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Strong-lensing measurement of the total-mass-density profile out to three effective radii for z similar to 0.5 early-type galaxies
Li R(李瑞)1,2,3,4; Shu, Yiping5,6; Wang JC(王建成)1,2,3,4
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-10-01
卷号480期号:1页码:431-438
DOI10.1093/mnras/sty1813
产权排序第1完成单位
收录类别SCI
关键词Gravitational Lensing: Strong Galaxies: Elliptical And Lenticular, Cd Galaxies: Structure
摘要

We measure the total-mass-density profiles out to three effective radii for a sample of 63 z similar to 0.5, massive early-type galaxies (ETGs) acting as strong gravitational lenses through a joint analysis of lensing and stellar dynamics. The compilation is selected from three galaxy-scale strong-lens samples, namely the Baryon Oscillation Spectroscopic Survey (BOSS) Emission-Line Lens Survey (BELLS), the BELLS for GALaxy-Ly alpha EmitteR sYstems Survey (BELLS GALLERY), and the Strong Lensing Legacy Survey (SL2S). Utilizing the wide source-redshift coverage (0.8-3.5) provided by these three samples, we build a statistically significant ensemble of massive ETGs for which robust mass measurements can be achieved within a broad range of Einstein radii up to three effective radii. Characterizing the three-dimensional total-mass-density distribution by a power-law profile as rho proportional to r(-gamma), we find that the average logarithmic density slope for the entire sample is = 2.000(-0.032)(+0.033) (68 per cent CL) with an intrinsic scatter of delta = 0.180(-0.028)(+0.032). Further parametrizing gamma as a function of redshift z and the ratio of Einstein radius to effective radius R-ein/R-eff, we find that the average density distributions of these massive ETGs become steeper at later cosmic times and at larger radii, with magnitudes d /dz = -0.309(-0.160)(+0.166) and d /d log(10)(R-ein/R-eff) = 0.194(-0.083)(+0.092).

资助项目National Natural Science Foundation of China[11573060] ; National Natural Science Foundation of China[11661161010] ; 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]
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OXFORD UNIV PRESS
ISSN0035-8711
URL查看原文
WOS记录号WOS:000442567900034
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Dark-matter Haloes ; Illustris Simulation ; Acs Survey ; Black-holes ; Cosmic Time ; Evolution ; Z-approximate-to-1 ; Dynamics ; Project ; Stellar
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17868
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); Shu, Yiping; Wang JC(王建成)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China
2.University of Chinese Academy of Sciences, Beijing,100049, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China
5.Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing, Jiangsu 210008, China
6.Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
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GB/T 7714
Li R,Shu, Yiping,Wang JC. Strong-lensing measurement of the total-mass-density profile out to three effective radii for z similar to 0.5 early-type galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,480(1):431-438.
APA Li R,Shu, Yiping,&Wang JC.(2018).Strong-lensing measurement of the total-mass-density profile out to three effective radii for z similar to 0.5 early-type galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,480(1),431-438.
MLA Li R,et al."Strong-lensing measurement of the total-mass-density profile out to three effective radii for z similar to 0.5 early-type galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 480.1(2018):431-438.
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