The Blueshifting and Baldwin effects for the [OIII] 5007 Emission Line
  in Type 1 Active Galactic Nuclei
  We use homogeneous samples of radio-quiet Seyfert 1 galaxies and QSOs
selected from the Sloan Digital Sky Survey to investigate the connection
between the velocity shift and the equivalent width (EW) of the [OIII] 5007
emission line, and their correlations with physical parameters of active
galactic nuclei (AGNs). We find a significant and negative correlation between
the EW of the core component, EW(core), and the blueshift of either the core
(the peak), the wing, or the total profile of [OIII] emission; it is fairly
strong for the blueshift of the total profile particularly. However, both
quantities (EW and velocity shift) generally have only weak, if any,
correlations with fundamental AGN parameters such as the nuclear continuum
luminosity at 5100 L_{5100}, black hole mass (M_{BH}), and the Eddington ratio
(L/L_{Edd}); these correlations include the classical Baldwin effect of
EW(core), an inverse Baldwin effect of EW(wing), and the relationship between
velocity shifts and \lratio. Our findings suggest that both the large
object-to-object variation in the strength of [OIII] emission and the
blueshift--EW(core) connection are not governed primarily by fundamental AGN
parameters such as L_{5100}, M_{BH} and L/L_{Edd}. We propose that the ISM
conditions of the host galaxies play a major role instead in the diversity of
the [OIII] properties in active galaxies. This suggests that the use of[OIII]
5007 luminosity as proxy of AGN luminosity does not depend strongly on the
above-mentioned fundamental AGN parameters.
