Absorption line systems in QSO spectra - Properties derived from observations and from photoionization models

Details Absorption line systems in QSO spectra - Properties derived from observations and from photoionization models Absorption line systems in QSO spectra - Properties derived from observations and from photoionization models

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...169....1b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 169, no. 1-2, Nov. 1986, p. 1-13.

Astronomy and Astrophysics

Astrophysics

146

Absorption Spectra, Photoionization, Quasars, Red Shift, Abundance, Gravitational Lenses, Halos, Heavy Elements, Lyman Spectra

Scientific paper

The authors discuss the physical properties of sharp metal-rich absorption line systems observed in QSO spectra at redshifts smaller than the QSO emission redshifts. They find that a main parameter distinguishing the high excitation systems (C IV absorption detected but not C II) from the low excitation ones (strong C IV and C II absorptions) is their H I column density. It is suggested that opacity to UV ionizing radiation is the determining factor for the two classes of absorption line systems. Several grids of photoionization models have been built, in which the ionizing source is the diffuse UV background. The authors have found that at high z, the absorbing clouds have about the same temperature and gas densities as the ones found in our Galaxy, but they differ in their ionization level. In order to determine whether there is some continuity in the properties of the absorbers with redshift and to definitively link the absorption line systems with galaxies, the authors plead for a survey of C IV absorption systems at low z.

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