Star formation in a diffuse high-altitude cloud?
  A recent discovery of two stellar clusters associated with the diffuse
high-latitude cloud HRK 81.4-77.8 has important implications for star formation
in the Galactic halo. We derive a plausible distance estimate to HRK 81.4-77.8
primarily from its gaseous properties. We spatially correlate state-of-the-art
HI, far-infrared and soft X-ray data to analyze the diffuse gas in the cloud.
The absorption of the soft X-ray emission from the Galactic halo by HRK
81.4-77.8 is used to constrain the distance to the cloud. HRK 81.4-77.8 is most
likely located at an altitude of about 400 pc within the disk-halo interface of
the Milky Way Galaxy. The HI data discloses a disbalance in density and
pressure between the warm and cold gaseous phases. Apparently, the cold gas is
compressed by the warm medium. This disbalance might trigger the formation of
molecular gas high above the Galactic plane on pc to sub-pc scales.
