Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5784a&link_type=abstract
HST Proposal ID #5784
Physics
Hst Proposal Id #5784 Quasars
Scientific paper
About 10 resonance lines of ions from abundant species. One of the prominent questions in the study of these objects is: What is the ionization equilibrium that gives rise to the observed BALs? For answering this question, ground-based spectra are of limited value. The main problem is that only about four BALs are typically observed from the ground {even in high redshift QSOs}, and each arises from a different element. Therefore, attempts at determining the ionization equilibrium from ground based spectra are foiled by too many free parameters. However, the HST {through UV spectroscopy} has already observed many more BALs in a few objects, and combined with ground-based spectra we now have data on BALs from two to four ions for each of the CNO elements. This situation can dramatically improve our understanding of the ionization equilibrium. We propose to perform a detailed analysis on the BALQSO data in the HST archive, in order to extract the column densities and attempt to determine the optical depth as a function of velocity for all these BALs. We then plan to use three of the available ionization codes to infer the intrinsic shape of the ionizing continuum, the ionization parameter and the abundance of different elements.
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