Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8284k&link_type=abstract
HST Proposal ID #8284
Physics
Hst Proposal Id #8284 Agn Physics
Scientific paper
A major goal in the study of AGN outflows is the determination of the ionization equilibrium and abundances {IEA} in broad absorption line {BAL} QSOs. In the last few years it has become clear that partial coverage of the continuum source and saturation are common in BALs, and these frustrate attempts to determine the IEA from available HST data because of limitations imposed by the S/N ratio and spectral coverage. We therefore propose to reobserve the most suitable BAL IEA target: PG 0946+301. These observations will allow us to measure saturation using at least six different diagnostics, and therefore derive real column densities. The wide UV spectral coverage will enable us to measure several occurrences of BALs from different ions of the same element which are the key to determining the IEA of the flow. In addition, the combined STIS/FOS data will yield the first possibility of detecting BAL variability in the rest-frame far UV, and the data on the highest ionizatio n BALs will shed light on the connection between the BAL and warm absorber phenomena. This proposal is a crucial part of a multiwavelength campaign on PG 0946+301 which also includes ASCA, FUSE and ground-based observations. Taken together, we believe these data will revolutionize our understanding of quasar outflows.
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