On the effects of line-of-sight structures on lensing flux-ratio anomalies in a Lambda CDM universe
文献类型：期刊论文
| 作者 | Xu, D. D.1,2; Mao, Shude1,3 ; Cooper, Andrew P.4; Gao, Liang1; Frenk, Carlos S.5; Angulo, Raul E.4; Helly, John5
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2012-04-01 |
| 卷号 | 421期号:3页码:2553-2567 |
| 关键词 | gravitational lensing: strong galaxies: haloes galaxies: structure cosmology: theory dark matter |
| 英文摘要 | The flux-ratio anomalies observed in multiply lensed quasar images are most plausibly explained as the result of perturbing structures superposed on the underlying smooth matter distribution of the primary lens. The cold dark matter cosmological model predicts that a large number of substructures should survive inside larger haloes but, surprisingly, this population alone has been shown to be insufficient to explain the observed distribution of the flux ratios of quasars multiple images. Other haloes (and their subhaloes) projected along the line of sight to the primary lens have been considered as additional sources of perturbation. In this work, we use ray tracing through the Millennium II simulation to investigate the importance of projection effects due to haloes and subhaloes of mass m > 108 h-1 M? and extend our analysis to lower masses, m= 106 h-1 M?, using Monte Carlo halo distributions. We find that the magnitude of the violation depends strongly on the density profile and concentration of the intervening haloes, but clustering plays only a minor role. For a typical lensing geometry (lens at a redshift of 0.6 and source at a redshift of 2), background haloes (behind the main lens) are more likely to cause a violation than foreground haloes. We conclude that line-of-sight structures can be as important as intrinsic substructures in causing flux-ratio anomalies. The combined effect of perturbing structures within the lens and along the line of sight in the ? cold dark matter (?CDM) universe results in a cusp-violation probability of 2030 per cent. This alleviates the discrepancy between models and current data, but a larger observational sample is required for a stronger test of the theory. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000302620500054 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6163]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany 3.Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England 4.Max Planck Inst Astrophys, D-85740 Garching, Germany 5.Univ Durham, Inst Computat Cosmol, Dept Phys, Durham DH1 3LE, England |
| 推荐引用方式 GB/T 7714 | Xu, D. D.,Mao, Shude,Cooper, Andrew P.,et al. On the effects of line-of-sight structures on lensing flux-ratio anomalies in a Lambda CDM universe[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,421(3):2553-2567. |
| APA | Xu, D. D..,Mao, Shude.,Cooper, Andrew P..,Gao, Liang.,Frenk, Carlos S..,...&Helly, John.(2012).On the effects of line-of-sight structures on lensing flux-ratio anomalies in a Lambda CDM universe.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,421(3),2553-2567. |
| MLA | Xu, D. D.,et al."On the effects of line-of-sight structures on lensing flux-ratio anomalies in a Lambda CDM universe".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 421.3(2012):2553-2567. |
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来源：国家天文台
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