STIRRED, NOT CLUMPED: EVOLUTION OF TEMPERATURE PROFILES IN THE OUTSKIRTS OF GALAXY CLUSTERS

被引：14
作者：
Avestruz, Camille [1 ,2 ,3 ,4 ,5 ,6 ]
Nagai, Daisuke [1 ,2 ]
Lau, Erwan T. [1 ,2 ]
机构：
[1] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[2] Yale Univ, Yale Ctr Astron & Astrophys, New Haven, CT 06520 USA
[3] Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA
[4] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA
[5] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA
[6] Univ Chicago, Chicago, IL 60637 USA
来源：
ASTROPHYSICAL JOURNAL | 2016年 / 833卷 / 02期
基金：
美国国家科学基金会;
关键词：
cosmology: theory; galaxies: clusters: general; galaxies: clusters: intracluster medium; methods: numerical; X-rays: galaxies: clusters; HYDROSTATIC MASS BIAS; LAMBDA-CDM CLUSTERS; DARK-MATTER HALOES; X-RAY; INTRACLUSTER MEDIUM; NONTHERMAL PRESSURE; SUNYAEV-ZELDOVICH; SCALING RELATIONS; NONEQUILIBRIUM ELECTRONS; ANALYTICAL-MODEL;
D O I：
10.3847/1538-4357/833/2/227
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recent statistical X-ray measurements of the intracluster medium (ICM) indicate that gas temperature profiles in the outskirts of galaxy clusters deviate from self-similar evolution. Using a mass-limited sample of galaxy clusters from cosmological hydrodynamical simulations, we show that the departure from self-similarity can be explained by non-thermal gas motions driven by mergers and accretion. Contrary to previous claims, gaseous substructures only play a minor role in the temperature evolution in cluster outskirts. A careful choice of halo overdensity definition in self-similar scaling mitigates these departures. Our work highlights the importance of non-thermal gas motions in ICM evolution and the use of galaxy clusters as cosmological probes.
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页数：9
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