OSO 8 X-ray spectra of clusters of galaxies. I - Observations of twenty clusters: Physical correlations

Details OSO 8 X-ray spectra of clusters of galaxies. I - Observations of twenty clusters: Physical correlations OSO 8 X-ray spectra of clusters of galaxies. I - Observations of twenty clusters: Physical correlations

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225...21m&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Oct. 1, 1978, p. 21-39.

Astronomy and Astrophysics

Astronomy

208

Data Correlation, Galactic Clusters, Oso-8, X Ray Astronomy, X Ray Spectra, Abundance, Bremsstrahlung, Galactic Structure, Iron, Spectrum Analysis, Spiral Galaxies, Stellar Luminosity, X Ray Sources

Scientific paper

OSO 8 X-ray spectra from 2 to 20 keV have been analyzed for 26 clusters of galaxies. For 20 clusters temperatures, emission integrals, iron abundances, and low-energy absorption measurements are presented. The data give, in general, better fits to thermal bremsstrahlung than to power-law models. Eight clusters have positive iron emission-line detections at the 90% confidence level, and all 20 cluster spectra are consistent with Fe/H = 0.000014 by number with the possible exception of Virgo. Thus it is confirmed that X-ray emission in this energy band is predominantly thermal radiation from hot intracluster gas rather than inverse Compton radiation. Physical correlations between X-ray spectral parameters and other cluster properties are examined. It is found that (1) the X-ray temperature is approximately proportional to the square of the velocity dispersion of the galaxies; (2) the emission integral is a strong function of the X-ray temperature; (3) the X-ray temperature and emission integral are better correlated with cluster central-galaxy density than with richness; and (4) the fraction of galaxies which are spirals is correlated with the observed ram pressure in the cluster core.

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