SELF-CALIBRATION OF GRAVITATIONAL SHEAR-GALAXY INTRINSIC ELLIPTICITY CORRELATION IN WEAK LENSING SURVEYS

	SELF-CALIBRATION OF GRAVITATIONAL SHEAR-GALAXY INTRINSIC ELLIPTICITY CORRELATION IN WEAK LENSING SURVEYS
	Zhang, Pengjie
刊名	ASTROPHYSICAL JOURNAL
	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.