A long, hard look at MCG–6-30-15 with XMM-Newton

Vaughan, S.; Fabian, A. C.; Iwasawa, K.; Turner, Adrian K.

doi:10.1016/j.nuclphysbps.2004.04.044

Cited by 1 publication

(1 citation statement)

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“…To disentangle the model degeneracy, identifying the underlying spectral components in a model independent manner is critically important. For this purpose, many works, such as statistical and timing analyses, have been performed so far (e.g., Taylor et al 2003;Vaughan et al 2004;Miller et al 2009). However, due to lack of sensitivity in the energy band in > ∼ 15 keV, few of them focused on the hard X-ray variability.…”

Section: Introductionmentioning

confidence: 99%

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

Noda¹,

Makishima²,

Uehara³

et al. 2011

Publications of the Astronomical Society of Japan

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Focusing on hard X-ray variability, we reanalyzed Suzaku data of Type I Seyfert galaxy MCG-6-30-15 obtained in 2006. Intensity-sorted spectroscopy and a principal component analysis consistently revealed a very hard component that varies independently of the dominant power-law emission. Although the exact nature of this hard component is not yet identified, it can be modeled as a power-law with a photon index ∼ 2 affected by a partial covering absorption, or as a thermal Comptonization emission with a relatively large optical depth. When this component is included in the fitting model, the time-averaged 2.5-55 keV spectrum of MCG-6-30-15 can be reproduced successfully by invoking a mildly broadened iron line with its emission region located at > ∼ 8 times the gravitational radii from the central black hole, and a moderate reflection with a covering fraction of ∼ 3.4π. This result implies that the solution of a highly spinning 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.

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Section: Introductionmentioning

confidence: 99%