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arXiv 1506.02307astro-ph.HE
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gamma-ray能区TeV壳层超新星遗迹的研究

Study of TeV shell supernova remnants at gamma-ray energies

F. Acero, M. Lemoine-Goumard, M. Renaud, J. Ballet, J. W. Hewitt, R. Rousseau, T. Tanaka

摘要:

切伦科夫望远镜在过去十年中取得了突破性的发展,角分辨率达到了0.1°,灵敏度达到了前所未有的水平。这使得目前的切伦科夫望远镜能够发现一群超新星遗迹(SNRs)辐射出极高能量(VHE,E>100 GeV)的伽马射线。这些VHE SNR的一些表现出壳型形态空间一致的冲击前的SNR。这个VHE外壳SNR俱乐部的成员是RX J1713.7-3946、Vela Jr、RCW 86、SN 1006和HESS J1731-347。后两个物体在高能(HE,0.1<E<100 GeV)伽马射线中的研究很少,需要进行研究,以绘制这类SNR的全局图像,并限制加速粒子的基本种群的特征。利用6年的费米P7再处理数据,我们研究了SNRs HESS J1731-347和SN 1006的HE对应物。在数据中未检测到这两个SNR,并且鉴于没有检测的迹象,我们预计在未来几年内不会从SNR中检测到任何检测。然而,在这两种情况下,我们推导出的上限显着约束的伽马射线发射机制,可以排除一个标准的强子的情况下,置信水平> 5西格玛。有了这个费米分析,我们现在有一个完整的视图,他VHE伽马射线发射的TeV壳信噪比。所有五个源都有一个硬HE光子指数(<1.8),这表明一个常见的情况是,大部分发射是由从无线电辐射到VHE伽马射线的加速电子通过同步加速器和逆康普顿过程产生的。此外,当校正距离时,所有SNR都显示出惊人的相似的伽马射线光度,支持共同发射机制的想法。虽然伽马射线的辐射可能是轻子主导的,但这并不排除在这些SNR中有效的强子加速。

英文摘要:

The breakthrough developments of Cherenkov telescopes in the last decade have led to angular resolution of 0.1° and an unprecedented sensitivity. This has allowed the current generation of Cherenkov telescopes to discover a population of supernova remnants (SNRs) radiating in very-high-energy (VHE, E>100 GeV) gamma-rays. A number of those VHE SNRs exhibit a shell-type morphology spatially coincident with the shock front of the SNR. The members of this VHE shell SNR club are RX J1713.7-3946, Vela Jr, RCW 86, SN 1006, and HESS J1731-347. The latter two objects have been poorly studied in high-energy (HE, 0.1<E<100 GeV) gamma-rays and need to be investigated in order to draw the global picture of this class of SNRs and constrain the characteristics of the underlying population of accelerated particles. Using 6 years of Fermi P7 reprocessed data, we studied the HE counterpart of the SNRs HESS J1731-347 and SN 1006. The two SNRs are not detected in the data and given that there is no hint of detection, we do not expect any detection in the coming years from the SNRs. However in both cases, we derived upper limits that significantly constrain the gamma-ray emission mechanism and can rule out a standard hadronic scenario with a confidence level > 5 sigma. With this Fermi analysis, we now have a complete view of the HE to VHE gamma-ray emission of TeV shell SNRs. All five sources have a hard HE photon index (<1.8) suggesting a common scenario where the bulk of the emission is produced by accelerated electrons radiating from radio to VHE gamma-rays through synchrotron and inverse Compton processes. In addition when correcting for the distance, all SNRs show a surprisingly similar gamma-ray luminosity supporting the idea of a common emission mechanism. While the gamma-ray emission is likely to be leptonic dominated, this does not rule out efficient hadron acceleration in those SNRs.

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