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arXiv:astro-ph/0406615 (astro-ph)
[Submitted on 28 Jun 2004]

Title:On the age-radius relation and orbital history of cluster galaxies

Authors:Ben Moore, Juerg Diemand, Joachim Stadel (University of Zurich)
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Abstract: We explore the region of influence of a galaxy cluster using numerical simulations of cold dark matter halos. Many of the observed galaxies in a cluster are expected to be infalling for the first time. Half of the halos at distances of one to two virial radii today have previously orbited through the cluster, most of them have even passed through the dense inner regions of the cluster. Some halos at distances of up to three times the virial radius have also passed through the cluster core. We do not find a significant correlation of ``infall age'' versus present day position for substructures and the scatter at a given position is very large. This relation may be much more significant if we could resolve the physically overmerged galaxies in the central region.
Comments: To appear in the proceedings of IAU Colloquium 195: "Outskirts of galaxy clusters: intense life in the suburbs", Torino, Italy, March 12-16, 2004
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0406615
  (or arXiv:astro-ph/0406615v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0406615
Related DOI: https://doi.org/10.1017/S1743921304001127

Submission history

From: Ben Moore [view email]
[v1] Mon, 28 Jun 2004 10:13:35 UTC (66 KB)
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