Accurate shear measurement with faint sources
文献类型：期刊论文
| 作者 | Zhang, Jun1,3; Luo, Wentao2; Foucaud, Sebastien1 |
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2015 |
| 期号 | 1页码:1 |
| 关键词 | weak gravitational lensing gravitational lensing |
| 英文摘要 | For cosmic shear to become an accurate cosmological probe, systematic errors in the shear measurement method must be unambiguously identified and corrected for Previous work of this series has demonstrated that cosmic shears can be measured accurately in Fourier space in the presence of background noise and finite pixel size, without assumptions on the morphologies of galaxy and PSF. The remaining major source of error is source Poisson noise, due to the finiteness of source photon number. This problem is particularly important for faint galaxies in space-based weak lensing measurements, and for ground-based images of short exposure times. In this work, we propose a simple and rigorous way of removing the shear bias from the source Poisson noise. Our noise treatment, can be generalized for images made of multiple exposures through Multi Drizzle. This is demonstrated with the SDSS and COSMOS/ACS data. With a large ensemble of mock galaxy images of unrestricted morphologies, we show that our shear measurement method can achieve sub-percent level accuracy even for images of signal-to-noise ratio less than 5 in general, making it the most promising technique for cosmic shear measurement in the ongoing and upcoming large scale galaxy surveys. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 研究领域[WOS] | Astronomy & Astrophysics ; Physics |
| 关键词[WOS] | HUBBLE-SPACE-TELESCOPE ; WEAK-LENSING SURVEYS ; GALAXY SHAPE MEASUREMENT ; CHARGE-TRANSFER INEFFICIENCY ; DIGITAL SKY SURVEY ; ADVANCED CAMERA ; IMAGE-ANALYSIS ; CHALLENGE ; COSMOS ; NOISE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000349283000024 |
| 公开日期 | 2015-08-18 |
| 源URL | [http://119.78.226.72/handle/331011/18208]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Shanghai Jiao Tong Univ, Dept Phys & Astron, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China 2.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Univ Texas Austin, Texas Cosmol Ctr, Austin, TX 78712 USA |
| 推荐引用方式 GB/T 7714 | Zhang, Jun,Luo, Wentao,Foucaud, Sebastien. Accurate shear measurement with faint sources[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2015(1):1. |
| APA | Zhang, Jun,Luo, Wentao,&Foucaud, Sebastien.(2015).Accurate shear measurement with faint sources.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(1),1. |
| MLA | Zhang, Jun,et al."Accurate shear measurement with faint sources".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .1(2015):1. |
入库方式： OAI收割
来源：上海天文台
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