  Double peaked broad emission lines in active galactic nuclei are generally
considered to be formed in an accretion disc. In this paper, we compute the
profiles of reprocessing emission lines from a relativistic, warped accretion
disc around a black hole in order to explore the possibility that certain
asymmetries in the double-peaked emission line profile which can not be
explained by a circular Keplerian disc may be induced by disc warping. The disc
warping also provides a solution for the energy budget in the emission line
region because it increases the solid angle of the outer disc portion subtended
to the inner portion of the disc. We adopted a parametrized disc geometry and a
central point-like source of ionizing radiation to capture the main
characteristics of the emission line profile from such discs. We find that the
ratio between the blue and red peaks of the line profiles becoming less than
unity can be naturally predicted by a twisted warped disc, and a third peak can
be produced in some cases. We show that disc warping can reproduce the main
features of multi-peaked line profiles of four active galactic nuclei from the
Sloan Digital Sky Survey.
