Spectral constraints on models of gas in clusters of galaxies

Details Spectral constraints on models of gas in clusters of galaxies Spectral constraints on models of gas in clusters of galaxies

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..681h&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

7

Galactic Clusters, Interstellar Gas, X Ray Astronomy, X Ray Spectra, Constraints, Equations Of State, Gas Temperature, Heao 1, Interstellar Magnetic Fields, Iron, Models, Temperature Profiles

Scientific paper

The HEAO 1A2 spectra of clusters of galaxies are used to determine the temperature profile which characterizes the X-ray emitting gas. Strong evidence of nonisothermality is found for the Coma, A85, and A1795 clusters. Properties of the cluster potential which binds the gas are calculated for a range of model parameters. The typical binding mass, if the gas is adiabatic, is 2-4E14 solar masses and is quite centrally concentrated. In addition, the Fe abundance in Coma is .26 + or - .06 solar, less than the typical value (.5) found for rich clusters. The results for the gas in Coma may imply a physical description of the cluster which is quite different from what was previously believed.

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