MNRAS-2004-Rowley-508-22.pdf (641.04 kB)
The merger history of clusters and its effect on the X-ray properties of the intracluster medium
journal contribution
posted on 2023-06-08, 09:49 authored by David R Rowley, Peter ThomasPeter Thomas, Scott T KayWe investigate the growth over time of 20 massive (>3 keV) clusters in a hydrodynamical simulation of the ? cold dark matter cosmology with radiative cooling. The clusters show a variety of formation histories: some accrete most of their mass in major mergers; others, more gradually. During major mergers, the long-term (temporally smoothed) luminosity increases such that the cluster moves approximately along the LX–TX relation; between times, it slowly decreases, tracking the drift of the LX–TX relation. We identify several different kinds of short-term luminosity and temperature fluctuations associated with major mergers including double-peaked mergers, in which the global intracluster medium merges first (LX and TX increase together) and then the cluster cores merge (LX increases and TX decreases). At both luminosity peaks, clusters tend to appear to be spherical and relaxed, which may lead to biases in high-redshift, flux-limited samples. There is no simple relationship between scatter in the LX–TX relation nor in the recent or overall merger activity or cluster formation time. The scatter in the LX–M and TX–M relations is reduced if properties are measured within R500 rather than Rvir.
History
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- Published
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- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
2Volume
352Page range
508-522Pages
15.0Department affiliated with
- Physics and Astronomy Publications
Notes
Rowley was a postgraduate student and Thomas his supervisor; Kay was his PDRA who helped to set up the simulations. This paper demonstrated two distinct modes of cluster growth and the different effect these have on the movement of clusters in the Lx-Tx plane.Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06First Open Access (FOA) Date
2016-03-22First Compliant Deposit (FCD) Date
2017-03-07Usage metrics
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