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The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models
Li R(李瑞)1,2,3,4; Wang JC(王建成)1,2,3,4; Shu, Yiping5,6,7; Xu ZY(俆兆意)1,2,3,4
发表期刊ASTROPHYSICAL JOURNAL
2018-03-01
卷号855期号:1
DOI10.3847/1538-4357/aaab50
产权排序第1完成单位
收录类别SCI
关键词Galaxies: Halos Galaxies: Kinematics And Dynamics Gravitational Lensing: Strong Galaxies: Elliptical And Lenticular Cd
摘要

We investigate the discrepancy between the two-dimensional projected lensing mass and the dynamical mass for an ensemble of 97 strong gravitational lensing systems discovered by the Sloan Lens ACS Survey, the BOSS Emission-Line Lens Survey (BELLS), and the BELLS for GALaxy-Ly alpha EmitteR sYstems Survey. We fit the lensing data to obtain the Einstein mass and use the velocity dispersion of the lensing galaxies provided by the Sloan Digital Sky Survey to get the projected dynamical mass within the Einstein radius by assuming the power-law mass approximation. The discrepancy is found to be obvious and quantified by Bayesian analysis. For the singular isothermal sphere mass model, we obtain that the Einstein mass is 20.7% more than the dynamical mass, and the discrepancy increases with the redshift of the lensing galaxies. For the more general power-law mass model, the discrepancy still exists within a 1 sigma credible region. We suspect the main reason for this discrepancy is mass contamination, including all invisible masses along the line of sight. In addition, the measurement errors and the approximation of the mass models could also contribute to the discrepancy.

项目资助者National Natural Science Foundation of China(11573060, 116611 61010, 11603032, 11333008) ; 973 program(2015CB857003) ; Royal Society - K.C. Wong International Fellowship(NF170995)
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
ISSN0004-637X
URL查看原文
WOS记录号WOS:000440283300005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Early-type Galaxies ; Lens Acs Survey ; Swells Survey ; 2-dimensional Kinematics ; Slacs Lenses ; Dark-matter ; Stellar ; Z-approximate-to-1 ; Environments ; Evolution
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17385
专题高能天体物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Li R(李瑞); Wang JC(王建成); Shu, Yiping
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China
2.University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China
5.Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing 210008, People's Republic of China
6.Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
7.Royal Society - K. C. Wong International Fellow.
推荐引用方式
GB/T 7714
Li R,Wang JC,Shu, Yiping,et al. The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models[J]. ASTROPHYSICAL JOURNAL,2018,855(1).
APA Li R,Wang JC,Shu, Yiping,&Xu ZY.(2018).The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models.ASTROPHYSICAL JOURNAL,855(1).
MLA Li R,et al."The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models".ASTROPHYSICAL JOURNAL 855.1(2018).
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