Dark matter distribution in X-ray luminous galaxy clusters with Emergent Gravity

被引：15
作者：
Ettori, S. [1 ,2 ]
Ghirardini, V. [1 ,3 ]
Eckert, D. [4 ]
Dubath, F. [4 ]
Pointecouteau, E. [5 ,6 ]
机构：
[1] INAF, Osservatorio Astron Bologna, Via Pietro Gobetti 93-3, I-40129 Bologna, Italy
[2] INAF, Sez Bologna, Viale Berti Pichat 6-2, I-40127 Bologna, Italy
[3] Univ Bologna, Dipartimento Fis & Astron, Via Pietro Gobetti 93-2, I-40129 Bologna, Italy
[4] Univ Geneva, Dept Astron, Ch Ec 16, CH-1290 Versoix, Switzerland
[5] CNRS, IRAP, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France
[6] Univ Toulouse, IRAP, UPS OMP, F-31028 Toulouse, France
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 470卷 / 01期
基金：
欧盟地平线“2020”;
关键词：
galaxies: clusters: individual: Abell 2142; galaxies: clusters: individual: Abell 2319; galaxies: clusters: intracluster medium; dark matter; X-rays: galaxies: clusters; HYDROSTATIC EQUILIBRIUM; MASS PROFILES; SAMPLE; NEWTON; II;
D O I：
10.1093/mnrasl/slx074
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the radial distribution of the dark matter in two massive, X-ray luminous galaxy clusters, Abell 2142 and Abell 2319, and compare it with the quantity predicted as apparent manifestation of the baryonic mass in the context of the 'Emergent Gravity' scenario, recently suggested from Verlinde. Thanks to the observational strategy of the XMM-Newton Cluster Outskirt Programme (X-COP), using the X-ray emission mapped with XMM-Newton and the Sunyaev-Zel'dovich signal in the Planck survey, we recover the gas density, temperature and thermal pressure profiles up to similar to R-200, allowing us to constrain at an unprecedented level the total mass through the hydrostatic equilibrium equation. We show that, also including systematic uncertainties related to the X-ray-based mass modelling, the apparent 'dark' matter shows a radial profile that has a shape different from the traditional dark matter distribution, with larger discrepancies (by a factor of 2-3) in the inner (r < 200 kpc) cluster's regions and a remarkable agreement only across R-500.
引用
收藏
页码：L29 / L33
页数：5
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