On the role of the Γ - λEdd relation on the X-ray Baldwin effect in active galactic nuclei
On the role of the Γ - λEdd relation on the X-ray Baldwin effect in active galactic nuclei
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DOI：
10.1093/mnras/stt1326
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发表时间：
2013-07
影响因子：
4.8
通讯作者：
C. Ricci;S. Paltani;Y. Ueda;H. Awaki
中科院分区：
文献类型：
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作者：
C. Ricci;S. Paltani;Y. Ueda;H. Awaki
X射线鲍德温效应是铁卡尔法线窄分量的等效宽度(EW)与活动星系核(AGN)X射线光度(AGN)之间的负相关。在Fe Kalpha EW和Eddington比率(Lambda_Edd)之间也观察到类似的趋势。利用Shu等人的Chandra/HEG结果。(2010)和测辐射热校正值之间的关系，得到了对数EW=(-0.13+/-0.03)log(Lambda_Edd)+1.47。我们探讨了初级X射线连续体的光子指数(Gamma)和lambda_Edd之间的已知正相关对X射线Baldwin效应的作用。考虑了环形、球环和板条三种不同几何形状的反射材料，模拟了未被吸收的活动星系核粒子的铁卡尔法谱线。我们发现，Gamma-lambda_Edd关联不能解释整个X射线Baldwin效应，除非Gamma对lambda_Edd有很强的依赖性，就像Risaliti等人最近发现的那样。(2009)和金等人。(2012)，被假定为。EW和伽马之间没有明显的相关性。我们的结论是，很好地理解Gamma-Lambda_Edd关系的斜率对于评估这一趋势在X射线Baldwin效应中起主导作用还是边缘作用是至关重要的。
The X-ray Baldwin effect is the inverse correlation between the equivalent width (EW) of the narrow component of the iron Kalpha line and the X-ray luminosity of active galactic nuclei (AGN). A similar trend has also been observed between Fe Kalpha EW and the Eddington ratio (lambda_Edd). Using Chandra/HEG results of Shu et al. (2010) and bolometric corrections we study the relation between EW and the lambda_Edd, and find that log EW = (-0.13+/-0.03)log(lambda_Edd) + 1.47. We explore the role of the known positive correlation between the photon index of the primary X-ray continuum (Gamma) and lambda_Edd on the X-ray Baldwin effect. We simulate the iron Kalpha line emitted by populations of unabsorbed AGN considering 3 different geometries of the reflecting material: toroidal, spherical-toroidal and slab. We find that the Gamma-lambda_Edd correlation cannot account for the whole X-ray Baldwin effect, unless a strong dependence of Gamma on lambda_Edd, such as the one recently found by Risaliti et al. (2009) and Jin et al. (2012), is assumed. No clear correlation is found between EW and Gamma. We conclude that a good understanding of the slope of the Gamma-lambda_Edd relation is critical to assess whether the trend plays a leading or rather a marginal role in the X-ray Baldwin effect.