Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9210724w&link_type=abstract
Final Technical Report, 1 Aug. 1989 - 31 Jan. 1990 Alabama Univ., Huntsville. Dept. of Physics and Astronomy.
Astronomy and Astrophysics
Astronomy
Dark Matter, Galactic Clusters, Mass Distribution, Proportional Counters, Universe, X Ray Analysis, Atmospheric Temperature, Brightness, Emissivity, Gravitational Fields, Heao 2, High Temperature Gases, Hydrostatics, Imaging Techniques
Scientific paper
The mass distributions were determined of several clusters of galaxies by using X ray surface brightness data from the Einstein Observatory Imaging Proportional Counter (IPC). Determining cluster mass distributions is important for constraining the nature of the dark matter which dominates the mass of galaxies, galaxy clusters, and the Universe. Galaxy clusters are permeated with hot gas in hydrostatic equilibrium with the gravitational potentials of the clusters. Cluster mass distributions can be determined from x ray observations of cluster gas by using the equation of hydrostatic equilibrium and knowledge of the density and temperature structure of the gas. The x ray surface brightness at some distance from the cluster is the result of the volume x ray emissivity being integrated along the line of sight in the cluster.
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