The distribution of dark matter in the A2256 cluster

Details The distribution of dark matter in the A2256 cluster The distribution of dark matter in the A2256 cluster

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993stin...9421579h&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Dark Matter, Star Clusters, Star Distribution, Stellar Mass, X Ray Sources, Cosmology, Galaxies, X Ray Astronomy

Scientific paper

Using spatially resolved X-ray spectroscopy, it was determined that the X-ray emitting gas in the rich cluster A2256 is nearly isothermal to a radius of at least 0.76/h Mpc, or about three core radii. These data can be used to measure the distribution of the dark matter in the cluster. It was found that the total mass interior to 0.76/h Mpc and 1.5/h Mpc is (0.5 +/- 0.1 and 1.0 +/- 0.5) x 1015/h of the solar mass respectively where the errors encompass the full range allowed by all models used. Thus, the mass appropriate to the region where spectral information was obtained is well determined, but the uncertainties become large upon extrapolating beyond that region. It is shown that the galaxy orbits are midly anisotropic which may cause the beta discrepancy in this cluster.

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