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arXiv 1106.2135astro-ph.HE
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Seyfert 1 AGN深朱雀观测中黑洞自旋的评估

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

摘要:

本文对Seyfert 1活动星系核Fairall 9、MCG-6 - 30 -15、NGC 3516、NGC 3783和NGC 4051的深朱雀观测资料进行了宽带分析。利用高信噪比的深层观测(曝光量>200千赫兹),可以充分研究这些物体的复杂光谱,同时考虑到软过剩、反射连续体和复杂吸收成分等特征。在对宽带数据(0.6-100.0 keV,也利用Swift的BAT数据)进行自洽建模之后,可能由于热吸收体而引入的微小曲率对能量>3 keV的光谱和Fe K区域产生了测量影响。形成一个模型(包括吸收),这些活动星系核允许的真实程度,扩大diskline发射是目前被检查,并作为一个结果的吸积盘和黑洞参数的测量是一致的,在整个0.6-100.0 keV的能量范围。拟合相对论性线发射模型似乎排除了在90%置信水平下所有物体中存在最大自旋黑洞的可能性,特别是MCG-6 - 30 -15在>99.5%置信水平下。相对论性铁K线发射在NGC 3516中只需要少量的,而在NGC 4051中不需要,在整个能量带通上。尽管如此,在Fairall 9,MCG-6 - 30 -15和NGC 3783中检测到统计上显著加宽的6.4 keV Fe K α发射,当与圆盘发射模型拟合时,分别产生a=0.67(+0.10,-0.11),a=0.4(+0.20,-0.12)和a<-0.04的黑洞自旋估计。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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