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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, Rui1,2,3,4; Shu, Yiping5,6; Wang, Jiancheng1,2,3,4
2018-10-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume480Issue:1Pages:431-438
Abstract

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).

Keywordgravitational lensing: strong galaxies: elliptical and lenticular, cD galaxies: structure
DOI10.1093/mnras/sty1813
WOS KeywordDARK-MATTER HALOES ; ILLUSTRIS SIMULATION ; ACS SURVEY ; BLACK-HOLES ; COSMIC TIME ; EVOLUTION ; Z-APPROXIMATE-TO-1 ; DYNAMICS ; PROJECT ; STELLAR
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000442567900034
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21523
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Rui; Shu, Yiping; Wang, Jiancheng
Affiliation1.Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China
4.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
5.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
6.Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England
Recommended Citation
GB/T 7714
Li, Rui,Shu, Yiping,Wang, Jiancheng. 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, Rui,Shu, Yiping,&Wang, Jiancheng.(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, Rui,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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