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Offset between dark matter and ordinary matter: evidence from a sample of 38 lensing clusters of galaxies
Shan, HuanYuan1,2; Qin, Bo1; Fort, Bernard3; Tao, Charling4; Wu, Xiang-Ping1; Zhao, HongSheng1,6,7
2010-08-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号406期号:2页码:1134-1139
摘要We compile a sample of 38 galaxy clusters which have both X-ray and strong lensing observations, and study for each cluster the projected offset between the dominant component of baryonic matter centre (measured by X-rays) and the gravitational centre (measured by strong lensing). Among the total sample, 45 per cent clusters have offsets > 10 arcsec. The > 10 arcsec separations are significant, considering the arcsecond precision in the measurement of the lensing/X-ray centres. This suggests that it might be a common phenomenon in unrelaxed galaxy clusters that gravitational field is separated spatially from the dominant component of baryonic matter. It also has consequences for lensing models of unrelaxed clusters since the gas mass distribution may differ from the dark matter distribution and give perturbations to the modelling. Such offsets can be used as a statistical tool for comparison with the results of Lambda cold dark matter (Lambda CDM) simulations and to test the modified dynamics.
关键词Gravitational Lensing: Strong Dark Matter X-rays: Galaxies: Clusters
DOI10.1111/j.1365-2966.2010.16739.x
收录类别SCI
语种英语
WOS记录号WOS:000280710300032
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7703
专题星系宇宙学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
3.Univ Paris 06, UPMC, UMR7095, Inst Astrophys Paris, F-52425 Paris, France
4.Univ Aix Marseille 2, F-13288 Marseille 9, France
5.CNRS IN2P3 Luminy, Ctr Phys Particules Marseille, F-13288 Marseille 9, France
6.Leiden Univ, NL-2333 CA Leiden, Netherlands
7.Inst Lorentz Theoret Natuurkunde, NL-2333 CA Leiden, Netherlands
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Shan, HuanYuan,Qin, Bo,Fort, Bernard,et al. Offset between dark matter and ordinary matter: evidence from a sample of 38 lensing clusters of galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,406(2):1134-1139.
APA Shan, HuanYuan,Qin, Bo,Fort, Bernard,Tao, Charling,Wu, Xiang-Ping,&Zhao, HongSheng.(2010).Offset between dark matter and ordinary matter: evidence from a sample of 38 lensing clusters of galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,406(2),1134-1139.
MLA Shan, HuanYuan,et al."Offset between dark matter and ordinary matter: evidence from a sample of 38 lensing clusters of galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 406.2(2010):1134-1139.
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