Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..768s&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Mar. 15, 1981, p. 768-776.
Astronomy and Astrophysics
Astronomy
50
Absorption Spectra, Galactic Structure, Interstellar Gas, Milky Way Galaxy, Quasars, Ultraviolet Astronomy, Carbon, Ferric Ions, Halos, Iue, Line Spectra, Magellanic Clouds, Magnesium, Metal Ions, Silicon, Spectral Line Width, Spectrum Analysis, Ultraviolet Spectra
Scientific paper
Milky Way halo and quasar absorption spectra contain a number of remarkable similarities which include mixed ion absorption, a general absence of excited fine structure levels with the possible exception of excited C II, similar column densities, and similar multicomponent line profiles. The extreme sensitivity of UV lines to small amounts of gas is well illustrated in a comparison of 21-cm H I emission with UV absorption toward the Large Magellanic Cloud. This sensitivity shows that galaxies are likely to appear significantly larger in UV absorption than in 21-cm emission and that the size problem for galactic halos is probably not a serious one. It is concluded that many of the absorption line systems seen in the spectra of quasars are probably produced in the gaseous halos of intervening galaxies.
Jeske N. A.
Savage Blair. D.
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