Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376...23e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, July 20, 1991, p. 23-32. SERC-supported research.
Astronomy and Astrophysics
Astronomy
80
Dark Matter, Galactic Clusters, Galactic Radiation, Intergalactic Media, X Ray Astronomy, Mass To Light Ratios, Spatial Resolution, Spectrum Analysis, X Ray Spectra
Scientific paper
An analysis of spatially resolved spectral images of the Perseus cluster obtained with a coded-mask X-ray telescope flown as part of the Spacelab 2 mission is presented. The data allow the temperature and density profiles of the intracluster gas to be measured. From these the cluster potential and hence the cluster mass as a function of radius can be traced. There is significantly less dark matter in the cluster than implied by virial mass estimates based on the galaxies. The dark matter is more centrally condensed than the X-ray emitting gas and probably more so than the galaxies, contrary to expectations from most cosmogonic scenarios. The conclusions are rather robust and insensitive to different parameterizations and assumptions about the X-ray structure, and argue that they favor models in which the dark matter is baryonic.
Bertram D.
Church M. J.
Eyles Chris J.
Ponman Trevor J.
Skinner Gerald K.
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