Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-04
Astrophys.J.720:1090,2010
Astronomy and Astrophysics
Astrophysics
14 pages, 4 figures. Heavily expanded version. No changes in major results and conclusions. Accepted to ApJ
Scientific paper
10.1088/0004-637X/720/2/1090
The galaxy intrinsic alignment is a severe challenge to precision cosmic shear measurement. We propose to self-calibrate the induced gravitational shear-galaxy intrinsic ellipticity correlation (the GI correlation, \citealt{Hirata04b}) in weak lensing surveys with photometric redshift measurement. (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 demanded GI correlation. We perform concept study under simplified conditions and demonstrate its capability to significantly reduce the GI contamination. We discuss the impact of various complexities on the two key ingredients of the self-calibration technique, namely the method to extract the I-g correlation and the scaling relation between the I-g and the GI correlation. We expect none of them is likely able to completely invalidate the proposed self-calibration technique.
No associations
LandOfFree
Self calibration of gravitational shear-galaxy intrinsic ellipticity correlation in weak lensing surveys does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Self calibration of gravitational shear-galaxy intrinsic ellipticity correlation in weak lensing surveys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self calibration of gravitational shear-galaxy intrinsic ellipticity correlation in weak lensing surveys will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-372589