The Effect of Radiative Cooling on Scaling Laws of X-Ray Groups and Clusters

Muanwong, O, Thomas, P A, Kay, S T, Pearce, F R and Couchman, H M P (2001) The Effect of Radiative Cooling on Scaling Laws of X-Ray Groups and Clusters. Astrophysical Journal, 552 (1). pp. 27-30. ISSN 0004-637X

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Abstract

We have performed cosmological simulations in a LambdaCDM cosmology with and without radiative cooling in order to study the effect of cooling on the cluster scaling laws. Our simulations consist of 4.1 million particles each of gas and dark matter within a box size of 100 h-1 Mpc, and the run with cooling is the largest of its kind to have been evolved to z=0. Our cluster catalogs both consist of over 400 objects and are complete in mass down to ~1013 h-1 Msolar. We contrast the emission-weighted temperature-mass (Tew-M) and bolometric luminosity-temperature (Lbol-Tew) relations for the simulations at z=0. We find that radiative cooling increases the temperature of intracluster gas and decreases its total luminosity, in agreement with the results of Pearce et al. Furthermore, the temperature dependence of these effects flattens the slope of the Tew-M relation and steepens the slope of the Lbol-Tew relation. Inclusion of radiative cooling in the simulations is sufficient to reproduce the observed X-ray scaling relations without requiring excessive nongravitational energy injection.

Item Type: Article
Additional Information: Muanwong was a postgraduate student and Thomas was her supervisor. Kay was a PDRA and Pearce and Couchman collaborators who helped to undertake the simulations. . (85 citations)
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Peter Thomas
Date Deposited: 06 Feb 2012 20:10
Last Modified: 12 Mar 2017 06:26
URI: http://sro.sussex.ac.uk/id/eprint/24407

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