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arXiv 1001.0356astro-ph.HE
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1型AGN NGC 5548中铁K发射线的朱雀监测

Suzaku Monitoring of the Iron K Emission Line in the Type 1 AGN NGC 5548

Yuan Liu, Martin Elvis, Ian M. McHardy, Dirk Grupe, Belinda J. Wilkes, James Reeves, Nancy Brickhouse, Yair Krongold, Smita Mathur, Takeo Minezaki, Fabrizio Nic… 展开作者

Yuan Liu, Martin Elvis, Ian M. McHardy, Dirk Grupe, Belinda J. Wilkes, James Reeves, Nancy Brickhouse, Yair Krongold, Smita Mathur, Takeo Minezaki, Fabrizio Nicastro, Yuzuru Yoshii, Shuang Nan Zhang

摘要:

2007年利用\textit{Suzaku} X射线成像光谱仪(XIS)和硬X射线探测器(HXD)对NGC 5548进行了连续7周的观测。在所有7次观测中均检测到铁K PDMATHAMN线,在4次观测中也检测到K PDMATHAMO线。在本文中,我们调查的Fe K线的起源使用线的宽度和混响映射方法。通过XIS和HXD谱的叠加,我们分别在6.396 $_{-0.007}^{+0.009}$ keV和7.08 $_{-0.05}^{+0.05}$ keV处确定了Fe K $α$和K $β$谱线。从共加光谱获得的线宽为38 $_{-18}^{+16}$ eV($\textrm{FWHM}=4200_{-2000}^{+1800}$ km/s),对应于NCG 5548中$1.220\times10^7$ M $_{\odot}$维里产生的20 $_{-10}^{+50}$光日的半径。为了定量研究的起源窄Fe线的混响映射方法,我们比较了观测到的光变曲线的Fe K $α$线与预测的,这是通过卷积的连续光变曲线的传递函数在薄壳和倾斜的磁盘。最佳拟合结果由具有$i=30^\circ$的盘盒给出,其优于在92.7%水平下对Fe K线的恒定通量的拟合(F检验)。我们发现由光变曲线得到的发射半径为25-37光日,这与由Fe K线宽度得到的半径是一致的。结合谱线宽度和变化的结果,窄铁谱线最有可能的起源地点是距离中央引擎20-40光日,尽管其他可能性也没有完全排除。(节略)

英文摘要:

We present 7 sequential weekly observations of NGC 5548 conducted in 2007 with the \textit{Suzaku} X-ray Imaging Spectrometer (XIS) in the 0.2-12 keV band and Hard X-ray Detector (HXD) in 10-600 keV band. The iron K$α$ line is well detected in all seven observations and K$β$ line is also detected in four observations. In this paper, we investigate the origin of the Fe K lines using both the width of the line and the reverberation mapping method. With the co-added XIS and HXD spectra, we identify Fe K$α$ and K$β$ line at 6.396$_{-0.007}^{+0.009}$ keV and 7.08$_{-0.05}^{+0.05}$ keV, respectively. The width of line obtained from the co-added spectra is 38$_{-18}^{+16}$ eV ($\textrm{FWHM}=4200_{-2000}^{+1800}$ km/s) which corresponds to a radius of 20$_{-10}^{+50}$ light days, for the virial production of $1.220\times10^7$ M$_{\odot}$ in NCG 5548. To quantitatively investigate the origin of the narrow Fe line by the reverberation mapping method, we compare the observed light curves of Fe K$α$ line with the predicted ones, which are obtained by convolving the continuum light curve with the transfer functions in a thin shell and an inclined disk. The best-fit result is given by the disk case with $i=30^\circ$ which is better than a fit to a constant flux of the Fe K line at the 92.7% level (F-test). We find that the emitting radius obtained from the light curve is 25-37 light days, which is consistent with the radius derived from the Fe K line width. Combining the results of the line width and variation, the most likely site for the origin of the narrow iron lines is 20-40 light days away from the central engine, though other possibilities are not completely ruled out. (abridged)

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