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Focusing on hard X-ray variability, we reanalyzed Suzaku data of Type ISeyfert galaxy MCG-6-30-15 obtained in 2006. Intensity-sorted spectroscopy anda principal component analysis consistently revealed a very hard component thatvaries independently of the dominant power-law emission. Although the exactnature of this hard component is not yet identified, it can be modeled as apower-law with a photon index ~2 affected by a partial covering absorption, oras a thermal Comptonization emission with a relatively large optical depth.When this component is included in the fitting model, the time-averaged 2.5-55keV spectrum of MCG-6-30-15 can be reproduced successfully by invoking a mildlybroadened iron line with its emission region located at > 8 times thegravitational radii from the central black hole, and a moderate reflection witha covering fraction of ~3.4. This result implies that the solution of a highlyspinning black hole in MCG-6-30-15, obtained by Miniutti et al. (2007, PASJ,59, S315) using the same Suzaku data, is a model dependent result.

Suzaku Discovery of a Hard Component Varying Independently of the Power-Law Emission in MCG-6-30-15