxies: clusters Galaxies Intracluster medium 0103 physical sciences Cluster (physics) Planck 010303 astronomy & astrophysics Galaxy cluster Physics X rays 010308 nuclear & particles physics Settore FIS/05 Astronomy and Astrophysics Galaxies Redshift Amplitude Space and Planetary Science X rays: galaxies: clusters symbols Hubble's law Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | The possibility of determining the value of the Hubble constant using observations of galaxy clusters in X-ray and microwave wavelengths through the Sunyaev Zeldovich (SZ) effect has long been known. Previous measurements have been plagued by relatively large errors in the observational data and severe biases induced, for example, by cluster triaxiality and clumpiness. The advent of \textit{Planck} allows us to map the Compton parameter y, that is, the amplitude of the SZ effect, with unprecedented accuracy at intermediate cluster-centric radii, which in turn allows performing a detailed spatially resolved comparison with X-ray measurements. Given such higher quality observational data, we developed a Bayesian approach that combines informed priors on the physics of the intracluster medium obtained from hydrodynamical simulations of massive clusters with measurement uncertainties. We apply our method to a sample of 61 galaxy clusters with redshifts up to z < 0.5 observed with Planck and XMM-Newton observations and find H_0=67 \pm 3 km s^{-1} Mpc^{-1}. 15 pages, 9 figures, accepted for publication by A&A |
| Databáze: | OpenAIRE |
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