Ionization and Abundances in Intrinsic QSO Absorption-Line Systems

Details Ionization and Abundances in Intrinsic QSO Absorption-Line Systems Ionization and Abundances in Intrinsic QSO Absorption-Line Systems

1997-04-24

arxiv.org/abs/astro-ph/9704235v2

Astronomy and Astrophysics

Astrophysics

6 pages, LaTeX, to appear in ``Mass Ejection From AGN,'' eds. R. Weymann, I. Shlosman, N. Arav

Scientific paper

We discuss two aspects of the ionization and abundances in QSO intrinsic absorbers. First, we use the high-ionization doublet Ne VIII 770,780 to test the relationship between the UV line absorbers and the ``warm'' absorbers detected in soft X-rays. In one well-measured QSO with intrinsic z_a ~ z_e lines, UM 675, we estimate that the UV absorber has at least 10 times too little O VII and O VIII to produce the requisite bound-free edges at ~0.8 keV. Second, we show that firm lower limits on the metal-to-hydrogen abundances can be established even with no constraints on the ionization. Those lower limits are typically Z ~> Z_o and sometimes Z ~> 10 Z_o (e.g. for the BALs). We argue that QSO metallicities up to at least ~9 Z_o are consistent with the rapid early-epoch star formation expected in the cores of massive galaxies.

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