Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983stin...8333826m&link_type=abstract
Presented at the Workshop on Hot Astrophys. Plasmas, Nice, 8-10 Nov. 1982
Astronomy and Astrophysics
Astrophysics
Astronomical Spectroscopy, Emission Spectra, Galactic Clusters, Galactic Radiation, Line Spectra, X Ray Spectra, Bremsstrahlung, Cooling, Cosmic X Rays, Data Correlation, Equations Of State, Heao 1, Luminosity
Scientific paper
Some X-ray spectral observations of approximately 30 clusters of galaxies from HEAO-1 are summarized. There exists strong correlations between X-ray luminosity, L(x), and temperature kT in the form L(x)alphaT to the 2.3 power. This result combined with the L(x) central galaxy density relation and the virial theorem indicates that the core dadius of the gas should be roughly independent of L(x) or KT and that more luminous clusters have a greater fraction of their virial mass in gas. The poor correlation of KT and optical velocity dispersion seems to indicate that clusters have a variety of equations of state. There is poor agreement between X-ray imaging observations and optical and X-ray spectral measures of the polytropic index. Most clusters show Fe emission lines with a strong indication that they all have roughly 1/2 solar abundance. The evidence for cooling in the cores of several clusters is discussed based on spectral observations with the Einstein solid state spectrometer.
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