Where Does the Disk Turn Into the Halo? Cool H I in the Outer Milky Way Disk

Details Where Does the Disk Turn Into the Halo? Cool H I in the Outer Milky Way Disk Where Does the Disk Turn Into the Halo? Cool H I in the Outer Milky Way Disk

2009-01-16

arxiv.org/abs/0901.2379v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

5 pages, 3 figures, Conference Proceedings "The Role of Disk-Halo Interaction in Galaxy Evolution, Outflow vs. Infall?" ed. M.

Scientific paper

Using H I absorption spectra taken from the recent surveys of 21-cm line and continuum emission in the Galactic plane, the distribution of cool atomic clouds in the outer disk of the Milky Way is revealed. The warp of the midplane is clearly seen in absorption, as it is in emission, and the cool, neutral medium also shows flaring or increase in scale height with radius similar to that of the warm atomic hydrogen. The mixture of phases, as measured by the fraction of H I in the cool clouds relative to the total atomic hydrogen, stays nearly constant from the solar circle out to about 25 kpc radius. Assuming cool phase temperature ~50 K this indicates a mixing ratio of 15% to 20% cool H I, with the rest warm.

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