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Since the discovery of the first broad iron-K line in 1995 from the SeyfertGalaxy MCG--6-30-15, broad iron-K lines have been found in several otherSeyfert galaxies, from accreting stellar mass black holes and even fromaccreting neutron stars. The iron-K line is prominent in the reflectionspectrum created by the hard X-ray continuum irradiating dense accretingmatter. Relativistic distortion of the line makes it sensitive to the stronggravity and spin of the black hole. The accompanying iron-L line emissionshould be detectable when the iron abundance is high. Here we report the firstdiscovery of both iron-K and L emission, using XMM-Newton observations of theNarrow-Line Seyfert 1 Galaxy 1H0707-495. The bright Fe-L emission has enabledus, for the first time, to detect a reverberation lag of 30 s between thedirect X-ray continuum and its reflection from matter falling into the hole.The observed reverberation timescale is comparable to the light-crossing timeof the innermost radii around a supermassive black hole. The combination ofspectral and timing data on 1H0707-495 provides strong evidence that we arewitnessing emission from matter within a gravitational radius, or a fraction ofa light-minute, from the event horizon of a rapidly-spinning, massive blackhole.

The detection of Broad Iron K and L line emission in the Narrow-Line Seyfert 1 Galaxy 1H0707-495 using XMM-Newton