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Assessing black hole spin in deep Suzaku observations of Seyfert 1 AGN | A. R. Patrick
; J. N. Reeves
; A. P. Lobban
; D. Porquet
; A. G. Markowitz
; | Date: |
10 Jun 2011 | Abstract: | We present a broad-band analysis of deep Suzaku observations of nearby
Seyfert 1 AGN: Fairall 9, MCG--6-30-15, NGC 3516, NGC 3783 and NGC 4051. The
use of deep observations (exposures >200 ks) with high S/N allows the complex
spectra of these objects to be examined in full, taking into account features
such as the soft excess, reflection continuum and complex absorption
components. After a self-consistent modelling of the broad-band data (0.6-100.0
keV, also making use of BAT data from Swift), the subtle curvature which may be
introduced as a consequence of warm absorbers has a measured affect upon the
spectrum at energies >3 keV and the Fe K region. Forming a model (including
absorption) of these AGN allows the true extent to which broadened diskline
emission is present to be examined and as a result the measurement of accretion
disc and black hole parameters which are consistent over the full 0.6-100.0 keV
energy range.
Fitting relativistic line emission models appear to rule out the presence of
maximally spinning black holes in all objects at the 90% confidence level, in
particular MCG--6-30-15 at >99.5% confidence. Relativistic Fe K line emission
is only marginally required in NGC 3516 and not required in NGC 4051, over the
full energy bandpass. Nonetheless, statistically significant broadened 6.4 keV
Fe K alpha emission is detected in Fairall 9, MCG--6-30-15 and NGC 3783
yielding black hole spin estimates of a=0.67(+0.10,-0.11), a=0.4(+0.20,-0.12)
and a<-0.04 respectively, when fitted with disc emission models. | Source: | arXiv, 1106.2135 | Services: | Forum | Review | PDF | Favorites |
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