A New Orientation Indicator for Radio-Quiet Quasars
  The velocities of the [O III] 5007 and optical Fe II emission lines, measured
relative to the systemic redshifts of 2265 QSOs by Hu et al. (2008), show the
signature of a disklike BLR structure with polar outflows. Objects with large
[O III] outflows show no Fe II offset velocity and are seen pole-on. Objects
with large Fe II inflow show no [O III] offset velocity and are seen edge-on.
This interpretation is supported by the morphology of the radio-loud objects
within the sample and by previous determinations of the geometry of the broad
and narrow line regions. Analysis of the objects with neither Fe II or [O III]
velocity offsets, however, show that the two groups also differ in Eddington
ratio, and, within this subset, corresponding groups with high and low
Eddington ratio but with the opposite orientation can be identified. Using
these four subsets of the sample, the effects of orientation and Eddington
ratio can be separated, and, in some cases, quantified. The changes in apparent
continuum luminosity and broad H-beta width and strength suggest a model in
which both continuum and H-beta are emitted from the surface of the disk, which
is less flattened in high Eddington ratio objects. The effects of orientation
on the derived properties, black hole mass and Eddington ratio, are
significant, though not large. The [O III] outflow appears to influence the
width of that line, as well as its centroid.
