Mathematics – Probability
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5456t&link_type=abstract
HST Proposal ID #5456
Mathematics
Probability
Hst Proposal Id #5456 Quasars &Amp, Agn Quasar Absorption
Scientific paper
About 10% of all radio quiet QSOs exhibit broad absorption lines (BALs) in their spectra. The BALs come from a mostly highly ionized region outflowing from the central source at speeds up to many tens of thousands of km/s. Analysis based on resonance line scattering models suggests that BAL region covering factors are normally < 0.2. However, recent analysis of radio quiet QSO spectra with weak narrow-line [OIII] emission and strong FeII emission indicates that this special class of QSOs has a high probability of exhibiting BALs. Since narrow-line [OIII] emission is alsmost certainly emitted isotropically, this argues for large BAL region covering factors in this special class of QSOs. Note that the low covering factor models are consistent with scenarios where most QSOs have BAL regions, while high covering factor models are consistent with scenarios where there are special classes of QSOs with BAL region outflows. Using HST FOS and archived IUE or HST data when possible, we propose to explore the details of this recent finding by searching for BALs in a complete sample of 20 QSOs with weak narrow-line [OIII] emission and strong FeII emission. The nature of 6 or the 20 objects has been determined so far, and 4 of them have BALs. We request time to observe the remaining 14 objects. This work has immediate implications for understanding the evolutionary properties of QSOs and QSO geometries.
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