SHOCK–CLOUD INTERACTION AND PARTICLE ACCELERATION IN THE SOUTHWESTERN LIMB OF SN 1006
SHOCK–CLOUD INTERACTION AND PARTICLE ACCELERATION IN THE SOUTHWESTERN LIMB OF SN 1006
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DOI：
10.1088/2041-8205/782/2/l33
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
M. Miceli;F. Acero;G. Dubner;A. Decourchelle;S. Orlando;F. Bocchino
中科院分区：
文献类型：
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作者：
M. Miceli;F. Acero;G. Dubner;A. Decourchelle;S. Orlando;F. Bocchino
超新星遗迹SN 1006是一个强大的高能粒子源，尽管在其西北边缘与原子云相互作用，但仍在相对稀薄和均匀的环境中演化。SN 1006的X射线图像显示了在冲击波阵面西南部的一个凹陷，H i图显示了一个孤立的（西南）云，具有与西北云相同的速度，其形态完全符合凹陷。我们进行了空间分辨光谱分析的一组小区域在西南非热翼，并研究了XMM-牛顿SN 1006大型计划内获得的深X射线光谱。我们还分析了档案H i数据，通过结合单碟和干涉观测。我们发现，来自X射线光谱的NH的最佳拟合值显着增加对应的西南云的区域，而同步辐射的截止能量降低。NH的变化与西南云的H i柱密度完全对应，从无线电数据测量。在缺口处截止能量的减少清楚地表明，云的背面实际上是与残余物相互作用的。因此，西南翼呈现出有效粒子加速和高环境密度的独特组合，因此是SN 1006中最有希望的γ射线强子发射区域。我们估计，这种辐射将在几年内被费米望远镜探测到。
The supernova remnant SN 1006 is a powerful source of high-energy particles and evolves in a relatively tenuous and uniform environment despite interacting with an atomic cloud in its northwestern limb. The X-ray image of SN 1006 reveals an indentation in the southwestern part of the shock front and the H i maps show an isolated (southwestern) cloud, having the same velocity as the northwestern cloud, whose morphology fits perfectly in the indentation. We performed spatially resolved spectral analysis of a set of small regions in the southwestern nonthermal limb and studied the deep X-ray spectra obtained within the XMM-Newton SN 1006 Large Program. We also analyzed archive H i data, obtained by combining single-dish and interferometric observations. We found that the best-fit value of NH derived from the X-ray spectra significantly increases in regions corresponding to the southwestern cloud, while the cutoff energy of the synchrotron emission decreases. The NH variation corresponds perfectly with the H i column density of the southwestern cloud, as measured from the radio data. The decrease in the cutoff energy at the indentation clearly reveals that the back side of the cloud is actually interacting with the remnant. The southwestern limb therefore presents a unique combination of efficient particle acceleration and high ambient density, thus being the most promising region for γ-ray hadronic emission in SN 1006. We estimate that such emission will be detectable with the Fermi telescope within a few years.