Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 435, Issue 1, Pages 194-206Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1269
Keywords
methods: analytical; large-scale structure of Universe
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Funding
- German Research Foundation's (DFG's) [Schwerpunktprogramm SPP1177]
- Graduate Academy, Heidelberg
- International Max Planck Research School for Astronomy and Cosmic Physics in Heidelberg
- Graduate School of Fundamental Physics
- DFG within the framework of the excellence initiative through the Heidelberg Graduate School of Fundamental Physics.
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Subject of this paper is the statistical properties of ellipticity alignments between galaxies evoked by their coupled angular momenta. Starting from physical angular momentum models, we bridge the gap towards ellipticity correlations, ellipticity spectra and derived quantities such as aperture moments, comparing the intrinsic signals with those generated by gravitational lensing, with the projected galaxy sample of Euclid in mind. We investigate the dependence of intrinsic ellipticity correlations on cosmological parameters and show that intrinsic ellipticity correlations give rise to non-Gaussian likelihoods as a result of non-linear functional dependences. Comparing intrinsic ellipticity spectra to weak lensing spectra we quantify the magnitude of their contaminating effect on the estimation of cosmological parameters and find that biases on dark energy parameters are very small in an angular momentum-based model in contrast to the linear alignment model commonly used. Finally, we quantify whether intrinsic ellipticities can be measured in the presence of the much stronger weak lensing induced ellipticity correlations, if prior knowledge on a cosmological model is assumed.
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