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Global properties of the H I distribution in the outer Milky Way - Planar and extra-planar gas

Context. The determination of the global structure of the planar and extra-planar Milky Way H i disk depends critically on a reliable database but also on reasonable assumptions about the shape of the Milky Way rotation curve. Aims. We derive the 3D H i volume density distribution for the Galactic disk out to R ∼ 60 kpc. Methods. Our analysis is based on parameters for the warp and rotation curve derived previously. The data are taken from the Leiden/Argentine/Bonn all sky 21 cm line survey. Results. The Milky Way H i disk is significantly warped but shows a coherent structure out to R ∼ 35 kpc. The radial surface density distribution, the densities in the middle of the warped plane, and the H i scale heights all follow exponential relations. The radial scale length for the surface density distribution of the H i disk is 3.75 kpc. Gas at the outskirts for 40 15 kpc there is more gas in the south. The H i flaring indicates that this asymmetry is caused by a dark matter wake, located at R ∼ 25 kpc in direction of the Magellanic System. Conclusions. The H i disk is made up of two major components. Most prominent is the normal H i disk which can be traced to R ∼ 35 kpc. This is surrounded by a patchy distribution of highly turbulent gas reaching large scale heights but also large radial distances. At the position of the Sun the exponential scale height in the z direction is 3.9 kpc. This component resembles the anomalous gas discovered previously in some galaxies.