Determining the Ionization Equilibrium and Abundances in Balqsos

Details Determining the Ionization Equilibrium and Abundances in Balqsos Determining the Ionization Equilibrium and Abundances in Balqsos

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6091a&link_type=abstract

HST Proposal ID #6091

Physics

Hst Proposal Id #6091 Quasars

Scientific paper

About 10% of all quasars show broad absorption lines (BALs) associated with resonance lines from abundant ions. Two important issues in the study of these objects are the determination of the ionization equilibrium and the determination of the chemical abundances that give rise to the observed BALs. Ground-based spectra by themselves are of limited value here. The main problem is that only about four BALs are typically observed from the ground, and each arises from a different element. Therefore, the effects of ionization levels and abundances cannot be separated. However, UV spectroscopy with the HST combined with ground-based spectra can cover BALs from more than one ion for some elements, in particular BALs from four ions of oxygen can be observed. This situation allows us to separate the two effects and hence to improve dramatically our understanding of both. Existing HST/FOS observations can contribute toward these goals, but the targets and exposures were never chosen with attempt to obtain optimized data to answer these questions. We propose to observe an object, for which the combination of brightness, structure of the absorption trough, length of exposure and spectral coverage, will give such optimized data. We will then use a carefully planned approach to determine the ionization equilibrium and abundances from these observations.

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