The effects of galaxy formation on the matter power spectrum: A challenge for precision cosmology

Details The effects of galaxy formation on the matter power spectrum: A challenge for precision cosmology The effects of galaxy formation on the matter power spectrum: A challenge for precision cosmology

2011-04-06

arxiv.org/abs/1104.1174v2

MNRAS, 2011, Volume 415, Issue 4, pp. 3649-3665

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

18 pages, 11 figures. Accepted for publication in MNRAS. Minor changes relative to v1

Scientific paper

10.1111/j.1365-2966.2011.18981.x

Upcoming weak lensing surveys, such as LSST, EUCLID, and WFIRST, aim to measure the matter power spectrum with unprecedented accuracy. In order to fully exploit these observations, models are needed that, given a set of cosmological parameters, can predict the non-linear matter power spectrum at the level of 1% or better for scales corresponding to comoving wave numbers 0.170 h/Mpc. Therefore, baryons, and particularly AGN feedback, cannot be ignored in theoretical power spectra for k>0.3 h/Mpc. It will thus be necessary to improve our understanding of feedback processes in galaxy formation, or at least to constrain them through auxiliary observations, before we can fulfil the goals of upcoming weak lensing surveys.

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