MASK EFFECTS ON COSMOLOGICAL STUDIES WITH WEAK-LENSING PEAK STATISTICS
文献类型：期刊论文
| 作者 | Liu, Xiangkun1; Wang, Qiao2 ; Pan, Chuzhong1; Fan, Zuhui1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-03-20 |
| 卷号 | 784期号:1 |
| 关键词 | dark matter galaxies: clusters: general gravitational lensing: weak large-scale structure of universe |
| 英文摘要 | With numerical simulations, we analyze in detail how the bad data removal, i.e., the mask effect, can influence the peak statistics of the weak-lensing convergence field reconstructed from the shear measurement of background galaxies. It is found that high peak fractions are systematically enhanced because of the presence of masks; the larger the masked area is, the higher the enhancement is. In the case where the total masked area is about 13% of the survey area, the fraction of peaks with signal-to-noise ratio. >= 3 is similar to 11% of the total number of peaks, compared with similar to 7% of the mask-free case in our considered cosmological model. This can have significant effects on cosmological studies with weak-lensing convergence peak statistics, inducing a large bias in the parameter constraints if the effects are not taken into account properly. Even for a survey area of 9 deg(2), the bias in (Omega(m), sigma(8)) is already intolerably large and close to 3 sigma. It is noted that most of the affected peaks are close to the masked regions. Therefore, excluding peaks in those regions in the peak statistics can reduce the bias effect but at the expense of losing usable survey areas. Further investigations find that the enhancement of the number of high peaks around the masked regions can be largely attributed to the smaller number of galaxies usable in the weak-lensing convergence reconstruction, leading to higher noise than that of the areas away from the masks. We thus develop a model in which we exclude only those very large masks with radius larger than 3' but keep all the other masked regions in peak counting statistics. For the remaining part, we treat the areas close to and away from the masked regions separately with different noise levels. It is shown that this two-noise-level model can account for the mask effect on peak statistics very well, and the bias in cosmological parameters is significantly reduced if this model is applied in the parameter fitting. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000335457000031 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6395]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Xiangkun,Wang, Qiao,Pan, Chuzhong,et al. MASK EFFECTS ON COSMOLOGICAL STUDIES WITH WEAK-LENSING PEAK STATISTICS[J]. ASTROPHYSICAL JOURNAL,2014,784(1). |
| APA | Liu, Xiangkun,Wang, Qiao,Pan, Chuzhong,&Fan, Zuhui.(2014).MASK EFFECTS ON COSMOLOGICAL STUDIES WITH WEAK-LENSING PEAK STATISTICS.ASTROPHYSICAL JOURNAL,784(1). |
| MLA | Liu, Xiangkun,et al."MASK EFFECTS ON COSMOLOGICAL STUDIES WITH WEAK-LENSING PEAK STATISTICS".ASTROPHYSICAL JOURNAL 784.1(2014). |
入库方式： OAI收割
来源：国家天文台
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