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

Published online by Cambridge University Press:  06 October 2004

Ben Moore
Affiliation:
Institute for Theoretical Physics, University of Zürich, Winterthurerstr. 190, CH-8057 Zürich, Switzerland email: moore@physik.unizh.ch
Jüurg Diemand
Affiliation:
Institute for Theoretical Physics, University of Zürich, Winterthurerstr. 190, CH-8057 Zürich, Switzerland email: moore@physik.unizh.ch
Joachim Stadel
Affiliation:
Institute for Theoretical Physics, University of Zürich, Winterthurerstr. 190, CH-8057 Zürich, Switzerland email: moore@physik.unizh.ch
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Abstract

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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 “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.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Copyright
© 2004 International Astronomical Union