The impact of cooling and pre-heating on the Sunyaev-Zel'dovich effect
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0107577,
title = {The impact of cooling and pre-heating on the Sunyaev-Zel'dovich effect},
author = {Antonio C da Silva and Scott T Kay and Andrew R Liddle and Peter A Thomas and Frazer R Pearce and Domingos Barbosa},
journal= {arXiv preprint arXiv:astro-ph/0107577},
year = {2009}
}
Comments
4 pages LaTeX file with five figures incorporated. Various clarifications to the discussion. Further colour images and animations at http://astronomy.susx.ac.uk/users/antonio/sz.html