Detection Of Large Scale Intrinsic Ellipticity-Density Correlation From The Sloan Digital Sky Survey And Implications For Weak Lensing Surveys

Details Detection Of Large Scale Intrinsic Ellipticity-Density Correlation From The Sloan Digital Sky Survey And Implications For Weak Lensing Surveys Detection Of Large Scale Intrinsic Ellipticity-Density Correlation From The Sloan Digital Sky Survey And Implications For Weak Lensing Surveys

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.6201i&link_type=abstract

American Astronomical Society Meeting 208, #62.01; Bulletin of the American Astronomical Society, Vol. 38, p.142

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The power spectrum of weak lensing shear caused by large-scale structure is an emerging tool for precision cosmology. Potential sources of systematic errors are i) intrinsic alignments of ellipticities (II correlation) and ii) correlation between the intrinsic ellipticities of galaxies and the density field responsible for gravitational lensing shear (GI correlation). We present constraints on both the II and GI correlations using 265 908 spectroscopic galaxies from the Sloan Digital Sky Survey (SDSS). We have a clear detection of GI correlation in galaxies brighter than L* that persists to the largest scales probed (60/h Mpc) and with a sign predicted by theoretical models. While we find no detection of the II correlation, our results are nonetheless statistically consistent with recent detections found using the SuperCOSMOS survey. The GI correlation could cause the existing lensing surveys at z 1 to underestimate the linear amplitude of fluctuations by as much as 20% depending on the source sample used, while for surveys at z 0.5 the underestimation may reach 30%. The GI contamination is dominated by the brightest galaxies, possibly due to the alignment of brightest cluster galaxies (BCGs) with the cluster ellipticity due to anisotropic infall along filaments, although other sources of contamination cannot be excluded at this point. We propose that cosmic shear surveys should consider rejection of BCGs from their source catalogs as a test for GI contamination. Future high precision weak lensing surveys must develop methods to search for and remove this contamination if they are to achieve their promise.

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