Intermediate Velocity Gas in the Northern Galactic Hemisphere

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Session 114 -- Multi-Phase Interstellar Medium
Display presentation, Saturday, January 15, 9:30-6:45, Salons I/II Room (Crystal Gateway)

[114.08] Intermediate Velocity Gas in the Northern Galactic Hemisphere

K.D.Kuntz and L.Danly (Space Telescope Science Institute)

The bulk of the intermediate velocity gas in the northern galactic hemisphere is contained in a few large complexes whose masses are about 10$^{5}$M$_\odot$ These complexes are formed of large clumps (masses of about 10$^{3}$M$_\odot$) surrounded by a lower column density "envelope". Both the clumps and the envelope follow distinct velocity trends that appear to relate gas at nearly -100 km/s to gas at only -20 km/s. There is some evidence for a phenomenological connection between an intermediate velocity complex (the Intermediate Velocity Arch) and the High Velocity Complex M. The morphology, distances, and masses of the intermediate velocity gas are used to constrain models of its origins.

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