X-ray constraints on the shape of the dark matter in five Abell clusters

Details X-ray constraints on the shape of the dark matter in five Abell clusters X-ray constraints on the shape of the dark matter in five Abell clusters

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..385b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 2, p. 385-397.

Astronomy and Astrophysics

Astronomy

39

Dark Matter, Galactic Clusters, Galactic Structure, X Ray Astronomy, Astronomical Models, Brightness Distribution, Isophotes, Rotating Matter

Scientific paper

X-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.

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