Theories of Halo Gas Energetics

Details Theories of Halo Gas Energetics Theories of Halo Gas Energetics

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.3302s&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #33.02; Bulletin of the American Astronomical Society, Vol. 34, p.687

Astronomy and Astrophysics

Astronomy

Scientific paper

Gaseous galactic halos have come to our attention because of their optical emission, UV absorption lines, and X-ray emission. A fundamental problem for the understanding of gaseous halos is the nature of energy sources that heat and ionize the warm gas and create the hot gas. Most of the energy sources in galaxies, e.g. hot stars and supernova remnants, are primarily confined to a relatively thin disk ( ~several hundred pc) in contrast to the thick ( ~1-several kpc) distribution of gas in halos. The problem with these disk sources is the transport of the energy from the disk to the halo. Several theories have been put forward for energy sources local to the halos, however it is unclear if these sources are capable of supplying the energy needed to maintain the heating and ionization observed. I will discuss theories for the nature of the energy sources for gaseous halos and for the transport of energy from galactic disks to halos.

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