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Zhang, Qing-Jun; Cheng, Ling-Mei; Wu, Yue-Liang; Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China | |
CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES | |
Source Publication | ASTROPHYSICAL JOURNAL |
Keyword | Universal Density Profile All-sky Survey Cosmological Consequences Matter Halos Models Component Parameters Supernovae Evolution Abundance |
Abstract | Utilizing the CLASS statistical sample, we investigate the constraint of the splitting angle statistic of strong gravitational lenses (SGL) on the equation-of-state parameter w = p/rho of the dark energy in the flat cold dark matter (CDM) cosmology. Through the comoving number density of dark halos described by the Press-Schechter theory, dark energy affects the efficiency with which dark-matter concentrations produce strong lensing signals. The constraints on both constant w and time-varying w(z) = w(0) + w(a)z/(1 + z) from the SGL splitting angle statistic are consistently obtained by adopting a two-model combined mechanism of a dark halo density profile matched at the mass scale M(c). Our main observations are that (1) the resulting model parameter M(c) is found to be M(c) similar to 1.4 for both constant w and time-varying w(z), which is larger than M(c) similar to 1 obtained in literatures; (2) the fitting results for the constant w are found to be w = -0.89(-0.26)(+0.49) and w = -0.94(-0.16)(+0.57) for the source redshift distributions of the Gaussian models g(z(s)) and g(c)(z(s)), respectively, which are consistent with the Lambda CDM at 95% C.L.; (3) the time-varying w(z) is found to be sigma(8) = 0.74: (M(c); w(0), w(a)) = (1.36; -0.92, -1.31) and (M(c); w(0), w(a)) = (1.38;-0.89, -1.21) for g(z(s)) and g(c)(z(s)), respectively; the influence of sigma(8) is investigated and found to be sizable for sigma(8) = 0.74-0.90. After marginalizing the likelihood functions over the cosmological parameters (Omega(M), h, sigma(8)) and the model parameter Mc, we find that the data of SGL splitting angle statistic lead to the best-fit results (w(0), w(a)) =(-0.88(-1.03)(+0.65),-1.55(-1.88)(+1.77)) and (w(0), w(a)) = (-0.91(-1.46)(+0.60),- 1.60(-2.57)+(1.60)) for g(z(s)) and g(c)(z(s)), respectively. |
2009 | |
ISSN | 0004-637X |
Volume | 694Issue:2Pages:1402-1412 |
Subject Area | Physics |
Indexed By | SCI |
Funding Organization | National Science Foundation of China (NSFC)[10821504, 10475105, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10475105, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10475105, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10475105, 10491306]; Chinese Academy of Science |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.itp.ac.cn/handle/311006/5351 |
Collection | 理论物理所科研产出_SCI论文 |
Corresponding Author | Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China |
Recommended Citation GB/T 7714 | Zhang, Qing-Jun,Cheng, Ling-Mei,Wu, Yue-Liang,et al. CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES[J]. ASTROPHYSICAL JOURNAL,2009,694(2):1402-1412. |
APA | Zhang, Qing-Jun,Cheng, Ling-Mei,Wu, Yue-Liang,&Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China.(2009).CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES.ASTROPHYSICAL JOURNAL,694(2),1402-1412. |
MLA | Zhang, Qing-Jun,et al."CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES".ASTROPHYSICAL JOURNAL 694.2(2009):1402-1412. |
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