期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 352, 期 2, 页码 508-522出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.07941.x
关键词
galaxies : clusters : general
We 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 L-X-T-X relation; between times, it slowly decreases, tracking the drift of the L-X-T-X 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 (L-X and T-X increase together) and then the cluster cores merge (L-X increases and T-X 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 L-X-T-X relation nor in the recent or overall merger activity or cluster formation time. The scatter in the L-X-M and T-X-M relations is reduced if properties are measured within R-500 rather than R-vir.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据