The linear velocity field of SDSS DR7 galaxies: constraints on flow amplitudes and the growth rate
Abstract
Large-scale peculiar motion modulates the observed luminosity distribution of galaxies. Using about half a million SDSS galaxies, this can be harnessed to obtain bounds on peculiar velocity moments, the amplitude of the linear matter power spectrum, σ8, and the growth rate of density perturbations at z ~ 0.1. Results obtained from this approach agree well with the predictions of the model and are consistent with the reported ~ 1% zero-point tilt in the SDSS photometry.
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