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Recent X-ray observations have shown broad, skewed iron line emission from Seyfert 1 galaxies, which is explained by the emission being fluorescence on a disc close to a black hole. During one interval, the Une in MCG-6-30-15 was so broad and redshifted that a Kerr black hole is implied. We are therefore studying the effects of the Kerr metric on the line profile, and extending the work by Laor an...

The profile and equivalent width of the X-ray iron emission line from a disc around a Kerr black hole