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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
Source PublicationASTROPHYSICAL JOURNAL
2018-03-01
Volume855Issue:1
DOI10.3847/1538-4357/aaab50
Contribution Rank第1完成单位
Indexed BySCI
KeywordGalaxies: Halos Galaxies: Kinematics And Dynamics Gravitational Lensing: Strong Galaxies: Elliptical And Lenticular Cd
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[11573060] ; National Natural Science Foundation of China[116611 61010] ; National Natural Science Foundation of China[11603032] ; National Natural Science Foundation of China[11333008] ; 973 program[2015CB857003] ; Royal Society - K.C. Wong International Fellowship[NF170995]
Funding OrganizationNational Natural Science Foundation of China[11573060, 116611 61010, 11603032, 11333008] ; 973 program[2015CB857003] ; Royal Society - K.C. Wong International Fellowship[NF170995]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000440283300005
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordEarly-type Galaxies ; Lens Acs Survey ; Swells Survey ; 2-dimensional Kinematics ; Slacs Lenses ; Dark-matter ; Stellar ; Z-approximate-to-1 ; Environments ; Evolution
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17385
Collection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
Corresponding AuthorLi R(李瑞); Wang JC(王建成); Shu, Yiping
Affiliation1.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.
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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