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
相关论文
共 58 条
[11]   Environmental dependence of dark matter halo growth - I. Halo merger rates [J].
Fakhouri, Onsi ;
Ma, Chung-Pei .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2009, 394 (04) :1825-1840
[12]   The relation between gas density and velocity power spectra in galaxy clusters: High-resolution hydrodynamic simulations and the role of conduction [J].
Gaspari, M. ;
Churazov, E. ;
Nagai, D. ;
Lau, E. T. ;
Zhuravleva, I. .
ASTRONOMY & ASTROPHYSICS, 2014, 569
[13]   Constraining turbulence and conduction in the hot ICM through density perturbations [J].
Gaspari, M. ;
Churazov, E. .
ASTRONOMY & ASTROPHYSICS, 2013, 559
[14]   X-ray observations of the galaxy cluster PKS 0745-191: to the virial radius, and beyond [J].
George, M. R. ;
Fabian, A. C. ;
Sanders, J. S. ;
Young, A. J. ;
Russell, H. R. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2009, 395 (02) :657-666
[15]   X-Ray Temperature and Mass Measurements to the Virial Radius of Abell 1413 with Suzaku [J].
Hoshino, Akio ;
Henry, J. Patrick ;
Sato, Kosuke ;
Akamatsu, Hiroki ;
Yokota, Wataru ;
Sasaki, Shin ;
Ishisaki, Yoshitaka ;
Ohashi, Takaya ;
Bautz, Marshall ;
Fukazawa, Yasushi ;
Kawano, Naomi ;
Furuzawa, Akihiro ;
Hayashida, Kiyoshi ;
Tawa, Noriaki ;
Hughes, John P. ;
Kokubun, Motohide ;
Tamura, Takayuki .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2010, 62 (02) :371-389
[16]   EVOLUTION AND CLUSTERING OF RICH CLUSTERS [J].
KAISER, N .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1986, 222 (02) :323-345
[17]   SUZAKU OBSERVATION OF A1689: ANISOTROPIC TEMPERATURE AND ENTROPY DISTRIBUTIONS ASSOCIATED WITH THE LARGE-SCALE STRUCTURE [J].
Kawaharada, Madoka ;
Okabe, Nobuhiro ;
Umetsu, Keiichi ;
Takizawa, Motokazu ;
Matsushita, Kyoko ;
Fukazawa, Yasushi ;
Hamana, Takashi ;
Miyazaki, Satoshi ;
Nakazawa, Kazuhiro ;
Ohashi, Takaya .
ASTROPHYSICAL JOURNAL, 2010, 714 (01) :423-441
[18]  
Khatri R., 2016, ARXIV160403106
[19]  
Kravtsov A. V., 1999, THESIS
[20]   A new robust low-scatter X-ray mass indicator for clusters of galaxies [J].
Kravtsov, Andrey V. ;
Vikhlinin, Alexey ;
Nagai, Daisuke .
ASTROPHYSICAL JOURNAL, 2006, 650 (01) :128-136
123456