RCW86东北壳的朱雀观测
Suzaku Observation of the RCW86 Northeastern Shell
摘要：
本文报道了RCW 86东北壳的Suzaku结果。通过空间和光谱分析，我们将X射线分离为三个不同的分量：低温（kT_e~0.3keV）和高温（kT_e~1.8keV）等离子体以及一个非热分量，发现它们的空间分布是不同的。在东边缘，低温等离子体占主导地位，而非热辐射在与东边缘空间相连的东北边缘最亮。高温等离子体中含有~6.42keV（低电离铁的K α）谱线，在东边缘的内部区域增强，与非热X射线（东北方向）没有空间相关性。因此，Fe-K α线与非热辐射无关，而是由反向激波加热到高温的富铁喷出物产生的。由于低温等离子体的金属丰度低于太阳，因此该成分最有可能的来源是被冲击波加热的星际介质。非热X射线的幂律指数约为2.8，很可能是同步辐射。解释这些形态和光谱的一种可能的情况是：在OB星协的一个薄腔中，一个快速移动的冲击波最近在东部区域与一个致密的星际介质或云碰撞。结果，在这一内部的反向冲击波减速，到达喷发物的富铁区域并加热。另一方面，在东北边缘，冲击波仍然快速移动，并加速高能电子发射同步加速X射线。
英文摘要：
This paper reports the Suzaku results on the northeast shell of RCW 86. With the spatial and spectral analysis, we separated the X-rays into three distinct components; low (kT_e~0.3keV) and high (kT_e~1.8keV) temperature plasmas and a non-thermal component, and discovered their spatial distributions are different from each other. The low temperature plasma is dominated at the east rim, whereas the non-thermal emission is the brightest at the northeast rim which is spatially connected from the east rim. The high temperature plasma, found to contain the ~6.42keV line (K alpha of low-ionized iron), is enhanced at the inward region with respect to the east rim and has no spatial correlation with the non-thermal X-ray (the northeast). The Fe-Kalpha line, therefore, is not related to the non-thermal emission but originates from Fe-rich ejecta heated to the high temperatures by the reverse shock. Since the metal abundances of the low temperature plasma are sub-solar, the most possible origin of this component is interstellar medium heated by a blast wave. The non-thermal X-ray, which has a power-law index of ~2.8, is likely to be synchrotron emission. A possible scenario to explain these morphologies and spectra is: A fast moving blast wave in a thin cavity of OB association collided with a dense interstellar medium or cloud at the east region very recently. As the result, the reverse shock in this interior decelerated, and arrived at the Fe-rich region of the ejecta and heated it. In the northeast rim, on the other hand, the blast wave is still moving fast, and accelerated high energy electrons to emit synchrotron X-rays.
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