PHOTON ESCAPE CONES IN THE KERR FIELD

Solid angles spanning the directions along which photons can escape to infinity from a given point in the Kerr space are found with respect to the local stationary observers. The knowledge of the ''photon escap e cones'' allows one to plot the outline of the Kerr source as seen by such observers. The results obtained are consistent with the expectat ion of the effects of frame dragging in rotating black hole geometries , whereas those for naked singularities are more complicated and less intuitive.