Journal Article

Nature versus nurture: the curved spine of the galaxy cluster X-ray luminosity–temperature relation

W. G. Hartley, L. Gazzola, F. R. Pearce, S. T. Kay and P. A. Thomas

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 386, issue 4, pages 2015-2021
Published in print June 2008 | ISSN: 0035-8711
Published online April 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13127.x
Nature versus nurture: the curved spine of the galaxy cluster X-ray luminosity–temperature relation

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The physical processes that define the spine of the galaxy cluster X-ray luminosity–temperature (LT) relation are investigated using a large hydrodynamical simulation of the universe. This simulation models the same volume and phases as the millennium simulation and has a linear extent of 500 h−1Mpc. We demonstrate that mergers typically boost a cluster along but also slightly below the LT relation. Due to this boost, we expect that all of the very brightest clusters will be near the peak of a merger. Objects from near the top of the LT relation tend to have assembled much of their mass earlier than an average halo of similar final mass. Conversely, objects from the bottom of the relation are often experiencing an ongoing or recent merger.

Keywords: hydrodynamics; methods: numerical; cosmology: theory

Journal Article.  3883 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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