Interpretation of Departure from the Broad Line Region Scaling in Active
  Galactic Nuclei
  Most results of the reverberation monitoring of active galaxies showed a
universal scaling of the time delay of the Hbeta emission region with the
monochromatic flux at 5100 A, with very small dipersion. Such a scaling favored
the dust-based formation mechanism of the Broad Line Region (BLR). Recent
reverberation measurements showed that actually a significant fraction of
objects exhibits horter lags than the previously found scaling. Here we
demonstrate that these shorter lags can be explained by the old concept of
scaling of the BLR size with the ionization parameter. Assuming a universal
value of this parameter and universal value of the cloud density reproduces the
distribution of observational points in the time delay vs. monochromatic flux
plane, provided that a range of black hole spins is allowed. However, a
confirmation of the new measurements for low/moderate Eddington ratio sources
is strongly needed before the dust-based origin of the BLR can be excluded.
