SNR Kes 73中AXP 1 E 1841-045的Suzaku观察
Suzaku Observation of AXP 1E 1841-045 in SNR Kes 73
摘要：
异常X射线双星（AXP）被认为是磁星，它是一种具有超强磁场的中子星，磁场强度为$10^{14}$ -- $10^{15}$ G.它们的能谱低于$\sim$ 10 keV的两个组件组成的黑体（BB）（$\sim$ 0.4 keV）和相当陡峭的幂律（POW）函数（光子指数$\sim$ 2-4）很好地模拟。Kuiper等人（2004）从一些AXP中发现了高于$\sim$ 10 keV的硬X射线成分。在这里，我们介绍了朱雀观测的AXP 1 E 1841-045在超新星遗迹Kes 73的中心。通过这一观测，我们可以同时分析0.4至50 keV的光谱。然后，我们可以测试在这个宽的能量范围内，上述光谱模型是否有效。发现用BB + POW模型进行光谱拟合时存在残差。通过添加另一个BB或POW组件来改善配合。但是在相位分辨光谱中，每个组分的含义变得模糊不清。另外，我们发现，NPEX模型适合相位平均光谱和相位分辨光谱。在这种情况下，光子指数在所有相位期间是恒定的，并且光谱变化似乎非常明显。这一事实对磁星的辐射具有某种基本意义。
英文摘要：
Anomalous X-ray pulsars (AXPs) are thought to be magnetars, which are neutron stars with ultra strong magnetic field of $10^{14}$-- $10^{15}$ G. Their energy spectra below $\sim$10 keV are modeled well by two components consisting of a blackbody (BB) ($\sim$0.4 keV) and rather steep power-law (POW) function (photon index $\sim$2-4). Kuiper et al.(2004) discovered hard X-ray component above $\sim$10 keV from some AXPs. Here, we present the Suzaku observation of the AXP 1E 1841-045 at the center of supernova remnant Kes 73. By this observation, we could analyze the spectrum from 0.4 to 50 keV at the same time. Then, we could test whether the spectral model above was valid or not in this wide energy range. We found that there were residual in the spectral fits when fit by the model of BB + POW. Fits were improved by adding another BB or POW component. But the meaning of each component became ambiguous in the phase-resolved spectroscopy. Alternatively we found that NPEX model fit well for both phase-averaged spectrum and phase-resolved spectra. In this case, the photon indices were constant during all phase, and spectral variation seemed to be very clear. This fact suggests somewhat fundamental meaning for the emission from magnetars.
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