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题名: Cosmic Constraints to the wCDM Model from Strong Gravitational Lensing
作者: An, J ;  Chang, BR ;  Xu, LX
刊名: CHINESE PHYSICS LETTERS
出版日期: 2016
卷号: 33, 期号:7, 页码:79801
学科分类: Physics
DOI: http://dx.doi.org/10.1088/0256-307X/33/7/079801
通讯作者: Xu, LX (reprint author), Dalian Univ Technol, Sch Phys & Optoelect Technol, Inst Theoret Phys, Dalian 116024, Peoples R China. ;  Xu, LX (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
文章类型: Article
英文摘要: We study the cosmic constraint to the wCDM (cold dark matter with a constant equation of state..) model via 118 strong gravitational lensing systems which are compiled from SLACS, BELLS, LSD and SL2S surveys, where the ratio between two angular diameter distances D-obs = D-A(z(l), z(s))/D-A(0, z(s)) is taken as a cosmic observable. To obtain this ratio, we adopt two strong lensing models: one is the singular isothermal sphere model (SIS) and the other one is the power-law density profile (PLP) model. Via the Markov chain Monte Carlo method, the posterior distribution of the cosmological model parameters space is obtained. The results show that the cosmological model parameters are not sensitive to the parameterized forms of the power-law index gamma. Furthermore, the PLP model gives a relatively tighter constraint to the cosmological parameters than that of the SIS model. The predicted value of Omega(m) = 0.31(-0.24)(+0.44) by the SIS model is compatible with that obtained by Planck2015: Omega(m) = 0.313 +/- 0.013. However, the value of Omega(m) = 0.15(-0.11)(+0.13) based on the PLP model is smaller and has 1.25 sigma tension with that obtained by Planck2015.
类目[WOS]: Physics, Multidisciplinary
关键词[WOS]: EARLY-TYPE GALAXIES ;  ALL-SKY SURVEY ;  DARK ENERGY ;  COSMOLOGICAL PARAMETERS ;  STATISTICS ;  EVOLUTION ;  SYSTEMS ;  MASS ;  POPULATIONS ;  REDSHIFT
收录类别: SCI
项目资助者: National Natural Science Foundation of China [11275035]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21605
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
An, J,Chang, BR,Xu, LX. Cosmic Constraints to the wCDM Model from Strong Gravitational Lensing[J]. CHINESE PHYSICS LETTERS,2016,33(7):79801.
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