Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279l..35h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 279, April 15, 1984, p. L35-L37.
Astronomy and Astrophysics
Astrophysics
4
Absorption Spectra, Halos, Interstellar Gas, Ionized Gases, Quasars, Red Shift, Abundance, Disk Galaxies, Intergalactic Media, Milky Way Galaxy
Scientific paper
Although few high-redshift QSO narrow-line absorption systems show evidence of "mixed" ionization, the authors suggest that physical conditions in the gas containing moderately and highly ionized systems are basically similar to those in the "hot" galactic interstellar gas. They argue that the paucity of systems with absorption due to lowly ionized species is related to the absence of a cloud phase under the physical conditions appropriate to young galaxies. It is pointed out that Wolfe's observations showing that lowly ionized species become less prevalent at higher redshifts are not inconsistent with the view that the properties of the interstellar media in the haloes of intervening galaxies are determined by the same processes which control the properties of the halo gas in our own Galaxy.
Dyson John E.
Hartquist Thomas W.
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