Soft X-ray structure of the Coma cluster of galaxies

Details Soft X-ray structure of the Coma cluster of galaxies Soft X-ray structure of the Coma cluster of galaxies

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230...26g&link_type=abstract

Astrophysical Journal, Part 1, vol. 230, May 15, 1979, p. 26-34.

Astronomy and Astrophysics

Astronomy

30

Astronomical Maps, Galactic Clusters, Galactic Radiation, X Ray Astronomy, Galactic Structure, Spatial Distribution, Spectrum Analysis, X Ray Sources

Scientific paper

Results are reported for an observation of the Coma cluster with an imaging X-ray telescope system aboard a sounding rocket. A two-dimensional X-ray map of the cluster in the energy range from 0.15 to 2.0 keV is presented. The radial distribution, granularity, and ellipticity of the X-ray surface brightness are investigated, and the spectrum and flux within the field of view are analyzed. These properties are then examined quantitatively by comparing the observations with models through the use of a chi-squared test. It is found that: (1) no single galaxy contributes more than a few percent of the total X-ray flux of the Coma cluster; (2) the X-ray source is diffuse but granular on a scale of several arcmin, particularly in the central region; (3) the centroid of the X-ray source is at a local intensity minimum; and (4) the data are most consistent with an isothermal hydrostatic model.

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