Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.299..783h&link_type=abstract
Nature, vol. 299, Oct. 28, 1982, p. 783-788.
Astronomy and Astrophysics
Astronomy
18
High Temperature Gases, Interstellar Gas, Milky Way Galaxy, Quasars, Ultraviolet Absorption, X Ray Absorption, Absorption Spectra, Astronomical Models, Astronomical Spectroscopy, High Pressure, Spectral Line Width
Scientific paper
UV and soft X-ray observations of the hot interstellar gas in the disk and the halo (corona) of the Galaxy are reviewed. The observations are shown to indicate that the temperature of the hot disk gas is about 200,000 to 300,000 K and that the temperature of the hot halo gas is around 80,000 K. It is argued that the UV data imply a very low thermal pressure for the hot interstellar gas, while the X-ray data imply a very high pressure. Existing models of the hot disk gas and of the galactic corona (halo) are examined, and the observational properties of the corona are compared with narrow-line quasar absorption systems. It is concluded that the narrow-line absorption features of quasars may arise in a gas with properties similar to those of the 80,000-K galactic coronal gas.
Hartquist Thomas W.
Snijders A. J. M.
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