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Intrinsic alignments of galaxies are recognised as one of the most importantsystematic in weak lensing surveys on small angular scales. In this paper weinvestigate ellipticity correlation functions that are measured separately onelliptical and spiral galaxies, for which we assume the generic alignmentmechanisms based on tidal shearing and tidal torquing, respectively. Includingmorphological information allows to find linear combinations of measuredellipticity correlation functions which suppress the gravitational lensingsignal completely or which show a strongly boosted gravitational lensing signalrelative to intrinsic alignments. Specifically, we find that $(i)$ intrinsicalignment spectra can be measured in a model-independent way at a significanceof $\Sigma\simeq 60$ with a wide-angle tomographic survey such as Euclid's,$(ii)$ intrinsic alignment model parameters can be determined at percent-levelprecision, $(iii)$ this measurement is not impeded by misclassifying galaxiesand assuming a wrong alignment model, $(iv)$ parameter estimation from acleaned weak lensing spectrum is possible with almost no bias and $(v)$ themisclassification would not strongly impact parameter estimation from theboosted weak lensing spectrum.

Statistical separation of weak gravitational lensing and intrinsic ellipticities based on galaxy colour information