Broad Emission Lines in Active Galaxies: Horns, Bumps and Shoulders
have complex and highly structured profiles. We discuss, in the context of the discrete cloud model of the broad-line region, three possible mechanisms by which profile structure could be produced: irregularities in the radial luminosity distribution, flattened geometries and ionizing continuum variability. In each case, the structure produced has
Robinson, A. et al.
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