Cluster gas fraction as a test of gravity
文献类型：期刊论文
| 作者 | Li, Baojiu1; He, Jian-hua1,2; Gao, Liang1,3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2016-02-11 |
| 卷号 | 456期号:1页码:146-155 |
| 关键词 | methods analytical-methods statistical-galaxies haloes-cosmological parameters-dark matter-large-scale structure of Universe |
| 英文摘要 | We propose a new cosmological test of gravity, by using the observed mass fraction of X-ray-emitting gas in massive galaxy clusters. The cluster gas fraction, believed to be a fair sample of the average baryon fraction in the Universe, is a well-understood observable, which has previously mainly been used to constrain background cosmology. In some modified gravity models, such as f(R) gravity, gas temperature in a massive cluster is determined by the effective mass (the mass that would have produced the same gravitational effect assuming standard gravity as the cluster actually does in f(R) gravity) of that cluster, which can be larger than its true mass. On the other hand, X-ray luminosity is determined by the true gas density, which in both modified gravity and A-cold-dark-matter models depends mainly on ohm(b)/ohm(m) and hence the true total cluster mass. As a result, the standard practice of combining gas temperatures and X-ray surface brightnesses of clusters to infer their gas fractions can, in modified gravity models, lead to a larger - in f(R) gravity this can be 1/3 larger - value of ohm(b)/ohm(m) than that inferred from other observations such as the cosmic microwave background. Our quick calculation shows that the Hu-Sawicki n = 1 f(R) model with | fR0 | = 5 x 10(- 5) is in tension with the gas fraction data of the 42 clusters analysed by Allen et al. We also discuss the implications for other modified gravity models. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000368010000043 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5482]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Univ Durham, Inst Computat Cosmol, Dept Phys, Durham DH1 3LE, England 2.INAF, Astron Observ, I-23807 Merate, LC, Italy 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Baojiu,He, Jian-hua,Gao, Liang. Cluster gas fraction as a test of gravity[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,456(1):146-155. |
| APA | Li, Baojiu,He, Jian-hua,&Gao, Liang.(2016).Cluster gas fraction as a test of gravity.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,456(1),146-155. |
| MLA | Li, Baojiu,et al."Cluster gas fraction as a test of gravity".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 456.1(2016):146-155. |
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来源：国家天文台
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