Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7359j&link_type=abstract
HST Proposal ID #7359
Other
Hst Proposal Id #7359 Agn/Quasars
Scientific paper
We propose to obtain low resolution near-UV spectra of a sample of eight low and moderate redshift {z = 0.45 to z = 1.71} BALQSOs to determine chemical abundances in the BAL region. These observations will provide many of the column densities needed for comparison with photoionization models. Low and moderate redshift BALQSOs are useful because the absorption troughs are easier to interpret since the Lyman alpha forest is less dense at low redshifts. For these objects, most of the absorption lines of interest lie in the near-UV part of the spectrum which can only be observed with HST. Observations of other BALQSOs have suggested very high metal abundances {Turnshek et al. 1996}, or moderately high metal abundances {Korista et al. 1996}. Moderately high metal abundances could be the result of rapid star formation {Hamann and Ferland, 1993}. HST/FOS observations of the BALQSO PG 0946+301 {z = 1.223} indicate a probable overabundance of phosphorous {Junkkarinen et al. 1995} which is too large to be consistent with rapid star formation models. The overabundance of phosphorous relative to other metals has been interpreted as due to novae {Shields 1996}. These observations are designed to test the possible models for high metallicity in BALQSOs and, indirectly, test the origins of the BAL phenomenon.
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