GAS CLUMPING IN THE OUTSKIRTS OF ΛCDM CLUSTERS

被引：158
|
作者：
Nagai, Daisuke [1 ]
Lau, Erwin T. [2 ]
机构：
[1] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[2] Partner Grp MPA, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 731卷 / 01期
基金：
美国国家科学基金会;
关键词：
cosmology: theory; galaxies: clusters: general; methods: numerical; X-rays: galaxies: clusters; X-RAY OBSERVATIONS; GALAXY CLUSTERS; INTRACLUSTER MEDIUM; TEMPERATURE; SIMULATIONS; ENTROPY; CHANDRA; PROFILES; MOTIONS;
D O I：
10.1088/2041-8205/731/1/L10
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recent Suzaku X-ray observations revealed that the observed entropy profile of the intracluster medium (ICM) deviates significantly from the prediction of hydrodynamical simulations of galaxy clusters. In this work, we show that gas clumping introduces significant biases in X-ray measurements of the ICM profiles in the outskirts of galaxy clusters. Using hydrodynamical simulations of galaxy cluster formation in a concordance Lambda CDM model, we demonstrate that gas clumping leads to an overestimate of the observed gas density and causes flattening of the entropy profile. Our results suggest that gas clumping must be taken into account when interpreting X-ray measurements of cluster outskirts.
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页数：5
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