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The Scaling Relations for Clusters of Galaxies

Fundamental Planes, Cluster Structure, and Cluster Evolution

Published online by Cambridge University Press:  25 May 2016

J. Annis
J. Annis*
Affiliation:
Experimental Astrophysics Group, Fermilab

Extract

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The dominant baryonic component of clusters of galaxies is their X-ray emitting atmosphere. X-ray surveys have made it possible to examine this component in large samples of clusters. David et al. (1993) provided a catalog of X-ray temperatures. I have measured 79 clusters from that list using Einstein IPC data (Harris et al. 1990), determining several measures of the radius. The most useful turns out to be the Petrosian radius. Given a radius, one can measure the surface brightness at that position.

Type
Part 5. Extra-Galactic Astronomy
Information
Symposium - International Astronomical Union , Volume 179: New Horizons from Multi-Wavelength Sky Surveys , 1998 , pp. 268 - 269
Copyright
Copyright © Kluwer 1998 

References

Annis, J. 1996 Astrophys. J., submitted.Google Scholar
David, L. P., Slyz, A., Jones, C., Forman, W., Vrtilek, S. D. and Arnaud, K. A. 1993 Astrophys. J. 412 479.Google Scholar
Harris, D. E. et al. 1990, The Einstein Observatory Catalog of IPC X-ray Sources (Smithsonian Institution Astrophysical Observatory).Google Scholar