A comparative study of the physical properties for a representative
  sample of Narrow and Broad-line Seyfert galaxies
  We present a comparative study of the physical properties of a homogeneous
sample of 144 Narrow line Seyfert 1 (NLSy1) and 117 Broad-line Seyfert 1
(BLSy1) galaxies. These two samples are in a similar luminosity and redshift
range and have optical spectra available in the 16$^{th}$ data release of Sloan
Digital Sky Survey (SDSS-DR16) and X-ray spectra in either XMM-NEWTON or ROSAT.
Direct correlation analysis and a Principal Component Analysis (PCA) have been
performed using ten observational and physical parameters obtained by fitting
the optical spectra and the soft X-ray photon indices as another parameter. We
confirm that the established correlations for the general quasar population
hold for both types of galaxies in this sample despite significant differences
in the physical properties. We characterize the sample also using the line
shape parameters, namely the asymmetry and kurtosis indices. We find that the
fraction of NLSy1 galaxies showing outflow signatures, characterized by blue
asymmetries, is higher by a factor of about 3 compared to the corresponding
fraction in BLSy1 galaxies. The presence of high iron content in the broad-line
region of NLSy1 galaxies in conjunction with higher Eddington ratios can be the
possible reason behind this phenomenon. We also explore the possibility of
using asymmetry in the emission lines as a tracer of outflows in the inner
regions of Active Galactic Nuclei. The PCA results point to the NLSy1 and BLSy1
galaxies occupying different parameter spaces, which challenges the notion that
NLSy1 galaxies are a subclass of BLSy1 galaxies.
