Iron K alpha line profiles driven by non-axisymmetric illumination

Previous calculations of Fe K alpha line profiles are based on axisymmetric emissivity laws. In this paper, we show line profiles driven by non-axial symmetric illumination which results from an off-axis X-ray point source. W e find that source location and motion have significant effects on the red wing and blue horn of the line profiles. The disc region under the source w ill receive more flux, which is the most important factor to affect the lin e profiles. We suggest that at least part of the variation in Fe K alpha li ne profiles is caused by the motion of X-ray sources. Future observations o f Fe K alpha line profiles will provide more information about the distribu tion and motion of the X-ray sources around black holes, and hence the unde rlying physics.