Other
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1156..246s&link_type=abstract
THE LOCAL BUBBLE AND BEYOND II: Proceedings of the International Conference. AIP Conference Proceedings, Volume 1156, pp. 246-2
Other
Galactic Halos, X-Ray, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Supernova Remnants, Interplanetary Magnetic Fields
Scientific paper
The properties of the hot gas in the Milky Way's halo are reviewed. The plasma's distribution is discerned from observations of O VI ions and 1/4 keV and 3/4 keV X-rays. Most of the hot gas is located within a few kpc of the disk. The T~3×105 K gas has a patchy distribution, while the T = 2 to 3×106 K gas has a smoother distribution. The density and pressure of the hot gas above the Galactic disk have been determined (ne~0.01 to ~0.02 cm-3 and Pth/k~7000 to 10,000 K cm-3, respectively). With its large pressure, the gas above the disk significantly compresses the gas in the disk. The plasma's cooling rate has been found to be large, suggesting that the hot halo plasma acts as a radiator for the disk/halo system. Several possible sources for the hot gas are considered. These include superbubbles and supernova remnants, Galactic winds, accreting IGM, and infalling high velocity clouds. Multiple mechanisms are probably at work. The review ends with a highlight of new trends.
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