Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7892k&link_type=abstract
HST Proposal ID #7892
Other
Hst Proposal Id #7892 Agn And Quasars
Scientific paper
The geometry of BAL QSOs is highly uncertain. One class of popular models suggests that the broad absorption line material arises in a wind driven off the accretion disk or obscuring torus surrounding the QSO. An alternative model has the absorption produced by material in a jet directed along our line of sight. In the first case, we view the BAL QSO at high inclination through the wind with our line of sight near the plane of the disk or the torus. In the latter model, the inclination is low, and our line of sight through the jet is near the pole. We will obtain snapshot images of broad absorption line QSOs {BAL QSOs} in narrow band filters containing redshifted [O II], Hbeta, [O III] or Halpha to search for line emission indicative of extended narrow-line regions. If the geometry of the first hypothesis is correct, the line emission would appear as extended structures lying in the plane of the sky, similar to nearby Seyfert 2 galaxies. If the absorption arises in a jet, then presumably we are viewing the QSO along the axis of symmetry, and any extended emission would either be absent or distributed more symmetrically about the central source as is seen in nearby Seyfert 1s. If we scale the expected NLR of the typical BAL QSO to a size where the nuclear flux would have a comparable dilution in NGC 1068, we would expect it to cover 3 kpc with surface brightnesses of 2 to 60e-15 ergs/cm^2/s/arcsec^2 at z=2. For H_0=75 and q_0=0.5, the angular scale at z=2 is 5.46 kpc/arcsec, so any extended emission would cover 0.5'', and this would be well sampled by the NICMOS PSFs. The detection of extended emission-line gas structures in BAL QSOs would offer another means of investigating the BAL QSO phenomenon as well as establishing a new probe of material in galaxies at high redshift.
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