On the abundance of metals and the ionization state in absorbing clouds toward QSOs

Details On the abundance of metals and the ionization state in absorbing clouds toward QSOs On the abundance of metals and the ionization state in absorbing clouds toward QSOs

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..116c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 116-123.

Astronomy and Astrophysics

Astrophysics

81

Abundance, Metallicity, Photoionization, Quasars, Ultraviolet Absorption, Carbon, Clouds, Intergalactic Media, Lyman Alpha Radiation, Oxygen, Silicon

Scientific paper

The authors present photoionization models for clouds of material illuminated by the integrated radiation of QSOs over a range of epochs and predict the column densities of the most abundant ions for clouds with N(H I) = 5×1016cm-2. For a wide density range, C III is predicted to have the highest column density of all metallic ions, and it is searched for in the z = 3.321 absorption system toward S5 0014+81. The observations set an upper limit of the metal-to-hydrogen ratio of 10-3.5 compared to the solar value. The authors discuss the likely ionization mechanism and ionization state of such clouds in light of a recent unified picture of the Lyman-α and metal line QSO absorption systems proposed by Tytler.

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