Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1401w&link_type=abstract
American Astronomical Society, HEAD meeting #9, #14.01; Bulletin of the American Astronomical Society, Vol. 38, p.377
Other
Scientific paper
I will review recent studies of the hot gaseous medium in and around nearby disk galaxies. This medium represents a reservoir of materials required for lasting star formation, a depository of energetic stellar feedback, and an interface between the interstellar and intergalactic media. Observationally, it has become clear that X-ray emitting/absorbing gas around the galaxies originates predominately in galactic disks and bulges. This gas does not extend more than a few kpc away from galactic disks, except in nuclear starburst galaxies. However, the inferred energy, mass, and metal contents of the gas are far less than the expected supernova energy inputs. So there is a "missing stellar feedback'' problem. On the other hand, evidence for a large-scale hot gaseous halo around our Galaxy to explain various high-velocity clouds is mounting. The theoretical argument for the ongoing intergalactic gas accretion onto disk galaxies is also compelling. I will discuss possible solutions that reconcile these facts.
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