arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.0066astro-ph.HE
收藏

用MAGIC探测W51C中的质子加速

Probing proton acceleration in W51C with MAGIC

Julian Krause, Emiliano Carmona, Ignasi Reichardt

摘要:

W51 C位于密集的复杂环境中,为探测SNR中的加速质子及其与周围目标材料的相互作用提供了极好的方案。本文报道了利用MAGIC对W51 C超新星遗迹(SNR)的扩展甚高能(VHE)γ射线辐射的观测结果。费米和H.E.S.S.已经报道了在同一区域探测到扩展的伽马射线发射。合作。费米/LAT测量的源谱在0.2和50 GeV之间的能量范围内,这被认为是很好地符合强子中性介子衰变模型。这里介绍的VHE观测,获得了改进的MAGIC立体系统,使我们能够精确定位VHE伽马射线发射的密集冲击分子云周围的残余壳。MAGIC数据还使我们能够首次测量W51 C从最高费米/LAT能量到TeV的VHE发射光谱。VHE发射的空间分布和光谱特性表明所观察到的伽马射线的强子起源。因此,W51 C是宇宙射线加速器的主要候选者。

英文摘要:

Located in a dense complex environment, W51C provides an excellent scenario to probe accelerated protons in SNRs and their interaction with surrounding target material. Here we report the observation of extended Very High Energy (VHE) gamma-ray emission from the W51C supernova remnant (SNR) with MAGIC. Detections of extended gamma-ray emission in the same region have already been reported by the Fermi and H.E.S.S. collaborations. Fermi/LAT measured the source spectrum in the energy range between 0.2 and 50 GeV, which was found to be well fit by a hadronic neutral-pion decay model. The VHE observations presented here, obtained with the improved MAGIC stereo system, allow us to pinpoint the VHE gamma-ray emission in the dense shocked molecular cloud surrounding the remnant shell. The MAGIC data also allow us to measure, for the first time, the VHE emission spectrum of W51C from the highest Fermi/LAT energies up to TeV. The spatial distribution and spectral properties of the VHE emission suggest a hadronic origin of the observed gamma rays. Therefore W51C is a prime candidate for a cosmic ray accelerator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑