Suzaku Observation of the RCW86 Northeastern Shell
Suzaku Observation of the RCW86 Northeastern Shell
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DOI：
10.1093/pasj/60.sp1.s123
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发表时间：
2007-09
影响因子：
2.3
通讯作者：
H. Yamaguchi;K. Koyama;H. Nakajima;A. Bamba;R. Yamazaki;J. Vink;A. Kawachi
中科院分区：
文献类型：
--
作者：
H. Yamaguchi;K. Koyama;H. Nakajima;A. Bamba;R. Yamazaki;J. Vink;A. Kawachi
本文报道了RCW 86东北壳层的Suzaku研究结果。通过空间和光谱分析，我们将X射线分成三个不同的分量：低温（kTe-0.3 keV）和高温（kTe-1.8 keV）等离子体和非热分量，并发现它们的空间分布彼此不同。低温等离子体在东边缘占主导地位，而非热发射在东北边缘最亮，这是从东部空间连接。高温等离子体，被发现包含-6.42 keV线（低电离铁的K线），在相对于东边缘的向内区域增强，并且与非热X射线（东北部）没有空间相关性。这一结果表明，Fe-K线起源于富铁喷出物加热反向冲击。解释这些形态和光谱的一种可能的情况是，一个快速移动的冲击波在一个薄腔碰撞稠密的星际介质在东部地区最近。结果，在这个内部的反向冲击波减速，并到达喷射物的富铁区域，并将其加热。另一方面，在东北边缘，冲击波仍然快速移动，并加速电子，使它们发射出强烈的同步加速器X射线。
This paper reports on Suzaku results concerning the northeast shell of RCW 86. With both spatial and spectral analyses, we separated the X-rays into three distinct components: low (kTe � 0.3 keV) and high (kTe � 1.8 keV) temperature plasmas and a non-thermal component, and discovered that their spatial distributions are different from each other. The low-temperature plasma is dominated at the east rim, whereas the non-thermal emission is brightest at the northeast rim, which is spatially connected from the east. The high-temperature plasma, found to contain the � 6.42 keV line (K˛ 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-rays (the northeast). This result suggests that the Fe-K˛ line originates from Fe-rich ejecta heated by reverse shock. A possible scenario to explain these morphologies and spectra is that a fast-moving blast wave in a thin cavity collided with a dense interstellar medium at the east region very recently. As a 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 is accelerating electrons causing them to emit strong synchrotron X-rays.