Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 59, Issue -, Pages S315-S325Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/59.sp1.S315
Keywords
galaxies : active; galaxies : individual (MCG-6-30-15); galaxies : Seyfert; X-rays : galaxies
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Funding
- Science and Technology Facilities Council [PP/D000955/1] Funding Source: researchfish
- STFC [PP/D000955/1] Funding Source: UKRI
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Suzaku has, for the first time, enabled the hard X-ray variability of the Seyfert 1 galaxy MCG -6-30-15 to be measured. The variability in the 14-45 keV band, which is dominated by a strong reflection hump, is quenched relative to that at a few keV. This directly demonstrates that the whole reflection spectrum is much less variable than the power-law continuum. The broadband spectral variability can be decomposed into two components - a highly variable power-law and constant reflection - as previously inferred from other observations in the 2-10 keV band. The strong reflection and high iron abundance give rise to a strong broad iron line, which requires the inner disc radius to be at about 2 gravitational radii. Our results are consistent with the predictions of the light bending model which invokes the very strong gravitational effects expected very close to a rapidly spinning black hole.
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