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http://hdl.handle.net/20.500.12386/31193
Title: | Helium abundance (and $H_0$) in X-COP galaxy clusters | Authors: | ETTORI, STEFANO Ghirardini, V. Eckert, D. |
Issue Date: | 2020 | Journal: | ASTRONOMISCHE NACHRICHTEN | Number: | 341 | Issue: | 2 | First Page: | 210 | Abstract: | We present the constraints on the helium abundance in 12 X-ray luminous galaxy clusters that have been mapped in their X-ray and Sunyaev-Zeldovich (SZ) signals out to $R_{200}$ for the XMM-Newton Cluster Outskirts Project (X-COP). The unprecedented precision available for the estimate of $H_0$ allows us to investigate how much the reconstructed X-ray and SZ signals are consistent with the expected ratio $x$ between helium and proton densities of 0.08-0.1. We find that a $H_0$ around 70 km/s/Mpc is preferred from our measurements, with lower values of $H_0$ as requested from the Planck collaboration (67 km/s/Mpc) requiring a 34% higher value of $x$. On the other hand, higher values of $H_0$, as obtained by measurements in the local universe, impose $x$, from the primordial nucleosynthesis calculations and current solar abundances, reduced by 37--44\%. | URI: | http://hdl.handle.net/20.500.12386/31193 | URL: | https://onlinelibrary.wiley.com/doi/10.1002/asna.202023780 http://arxiv.org/abs/1911.05039v2 |
ISSN: | 0004-6337 | DOI: | 10.1002/asna.202023780 | Bibcode ADS: | 2020AN....341..210E | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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1911.05039.pdf | preprint | 285.68 kB | Adobe PDF | View/Open |
asna.202023780-1.pdf | [Administrators only] | 720.58 kB | Adobe PDF |
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