Effect of Hot Baryons on the Weak-Lensing Shear Power Spectrum

Details Effect of Hot Baryons on the Weak-Lensing Shear Power Spectrum Effect of Hot Baryons on the Weak-Lensing Shear Power Spectrum

2004-09-08

arxiv.org/abs/astro-ph/0409198v2

Astrophys.J.616:L75-L78,2004

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

10.1086/426712

We investigate the impact of the intracluster medium on the weak-lensing shear power spectrum (PS). Using a halo model we find that, compared to the dark matter only case, baryonic pressure leads to a suppression of the shear PS on the order of a few percent or more for $l \gtrsim 1000$. Cooling/cooled baryons and the intergalactic medium can further alter the shear PS. Therefore, the interpretation of future precision weak lensing data at high multipoles must take into account the effects of baryons.

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