The power spectrum amplitude from clusters revised: using simulations with preheating and cooling

Viana, Pedro T P, Kay, Scott T, Liddle, Andrew R, Muanwong, Orrarujee and Thomas, Peter A (2003) The power spectrum amplitude from clusters revised: using simulations with preheating and cooling. Monthly Notices of the Royal Astronomical Society, 346 (1). pp. 319-326. ISSN 0035-8711

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The amplitude of density perturbations, for the currently-favoured ACDM cosmology, is constrained using the observed properties of galaxy clusters. The catalogue used is that of Ikebe et al. The relation of cluster temperature to mass is obtained via N-body/hydrodynamical simulations including radiative cooling and pre-heating of cluster gas, which we have previously shown to reproduce well the observed temperature-mass relation in the innermost parts of clusters. We generate and compare mock catalogues via a Monte Carlo method, which allows us to constrain the relation between X-ray temperature and luminosity, including its scatter, simultaneously with cosmological parameters. We find a luminosity-temperature relation in good agreement with the results of Ikebe et al., while for the matter power spectrum normalization, we find sigma8 = 0.78(-0.06)(+0.30) at 95 per cent confidence for Ohm(0) = 0.35. Scaling to the Wilkinson Microwave Anisotropy Probe central value of Ohm(0) = 0.27 would give a best-fitting value of sigma(8) similar or equal to 0.9.

Item Type: Article
Additional Information: Sussex-led collaboration (jointly by Liddle and Thomas) with one external author. Derived the then-best constraint on the density perturbaiton amplityde from galaxy clusters.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Andrew Liddle
Date Deposited: 06 Feb 2012 19:15
Last Modified: 06 Mar 2017 08:17

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