Optical Variability of Narrow and Broad line Seyfert 1 galaxies
  We studied optical variability (OV) of a large sample of narrow-line Seyfert
1 (NLSy1) and broad-line Seyfert 1 (BLSy1) galaxies with z<0.8 to investigate
any differences in their OV properties. Using archival optical V-band light
curves from the Catalina Real Time Transient Survey that span 5-9 years and
modeling them using damped random walk, we estimated the amplitude of
variability. We found NLSy1 galaxies as a class show lower amplitude of
variability than their broad-line counterparts. In the sample of both NLSy1 and
BLSy1 galaxies, radio-loud sources are found to have higher variability
amplitude than radio-quiet sources. Considering only sources that are detected
in the X-ray band, NLSy1 galaxies are less optically variable than BLSy1
galaxies. The amplitude of variability in the sample of both NLSy1 and BLSy1
galaxies is found to be anti-correlated with Fe II strength but correlated with
the width of the H-beta line. The well-known anti-correlation of
variability-luminosity and the variability-Eddington ratio is present in our
data. Among the radio-loud sample, variability amplitude is found to be
correlated with radio-loudness and radio-power suggesting jets also play an
important role in the OV in radio-loud objects, in addition to the Eddington
ratio, which is the main driving factor of OV in radio-quiet sources.
