Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145...59b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 1, April 1985, p. 59-69.
Astronomy and Astrophysics
Astrophysics
33
Absorption Spectra, Cosmology, Ionization, Quasars, Red Shift, Iron, Lyman Alpha Radiation, Magnesium, Radiant Flux Density, Wavelengths
Scientific paper
The authors present observations in the red of Mg II and Fe II absorptions in 18 QSOs known to contain C IV absorption systems. They have found an anti-correlation between the strength of the C IV or Mg II absorption lines and the degree of excitation of the absorbers. This partly accounts for the rareness of Mg II systems as compared to C IV. Physical properties of the absorbers are derived from a curve of growth analysis. The authors have not found any evidence for a strong cosmological evolution in the number density of Mg II absorption lines when comparing their results to data obtained at lower redshift. It is shown that a two-phase model for the absorbers is compatible with a different cosmological evolution for the low and high excitation systems.
Bergeron Jacqueline
Boisse Patrick
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