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The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models
Li,Rui1,2,3,4; Wang,Jiancheng1,2,3,4; Shu,Yiping5,6; Xu,Zhaoyi1,2,3,4
2018-03-08
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume855Issue:1
AbstractAbstract 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-Lyα 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 1σ 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.
Keywordgalaxies: elliptical and lenticular, cD galaxies: halos galaxies: kinematics and dynamics gravitational lensing: strong
DOI10.3847/1538-4357/aaab50
Language英语
WOS IDIOP:0004-637X-855-1-aaab50
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21616
Collection中国科学院紫金山天文台
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China lirui@ynao.ac.cn, jcwang@ynao.ac.cn
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; yiping.shu@pmo.ac.cn
Recommended Citation
GB/T 7714
Li,Rui,Wang,Jiancheng,Shu,Yiping,et al. The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models[J]. The Astrophysical Journal,2018,855(1).
APA Li,Rui,Wang,Jiancheng,Shu,Yiping,&Xu,Zhaoyi.(2018).The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models.The Astrophysical Journal,855(1).
MLA Li,Rui,et al."The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models".The Astrophysical Journal 855.1(2018).
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