Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..186v&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 186-190
Astronomy and Astrophysics
Astronomy
29
Absorption Spectra, Astronomical Spectroscopy, Far Ultraviolet Radiation, H Lines, High Temperature Gases, Metal Ions, Quasars, Ultraviolet Astronomy, Abundance, Lyman Spectra, Spaceborne Astronomy
Scientific paper
We show that some high-redshift QSO absorption systems that reveal only the H I Lyman series lines at wavelengths visible from the ground maybe a new class of ultra-high-ionization metal line systems, with metal lines in the far-UV region which is now being explored with satellites. At high temperatures or in intense radiation fields metal systems will not show the usual C IV absorption, and O VI will become the most prominent metal absorber. At still higher ionization, O IV also becomes weak and the strongest metal lines are from Ne VIII, Mg X and Si XII, which have doublets in the rangs 500-800 A. Hence very high ionization metal systems will not show metal lines in existing spectra. Recent X-ray observations show that galaxy halos contain hot gas, so we predict that far-UV spectra of QSOs will also show this gas.
Barthel Peter D.
Tytler David
Verner Dmitri A.
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