The gaseous Milky Way Halo
  In 1998 several papers claim the detection of an ubiquitous gaseous phase within the Galactic halo. Here we like to focus on the detections of X-ray emitting gas within the Galactic halo as well as the discovery of a pervasive neutral Galactic halo gas. We discuss critically the major differences between the recent publications as well as the limitations of the analyses. 
P.M.W. Kalberla, J. Kerp (Radioastronomisches Institut der Uni Bonn)