The impact of cooling and pre-heating on the Sunyaev-Zel'dovich effect

Details The impact of cooling and pre-heating on the Sunyaev-Zel'dovich effect The impact of cooling and pre-heating on the Sunyaev-Zel'dovich effect

2001-07-31

arxiv.org/abs/astro-ph/0107577v3

Astronomy and Astrophysics

Astrophysics

4 pages LaTeX file with five figures incorporated. Various clarifications to the discussion. Further colour images and animati

Scientific paper

10.1086/324574

We use hydrodynamical simulations to assess the impact of radiative cooling and `pre-heating' on predictions for the Sunyaev--Zel'dovich (SZ) effect. Cooling significantly reduces both the mean SZ signal and its angular power spectrum, while pre-heating can give a higher mean distortion while leaving the angular power spectrum below that found in a simulation without heating or cooling. We study the relative contribution from high and low density gas, and find that in the cooling model about 60 per cent of the mean thermal distortion arises from low overdensity gas. We find that haloes dominate the thermal SZ power spectrum in all models, while in the cooling simulation the kinetic SZ power spectrum originates predominantly in lower overdensity gas.

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