The Formation Histories of Galaxy Clusters

Details The Formation Histories of Galaxy Clusters The Formation Histories of Galaxy Clusters

2005-06-09

arxiv.org/abs/astro-ph/0506213v2

Astropart.Phys.24:316-333,2005

Astronomy and Astrophysics

Astrophysics

24 pages, final version to appear in Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2005.07.

A sample of hundreds of simulated galaxy clusters is used to study the statistical properties of galaxy cluster formation. Individual assembly histories are discussed, the degree of virialization is demonstrated and various commonly used formation times are measured and inter-compared. In addition, the fraction of clusters which have ``recently'' undergone a major merger or significant mass jump is calculated as a function of lookback time and interval. The fraction of three- and four-body mergers is also studied.

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