Unravelling Active Galactic Nuclei
  A complete flat-spectrum radio-loud sample of AGN includes a significant fraction of Seyfert-like AGN including a NLS1. Analysis of their optical spectra suggests that the reddest continuum colours are either associated with AGN in nearby resolved galaxies, or distant quasars showing relatively narrow permitted emission lines. 
A.Y.K.N. Oshlack (1), R.L. Webster (1), M.J. Drinkwater (1), M.T.   Whiting(1), P.J. Francis(2), F.J. Masci(3) ((1) Universi...