8th HEAD Meeting, 8-11 September, 2004
Session 26 AGN/Galactic Nuclei
Poster, Friday, September 10, 2004, 9:00am-10:00pm

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[26.08] Modulations of the redshifted Fe K emission in AGN and the implied black hole mass

K. Iwasawa, G. Miniutti, A.C. Fabian (IoA)

We report the tentative discovery of periodic, redshifted Fe K feature in the X-ray spectrum of an AGN. Transient, redshifted Fe K emission is sometimes found in AGN spectra in addition to the usual 6.4 keV line. It is often attributed to line emission arising from an inner radius of the accretion disk. The energy and intensity modulations of the feature we are studying suggest it to be Fe K emission arising from an illuminated spot in the relativistic region of a disk around a black hole. Its spectral evolution agrees with Fe K emission modulated by Doppler and gravitational effects as the spot orbits around. The location of the spot is constrained by the redshift of the feature, which is then combined with the orbital time to yield the black hole mass.

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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.