SELF-CALIBRATION OF GRAVITATIONAL SHEAR-GALAXY INTRINSIC ELLIPTICITY CORRELATION IN WEAK LENSING SURVEYS | |
Zhang, Pengjie | |
刊名 | ASTROPHYSICAL JOURNAL
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2010-09-10 | |
卷号 | 720期号:2页码:1090-1101 |
关键词 | cosmology: observations cosmology: theory gravitational lensing: weak large-scale structure of universe |
英文摘要 | The galaxy intrinsic alignment is a severe challenge to precision cosmic shear measurement. We propose self-calibrating the induced gravitational shear-galaxy intrinsic ellipticity correlation (the GI correlation) in weak lensing surveys with photometric redshift measurements. (1) We propose a method to extract the intrinsic ellipticity-galaxy density cross-correlation (I-g) from the galaxy ellipticity-density measurement in the same redshift bin. (2) We also find a generic scaling relation to convert the extracted I-g correlation to the necessary GI correlation. We perform a concept study under simplified conditions and demonstrate its capability to significantly reduce GI contamination. We discuss the impact of various complexities on the two key ingredients of the self-calibration technique, namely the method for extracting the I-g correlation and the scaling relation between the I-g and the GI correlation. We expect that none of them will likely be able to completely invalidate the proposed self-calibration technique. |
WOS标题词 | Science & Technology ; Physical Sciences |
类目[WOS] | Astronomy & Astrophysics |
研究领域[WOS] | Astronomy & Astrophysics |
关键词[WOS] | DIGITAL SKY SURVEY ; LUMINOUS RED GALAXIES ; LARGE-SCALE STRUCTURE ; DARK-MATTER HALOS ; COSMIC SHEAR ; PHOTOMETRIC REDSHIFT ; POWER SPECTRA ; ALIGNMENTS ; BARYONS ; BIAS |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000281624300012 |
公开日期 | 2015-02-02 |
内容类型 | 期刊论文 |
源URL | [http://119.78.226.72//handle/331011/15511] ![]() |
专题 | 上海天文台_星系宇宙学重点实验室 |
作者单位 | Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang, Pengjie. SELF-CALIBRATION OF GRAVITATIONAL SHEAR-GALAXY INTRINSIC ELLIPTICITY CORRELATION IN WEAK LENSING SURVEYS[J]. ASTROPHYSICAL JOURNAL,2010,720(2):1090-1101. |
APA | Zhang, Pengjie.(2010).SELF-CALIBRATION OF GRAVITATIONAL SHEAR-GALAXY INTRINSIC ELLIPTICITY CORRELATION IN WEAK LENSING SURVEYS.ASTROPHYSICAL JOURNAL,720(2),1090-1101. |
MLA | Zhang, Pengjie."SELF-CALIBRATION OF GRAVITATIONAL SHEAR-GALAXY INTRINSIC ELLIPTICITY CORRELATION IN WEAK LENSING SURVEYS".ASTROPHYSICAL JOURNAL 720.2(2010):1090-1101. |
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