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X-ray constraints on the shape of the dark matter in five Abell clustersX-ray observations obtained with the Einstein Observatory are used to constrain the shape of the dark matter in the inner regions of Abell clusters A401, A426, A1656, A2029, and A2199, each of which exhibits highly flattened optical isopleths. The dark matter is modeled as an ellipsoid with a mass density of about r exp -2. The possible shapes of the dark matter is constrained by comparing these model isophotes to the image isophotes. The X-ray isophotes, and therefore the gravitational potentials, have ellipticities of about 0.1-0.2. The dark matter within the central 1 Mpc is found to be substantially rounder for all the clusters. It is concluded that the shape of the galaxy distributions in these clusters traces neither the gravitational potential nor the gravitating matter.
Document ID
19930032429
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Buote, David A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Canizares, Claude R. (MIT Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 400
Issue: 2
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-1656
CONTRACT_GRANT: NAS8-38249
Distribution Limits
Public
Copyright
Other