Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..439k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 15, 1983, p. 439-448.
Astronomy and Astrophysics
Astrophysics
189
Galactic Clusters, Interstellar Gas, X Ray Sources, Brightness Distribution, Dark Matter, Electron Density (Concentration), Heao 2, Mass To Light Ratios
Scientific paper
X-ray observations of 16 poor clusters containing central dominant galaxies have been performed with the IPC of the Einstein Observatory. Twelve clusters were detected, and in each case the X-ray emission is centered on the dominant galaxy. For the six brightest clusters, the authors find extended X-ray emission that is smooth, centrally peaked, reasonably symmetric, and reaches in one case to nearly 1 Mpc and possibly farther. X-ray temperatures are in the range 1 - 5 keV. Mean mass-to-light ratios are derived for the bright clusters and evidence for the presence of dark matter is presented. The X-ray data show clearly that the dominant galaxies sit at the bottoms of the poor cluster gravitational potential wells. This suggests a similar origin for dominant galaxies in poor and rich clusters, possibly through mergers and cannibalism of cluster galaxies.
Canizares Calude R.
Cioffi Denis F.
Kriss Gerard Anthony
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