A simplified view of blazars: the gamma-ray case
  We have recently proposed a new simplified scenario where blazars are
classified as flat-spectrum radio quasars (FSRQs) or BL Lacs according to the
prescriptions of unified schemes, and to a varying combination of Doppler
boosted radiation from the jet, emission from the accretion disk, the broad
line region, and light from the host galaxy. Here we extend our approach,
previously applied to radio and X-ray surveys, to the gamma-ray band and,
through detailed Monte Carlo simulations, compare our predictions to Fermi-LAT
survey data. Our simulations are in remarkable agreement with the overall
observational results, including the percentages of BL Lacs and FSRQs, the
fraction of redshift-less objects, and the redshift, synchrotron peak, and
gamma-ray spectral index distributions. The strength and large scatter of the
oft-debated observed Gamma-ray -- radio flux density correlation is also
reproduced. In addition, we predict that almost 3/4 of Fermi-LAT BL Lacs, and
basically all of those without redshift determination, are actually FSRQs with
their emission lines swamped by the non-thermal continuum and as such should be
considered. Finally, several of the currently unassociated high Galactic
latitude Fermi sources are expected to be radio-faint blazars displaying a pure
elliptical galaxy optical spectrum.
