The anticorrelation between the hard X-ray photon index and the Eddington ratio in low-luminosity active galactic nuclei？
The anticorrelation between the hard X-ray photon index and the Eddington ratio in low-luminosity active galactic nuclei？
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DOI：
10.1111/j.1365-2966.2009.15277.x
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发表时间：
2009-06
影响因子：
4.8
通讯作者：
M. Gu;Xinwu Cao
中科院分区：
文献类型：
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作者：
M. Gu;Xinwu Cao
我们发现低电离核发射线区域和当地赛弗特星系样本的硬 X 射线光子指数与爱丁顿比 Lbol/LEdd 之间存在显着的反相关性，这些样本是根据钱德拉或 XMM-牛顿观测文献汇编的。这一结果与发光活动星系核（AGN）中发现的正相关形成鲜明对比，而与低/硬状态下的X射线双星（XRB）的结果相似。我们的结果在质量上与平流主导吸积流 (ADAF) 产生的光谱一致。这意味着低光度活动星系核（LLAGN）的X射线发射可能源自ADAF中的康普顿化过程，并且LLAGN中的吸积过程可能类似于低/硬态XRB的吸积过程，这与发光态中的XRB不同。
We find a significant anticorrelation between the hard X-ray photon indexand the Eddington ratio Lbol/LEdd for a sample of low-ionization nuclear emission-line regions and local Seyfert galaxies, compiled from literature with Chandra or XMM-Newton observations. This result is in contrast with the positive correlation found in luminous active galactic nuclei (AGN), while it is similar to that of X-ray binaries (XRBs) in the low/hard state. Our result is qualitatively consistent with the spectra produced from advection-dominated accretion flows (ADAFs). It implies that the X-ray emission of low-luminosity active galactic nuclei (LLAGN) may originate from the Comptonization process in ADAF, and the accretion process in LLAGN may be similar to that of XRBs in the low/hard state, which is different from that in luminous