Properties of the narrow line Seyfert 1 galaxies revisited
  There is growing evidence to suggest that the black hole mass has been
previously underestimated with the H$\beta$ line width for certain active
galactic nuclei (AGN). With the assumption of the flatter rather than isotropic
velocity distribution of gases in the broad-line region of AGN, we investigated
the properties of narrow line Seyfert 1 (NLS1) galaxies, like the black hole
mass and the Eddington ratio, and compared with broad line Seyfert 1 (BLS1)
galaxies. Since gamma-rays detected in a few NLS1s which favor a smaller
viewing angle in NLS1s than BLS1s, with the projection effect we estimated the
relative black hole mass and Eddington ratio for NLS1s and BLS1s. The result
implies that the NLS1s and BLS1s have similar black hole masses and Eddington
ratios, peaked at a larger black hole mass and lower Eddington ratio for the
NLS1s than thought before. Furthermore, with applying the correction factor 6
of average black hole mass as derived from the modelling of both optical and UV
data in radio-loud NLS1s by Calderone et al., to the Xu et al. sample, we find
that the NLS1s and BLS1s also show similar black hole masses and Eddington
ratios, peaked at $2.0\times10^{7}M_{\odot}$ and 0.12 (Eddington ratio) for the
NLS1s. The $M_{BH}-\sigma$ relation due to the enhanced black hole masses of
NLS1s is discussed. In addition, there seems to show a linear correlation
between jet power and disk luminosity for the flat spectrum radio-loud NLS1
sample, which implies an accretion dominated rather than black hole spin
dominated jet.
