Oscillatory patterns in the light curves of 5 long-term monitored type 1
  AGN
  A new combined data of 5 well known type 1 AGN are probed with a novel hybrid
method in a search for oscillatory behavior. Additional analysis of artificial
light curves obtained from the coupled oscillatory models gives confirmation
for detected periods that could have physical background. We find periodic
variations in the long-term light curves of 3C 390.3, NGC 4151, NGC 5548 and
E1821+643, with correlation coefficients larger than 0.6. We show that
oscillatory patterns of two binary black hole candidates NGC 5548 and E1821+643
corresponds to qualitatively different dynamical regimes of chaos and
stability, respectively. We demonstrate that absence of oscillatory patterns in
Arp 102B could be due to a weak coupling between oscillatory mechanisms. This
is the first good evidence that 3C 390.3 and Arp 102B, categorized as
double-peaked Balmer line objects, have qualitative different dynamics. Our
analysis shows a novelty in the oscillatory dynamical patterns of the light
curves of these type 1 AGN.
