论文标题
一个未吸收的窄线和宽线塞弗特1个星系的蓝饰样品：I。X射线光谱特性
A Suzaku sample of unabsorbed narrow-line and broad-line Seyfert 1 galaxies: I. X-ray spectral properties
论文作者
论文摘要
提出了一个窄线（NLS1）和宽线seyfert 1（BLS1）星系的样本。最终样本由22个NLS1和47 BLS1组成，总共69个AGN均处于低红移（z <0.5）（z <0.5），并且显示低宿主星系柱密度（<10^22 cm^-2）。每个物体的平均光谱与玩具模型拟合，以表征重要参数，包括光子指数，软过量，康普顿驼峰（或硬过量），窄铁线强度，发光度和X射线爱丁顿比率（L_X/L_EDD）。我们证实了先前的发现，NLS1具有更陡峭的功率定律和更高的X射线爱丁顿比率，但也发现NLS1星系比BLS1的星系具有更强的软和硬过量。研究参数之间的相关性表明，对于NLS1星系，软过量和硬过量相关，而对于BLS1，则没有观察到这种相关性。在测得的X射线参数上执行主成分分析（PCA）表明，X射线Eddington比率是我们样本中变化的主要来源（PC1）（PC1），但软和硬过量的变化构成了第二个主成分（PC2），并且由NLS1S主导。 NLS1星系中软和硬过量之间的相关性可能表明这两个组件的共同起源，例如模糊的反射模型。提出的Seyfert 1星系样品是分析AGN X射线特性的有用工具，以及在AGN中观察到的软和硬过量的研究。
A sample of narrow-line (NLS1) and broad-line Seyfert 1 (BLS1) galaxies observed with Suzaku is presented. The final sample consists of 22 NLS1s and 47 BLS1s, for a total of 69 AGN that are all at low redshift (z<0.5) and exhibit low host galaxy column densities (<10^22 cm^-2). The average spectrum for each object is fit with a toy model to characterise important parameters, including the photon index, soft excess, Compton hump (or hard excess), narrow iron line strength, luminosity and X-ray Eddington ratio (L_x/L_Edd). We confirm previous findings that NLS1s have steeper power laws and higher X-ray Eddington ratios, but also find that NLS1 galaxies have stronger soft and hard excesses than their BLS1 counterparts. Studying the correlations between parameters shows that the soft and hard excesses are correlated for NLS1 galaxies, while no such correlation is observed for BLS1s. Performing a principal component analysis (PCA) on the measured X-ray parameters shows that while the X-ray Eddington ratio is the main source of variations within our sample (PC1), variations in the soft and hard excesses form the second principal component (PC2) and it is dominated by the NLS1s. The correlation between the soft and hard excess in NLS1 galaxies may suggest a common origin for the two components, such as a blurred reflection model. The presented Suzaku sample of Seyfert 1 galaxies is a useful tool for analysis of the X-ray properties of AGN, and for the study of the soft and hard excesses observed in AGN.
