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We perform a systematic study of physical properties and distribution ofneutral and ionised gas in the halo of the Milky Way (MW). Beside the largeneutral intermediate- and high-velocity cloud (IVC, HVC) complexes there existsa population of partly ionised gaseous structures with low-column densitiesthat have a substantial area filling factor. The origin and nature of thesestructures are still under debate. We analyse the physical parameters of the MWhalo gas and the relation to quasar (QSO) metal-absorption line systems at lowand high redshifts. For this purpose we combine new HI 21-cm data from theEBHIS and GASS surveys with optical quasar absorption line data to study thefilling factor and distribution of these gaseous clouds in the halo at HIdensities below 10^19 1/cm^2. This study is important to understand theevolution of the MW in particular and the gas accretion mechanisms of galaxiesin general.

Absorption and emission line studies of gas in the Milky Way halo