The three-dimensional power spectrum of dark and luminous matter from the VIRMOS-DESCART cosmic shear survey
Résumé
We find an average bias b= 1.24 +/- 0.18 for the I-selected galaxies, and a cross-correlation coefficient r= 0.75 +/- 0.23. Together with the power spectra, these results optimally encode the entire two point information about dark matter and galaxies, including galaxy-galaxy lensing. We address some of the implications regarding galaxy haloes and mass-to-light ratios. The best-fitting `halo' parameter h≡r/b= 0.57 +/- 0.16, suggesting that dynamical masses estimated using galaxies systematically underestimate total mass.
Ongoing surveys, such as the Canada-France-Hawaii Telescope Legacy Survey, will significantly improve on the dynamic range, and future photometric redshift catalogues will allow tomography along the same principles.
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