The composition of the interstellar medium towards the Lockman Hole - $\ion{H}{I}$, UV and X-ray observations

  title={The composition of the interstellar medium towards the Lockman Hole - \$\ion\{H\}\{I\}\$, UV and X-ray observations},
  author={Michael Kappes and Juergen Kerp and Philipp Richter},
  journal={Astronomy and Astrophysics},
The Lockman Hole is well known as the region with the lowest neutral atomic hydrogen column density on the entire sky. We present an analysis of the soft X-ray background radiation towards the Lockman Hole using ROSAT all-sky survey data. This data is correlated with the Leiden/Dwingeloo survey (Galactic $\ion{H}{i}$ 21 cm-line emission) in order to model the soft X-ray background by using radiative transfer calculations for four ROSAT energy bands simultaneously. It turns out, that an… 
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