The X-Ray Synchrotron Emission of RCW 86 and the Implications for Its Age
The X-Ray Synchrotron Emission of RCW 86 and the Implications for Its Age
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DOI：
10.1086/507628
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发表时间：
2006-07
期刊：
影响因子：
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通讯作者：
J. Vink;J. Bleeker;K. van der Heyden;A. Bykov;A. Bamba;R. Yamazaki
中科院分区：
文献类型：
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作者：
J. Vink;J. Bleeker;K. van der Heyden;A. Bykov;A. Bamba;R. Yamazaki
我们报告的X射线成像光谱观测的东北壳的超新星遗迹RCW 86使用钱德拉和XMM-牛顿。沿着这部分的壳，占主导地位的X射线辐射机制的变化，从热同步辐射。我们认为X射线同步辐射的存在和同步辐射发射区的宽度都表明局部较高的激波速度为Vs <$2700 km s-1，磁场为B <$24 ± 5 μG。此外，我们还表明，一个简单的幂律宇宙射线电子谱的指数截止不能解释宽带同步辐射。相反，需要一个凹的电子光谱，如非线性冲击加速模型所预测的。最后，我们表明，导出的激波速度加强的情况下，RCW 86是SN 185的残留物。
We report X-ray imaging spectroscopy observations of the northeastern shell of the supernova remnant RCW 86 using Chandra and XMM-Newton. Along this part of the shell, the dominant X-ray radiation mechanism changes from thermal to synchrotron emission. We argue that both the presence of X-ray synchrotron radiation and the width of the synchrotron-emitting region suggest a locally higher shock velocity of Vs ≈ 2700 km s-1 and a magnetic field of B ≈ 24 ± 5 μG. Moreover, we also show that a simple power-law cosmic-ray electron spectrum with an exponential cutoff cannot explain the broadband synchrotron emission. Instead, a concave electron spectrum is needed, as predicted by nonlinear shock acceleration models. Finally, we show that the derived shock velocity strengthens the case that RCW 86 is the remnant of SN 185.