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Departmental Colloquium

Hot Gas in the Galactic Halo  
Guest Speaker
David Henley  
Guest Affiliation
UGA Physics and Astronomy  
Guest Affiliation Url  
Robin Shelton  
Thursday, April 11, 2013 4:00 pm - 5:00 pm  
Physics Auditorium (Rm 202)  

The Galactic halo, above and below the Galactic disk, is filled with gas
at ~1-3 million K. This gas is a major contributor to the diffuse soft
X-ray background (SXRB) in directions looking out of the Galactic disk. 
Despite many years of study, the origin of the hot halo gas remains
uncertain. X-ray spectroscopy of the SXRB emission enables us to
determine the physical conditions in the hot gas, providing clues to its
origin and evolution.

We have recently completed a survey of the SXRB using data from the  
orbiting XMM-Newton X-ray observatory. I will describe how we use the 
data from this survey to measure the halo's X-ray emission, and how we  
are using these results to test physical models for the origin of the
hot gas.