2005MNRAS.364..187B

We investigate the radial velocity difference between the narrow emission-line components of [Oiii]λ5007 and Hβ in a sample of 150 Sloan Digital Sky Survey narrow-line Seyfert 1 galaxies. Seven `blue outliers' with [Oiii] blueshifted by more than 250 km/s are found. A strong correlation between the [Oiii] blueshift and the Eddington ratio is found for these seven `blue outliers'. For the entire sample, we found a modest correlation between the blueshift and the linewidth of the narrow component of the [Oiii] line. The reflected profile of [Oiii] indicates two kinematically and physically distinct regions. The [Oiii] linewidth depends not only on the bulge stellar gravitational potential, but also on the central black hole potential.