The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models

doi:10.3847/1538-4357/aaab50

	The Discrepancy between Einstein Mass and Dynamical Mass for SIS and Power-law Mass Models
	Li,Rui 1,2,3,4; Wang,Jiancheng 1,2,3,4; Shu,Yiping 5,6; Xu,Zhaoyi 1,2,3,4
刊名	The Astrophysical Journal
	2018-03-08
卷号	855 期号:1
关键词	galaxies: elliptical and lenticular, cD galaxies: halos galaxies: kinematics and dynamics gravitational lensing: strong
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaab50
英文摘要	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-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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-855-1-AAAB50
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/21615]
专题	中国科学院紫金山天文台
作者单位	1.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
推荐引用方式 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).