关于CV、中子星和黑洞源中红斜铁线的非相对论起源
On the Non-relativistic Origin of Red-skewed Iron Lines in CV, Neutron Star and Black Hole Sources
摘要：
本文对激变变星GK Per、中子星X-1和黑洞GX 339-4这三种吸积致密源的铁K_α谱线进行了分析。利用XMM-牛顿天文台Epic-PN相机的观测资料，我们发现GK Per的铁K_α发射线有明显的红偏廓线。我们将GK Per不对称线与XMM-牛顿在Serpens X-1和GX 339-4中观察到的红色偏斜线进行了比较。在CV GK Per中观测到的K_α发射的红偏特征与广义相对论（GR）的红移效应无关。因此，如果CV、NS和BH中K_α线的形成机制相同，那么GR效应作为K_α线红偏的原因是可以排除的。最近有人提出，在外流风中的谱线再加工是宽红移铁谱线形成的另一种模型。在外流情景的框架中，由于吸积物质最内部发出的辐射照射，在强延伸风中形成了红斜铁线。在本文中，我们证明了从这些CV，NS和BH源检测到的线的不对称形状与风（流出）模型很好地描述。虽然这一事实很难与相对论模型相一致，但它与流出的气体冲洗掉辐射的高频调制是一致的，这些高频调制可能起源于源的最内部。
英文摘要：
We perform the analysis of the iron K_alpha lines detected in three sources representing of three types of accreting compact sources: cataclysmic variable (CV) GK Per, neutron star (NS) Serpens X-1 and black hole (BH) GX 339-4. We find, using data from Epic-PN Camera on-board XMM-Newton observatory,that the iron K_alpha emission line in GK Per has a noticeable red-skewed profile. We compare the GK Per asymmetric line with the red-skewed lines observed by XMM-Newton in Serpens X-1 and GX 339-4. The observation of the K_alpha emission with red-skewed features in CV GK Per cannot be related to the redshift effects of General Relativity (GR). Therefore, if the mechanism of the K_alpha-line formation is the same in CVs, NSs and BHs then it is evident that the GR effects would be ruled out as a cause of red skewness of K_alpha line. The line reprocessing in an outflowing wind has been recently suggested an alternative model for a broad red-shifted iron line formation. In the framework of the outflow scenario the red-skewed iron line is formed in the strong extended wind due to its illumination by the radiation emanating from the innermost part of the accreting material. In this Paper we demonstrate that the asymmetric shapes of the lines detected from these CV, NS and BH sources are well described with the wind (outflow) model. While this fact is hard to reconcile with the relativistic models, it is consistent with the outflowing gas washing out high frequency modulations of the radiation presumably originated in the innermost part of the source.
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