Baryons and weak lensing power spectra

Details Baryons and weak lensing power spectra Baryons and weak lensing power spectra

2004-05-28

arxiv.org/abs/astro-ph/0405593v2

Astropart.Phys.22:211-217,2004

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures. Matches version accepted by Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2004.06.

We provide a simple toy model to elucidate the effects of baryonic cooling on predictions of the convergence power spectrum in weak gravitational lensing. Our model suggests that the effects of baryonic cooling on dark matter halo profiles can alter the dark matter power spectrum at k~10 h/Mpc and lead to percent level changes in the convergence angular power spectrum at wavenumbers of several thousand. These effects would be measurable with planned weak lensing surveys and will impact constraints on cosmological parameters.

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