Iron K Reverberation in an Object with a Narrow Relativistic Fe K Line

Reverberation time lags have been observed in several AGN. The iron lineresponds to changes in the illuminating continuum with a delay comparable to thelight crossing time a few gravitational radii from the black hole. Objects sofar with iron K reverberation have broad relativistic lines with strong redwings, supporting their origin in relativistic reverberation. Not all observedAGN however have broad Fe K lines with strong red wings. If the relativisticreverberation hypothesis is correct, objects with a relatively narrow, butrelativistic, Fe K lines should show longer delays and narrower lagenergyprofiles. Here we propose to observe NGC 5506 to directly test this hypothesis.The new data will provide constraints on the black hole spin independently from spectroscopy and timing. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]