Discovery of recombining plasma inside the extended gamma-ray supernova remnant HB9
Discovery of recombining plasma inside the extended gamma-ray supernova remnant HB9
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DOI：
10.1093/mnras/stz2461
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发表时间：
2019-07
影响因子：
4.8
通讯作者：
A. Sezer;T. Ergin;R. Yamazaki;H. Sano;Y. Fukui
中科院分区：
文献类型：
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作者：
A. Sezer;T. Ergin;R. Yamazaki;H. Sano;Y. Fukui
介绍了朱雀X射线成像光谱仪对混合形态超新星遗迹HB 9（G160.9+2.6）的观测结果。我们在西朱雀观测区发现了复合等离子体，其光谱可以用一个含有碰撞电离平衡（CIE）和复合等离子体成分的模型很好地描述。另一方面，来自朱雀观测区东部的X射线光谱是最好的再现CIE和非平衡电离模型。我们讨论了可能的方案来解释的RP排放的观测性质的基础上的起源，并得出结论，稀疏的情况下是一个可能的解释RP的存在。此外，使用费米大天区望远镜（LAT）10年的数据，在0.2-300 GeV的能量范围内的伽马射线发射的形态和光谱进行了研究。HB 9的γ射线形态最好用射电连续辐射的空间模板来描述。该光谱符合对数抛物线函数，其检测显著性为25σ。此外，一个新的伽马射线点源位于外面的SNR的壳东南区域被检测到的意义为6σ。我们还研究了档案H i和CO数据，并在速度范围为$-10.5$和$+1.8$ km s-1的范围内检测到一个膨胀的壳层结构，这与HB 9壳层南部边缘的伽马射线增强区域相吻合。
We present the results from the Suzaku X-ray Imaging Spectrometer observation of the mixed-morphology supernova remnant (SNR) HB9 (G160.9+2.6). We discovered recombining plasma (RP) in the western Suzaku observation region and the spectra here are well described by a model having collisional ionization equilibrium (CIE) and RP components. On the other hand, the X-ray spectra from the eastern Suzaku observation region are best reproduced by the CIE and non-equilibrium ionization model. We discuss possible scenarios to explain the origin of the RP emission based on the observational properties and concluded that the rarefaction scenario is a possible explanation for the existence of RP. In addition, the gamma-ray emission morphology and spectrum within the energy range of 0.2–300 GeV are investigated using 10 yr of data from the Fermi Large Area Telescope (LAT). The gamma-ray morphology of HB9 is best described by the spatial template of radio continuum emission. The spectrum is well fit to a log-parabola function and its detection significance was found to be 25σ. Moreover, a new gamma-ray point source located just outside the south-east region of the SNR’s shell was detected with a significance of 6σ. We also investigated the archival H i and CO data and detected an expanding shell structure in the velocity range of $-10.5$ and $+1.8$ km s−1 that is coinciding with a region of gamma-ray enhancement at the southern rim of the HB9 shell.