Back to Volume
Paper: Absorption and Emission Line Studies of Gas in the Milky Way Halo
Volume: 438, The Dynamic Interstellar Medium: A Celebration of the Canadian Galactic Plane Survey
Page: 170
Authors: Bekhti, N. B.; Richter, P.; Winkel, B.; Kerp, J.; Kalberla, P. M. W.; Klein, U.; Murphy, M. T.
Abstract: We perform a systematic study of physical properties and distribution of neutral and ionised gas in the halo of the Milky Way (MW). Beside the large neutral intermediate- and high-velocity cloud (IVC, HVC) complexes there exists a population of partly ionised gaseous structures with low column densities that have a substantial area filling factor. The origin and nature of these structures are still under debate. We analyse the physical parameters of the MW halo gas and the relation to quasar (QSO) metal-absorption line systems at low and high redshifts. For this purpose we combine new HI 21-cm data from the EBHIS and GASS surveys with optical quasar absorption line data to study the filling factor and distribution of these gaseous clouds in the halo at HI densities below 1019 cm–2. This study is important to understand the evolution of the MW in particular and the gas accretion mechanisms of galaxies in general.
Back to Volume