Correlation between the densities of X-ray sources and interstellar gas

@article{Fujimoto1969CorrelationBT,
  title={Correlation between the densities of X-ray sources and interstellar gas},
  author={Mitsuaki Fujimoto and Satio Hayakawa and T. Kato},
  journal={Astrophysics and Space Science},
  year={1969},
  volume={4},
  pages={64-83}
}
The distribution of X-ray sources in our galaxy is obtained, assuming that the absolute X-ray luminosities of these sources are the same. The distribution is found to be in good correlation with the distribution of interstellar gas. The density of X-ray sources is nearly proportional to the square density of gas. This indicates that X-ray sources are comparatively young. The relation between the densities of X-ray sources and gas allows us to estimate the X-ray intensities of various objects… 
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