Non-negative Matrix Factorization for Self-calibration of Photometric Redshift Scatter in Weak-lensing Surveys
文献类型：期刊论文
| 作者 | Zhang, Le2; Yu, Yu1,2; Zhang, Pengjie2,3,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017-10-10 |
| 卷号 | 848期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Cosmology: Observations Gravitational Lensing: Weak Techniques: Photometric |
| DOI | 10.3847/1538-4357/aa8c72 |
| 英文摘要 | Photo-z error is one of the major sources of systematics degrading the accuracy of weak-lensing cosmological inferences. Zhang et al. proposed a self-calibration method combining galaxy-galaxy correlations and galaxyshear correlations between different photo-z bins. Fisher matrix analysis shows that it can determine the rate of photo-z outliers at a level of 0.01%-1% merely using photometric data and do not rely on any prior knowledge. In this paper, we develop a new algorithm to implement this method by solving a constrained nonlinear optimization problem arising in the self-calibration process. Based on the techniques of fixed-point iteration and non-negative matrix factorization, the proposed algorithm can efficiently and robustly reconstruct the scattering probabilities between the true-z and photo-z bins. The algorithm has been tested extensively by applying it to mock data from simulated stage IV weak-lensing projects. We find that the algorithm provides a successful recovery of the scatter rates at the level of 0.01%-1%, and the true mean redshifts of photo-z bins at the level of 0.001, which may satisfy the requirements in future lensing surveys. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000412819100004 |
| 源URL | [http://119.78.226.72/handle/331011/32575]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Zhang, Le |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Shanghai Jiao Tong Univ, Dept Astron, Shanghai 200240, Peoples R China 3.Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, Shanghai 200240, Peoples R China 4.Tsung Dao Lee Inst, Shanghai 200240, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Le,Yu, Yu,Zhang, Pengjie. Non-negative Matrix Factorization for Self-calibration of Photometric Redshift Scatter in Weak-lensing Surveys[J]. ASTROPHYSICAL JOURNAL,2017,848(1). |
| APA | Zhang, Le,Yu, Yu,&Zhang, Pengjie.(2017).Non-negative Matrix Factorization for Self-calibration of Photometric Redshift Scatter in Weak-lensing Surveys.ASTROPHYSICAL JOURNAL,848(1). |
| MLA | Zhang, Le,et al."Non-negative Matrix Factorization for Self-calibration of Photometric Redshift Scatter in Weak-lensing Surveys".ASTROPHYSICAL JOURNAL 848.1(2017). |
入库方式： OAI收割
来源：上海天文台
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