Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-17
Astrophys.J. 577 (2002) 595-603
Astronomy and Astrophysics
Astrophysics
9 pages, 6 figures, Accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/342120
We have analysed 53 square degrees of imaging data from the Red-Sequence Cluster Survey (RCS), and measured the excess correlations in the shapes of galaxies on scales out to ~1.5 degrees. We separate the signal into an ``E''- (lensing) and ``B''-mode (systematics), which allows us to study residual systematics. On scales larger than 10 arcminutes, we find no ``B''-mode. On smaller scales we find a small, but significant ``B''-mode. This signal is also present when we select a sample of bright galaxies. These galaxies are rather insensitive to observational distortions, and we therefore conclude that the oberved ``B''-mode is likely to be caused by intrinsic alignments. We therefore limit the cosmic shear analysis to galaxies with 22
Gladders Mike
Hoekstra Henk
Yee Howard
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