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Cosmic shear leads to a correlation of the observed ellipticities ofgalaxies, an effect which is used to place constraints on cosmologicalparameters, and to explore the evolution of dark matter and dark energy in theuniverse. However, a possible systematic contaminant of the lensing signal isintrinsic galaxy alignment, with a correlation length of a few Mpc. Hirata &Seljak (2004) have recently demonstrated that for some models of intrinsicdistortions, there may also be a cross-correlation between the intrinsic andlensing signals, which may dominate the intrinsic signal, and suppress thelensing power spectrum by several tens of percent. Unlike the pure intrinsicsignal, this new term cannot be accounted for by neglecting or down-weightingpairs of galaxies which are physically close. Extending the correlationfunction tomography method of King & Schneider (2003) we illustrate how theimpact of both intrinsic and cross-correlations can be significantly reduced,in the context of surveys with photometric redshift information. For aground-based cosmic shear survey of ~100 sq. degrees with photometricredshifts, even in the presence of systematic contaminants at the levelconsidered here, cosmological models degenerate in the Omega_m-sigma_8 planecan be distinguished well in excess of the 3-sigma level.Comment: To appear in A&A; 7 pages, 4 figure

Cosmic shear as a tool for precision cosmology: minimising intrinsic galaxy alignment-lensing interference