X-Ray Spectroscopy of SN 1006 with Suzaku
X-Ray Spectroscopy of SN 1006 with Suzaku
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DOI：
10.1093/pasj/60.sp1.s141
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发表时间：
2007-06
影响因子：
2.3
通讯作者：
H. Yamaguchi;K. Koyama;S. Katsuda;H. Nakajima;J. Hughes;A. Bamba;J. Hiraga;K. Mori;M. Ozaki;T. Tsuru
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文献类型：
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作者：
H. Yamaguchi;K. Koyama;S. Katsuda;H. Nakajima;J. Hughes;A. Bamba;J. Hiraga;K. Mori;M. Ozaki;T. Tsuru
本文报道了用Suzaku对sn1006的观测结果。我们首次坚定地探测到Fe的k壳发射，并发现Fe的电离态相当低。从残骸东南部提取的宽频带光谱与由三个光学薄热非平衡电离等离子体和幂律分量组成的模型拟合良好。其中两种热模式的重元素含量过高，因此很可能是由于喷发所致。这些组分具有不同的电离参数，net ~ 1.4×10 10 cm s和net ~ 7.7×10 8 cm s；后者会产生Fe-K辐射。这表明，铁比其他元素更晚被反向激波加热，这与喷出物由内部铁组成分层的图像一致。另一方面，第三个热成分被认为是太阳丰度，我们将其与星际介质（ISM）的发射联系起来。电子温度（kTe ~ 0.5 keV）低于激波速度的预期，这表明在正向激波中缺乏无碰撞电子加热。极低的电离参数和极低的非平衡状态是由于周围介质的低密度造成的。
We report on observations of SN 1006 with Suzaku. We firmly detected K-shell emission from Fe, for the first time, and found that the Fe ionization state is quite low. The broad-band spectrum extracted from southeast of the remnant was well-fitted with a model consisting of three optically thin thermal non-equilibrium ionization plasmas and a power-law component. Two of the thermal models are highly overabundant in heavy elements, and hence are likely due to ejecta. These components have different ionization parameters, net∼ 1.4×10 10 cm s and net∼ 7.7×10 8 cm s; it is the later one that produces Fe-K emission. This suggests that Fe has been heated by reverse shock more recently than the other elements, consistent with a picture where the ejecta are stratified by composition with Fe in the interior. On the other hand, the third thermal component is assumed to be solar abundance, and we associate it with emission from the interstellar medium (ISM). The electron temperature (kTe ∼ 0.5 keV) is lower than that expected from the shock velocity, which suggests a lack of collisionless electron heating at the forward shock. The extremely low ionization parameter and extreme non-equilibrium state are due to the low density of the ambient medium.