Hadronic Scenarios for Gamma-Ray Emission from Three Supernova Remnants Interacting with Molecular Clouds
Hadronic Scenarios for Gamma-Ray Emission from Three Supernova Remnants Interacting with Molecular Clouds
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DOI：
10.1088/0256-307x/31/4/049801
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发表时间：
2014-03
影响因子：
3.5
通讯作者：
Huan 欢 Yu 于;J. Fang 方;L. Zhang 张
中科院分区：
文献类型：
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作者：
Huan 欢 Yu 于;J. Fang 方;L. Zhang 张
最近报道了费米γ射线空间望远镜在HB 21、MSH 17-39和G337.0-0.1方向上探测到GeV γ射线。这三个超新星遗迹（SNRs）显示出与分子云的相互作用，它们是有效的伽马射线发射体，因为被SNR冲击加速的相对论质子与云中的致密气体发生非弹性碰撞。在扩散激波加速的情况下，研究了这三个遗迹的观测γ射线的起源。在该模型中，一部分信噪比激波传播到附近的分子云中，激波速度大大降低。结果产生了一个相对较低的Alfvén马赫数的激波，并可以获得加速质子和质子-质子相互作用产生的γ射线光子的光谱。结果表明，三种SNRs与分子云相互作用的γ射线谱都可以再现。结果表明，这三种信噪比的γ射线都是强子起源的，并且信噪比冲击加速质子的能力也得到了支持。
GeV γ-rays detected with the large area telescope on board the Fermi Gamma-ray space telescope in the direction of HB21, MSH 17-39 and G337.0-0.1 have been recently reported. The three supernova remnants (SNRs) show interactions with molecular clouds, and they are effective gamma-ray emitters as the relativistic protons accelerated by the SNR shocks inelastically colliding with the dense gas in the clouds. The origin of the observed γ-rays for the three remnants is investigated in the scenario of the diffusive shock acceleration. In the model, a part of the SNR shock transmits into the nearby molecular clouds, and the shock velocity is greatly reduced. As a result, a shock with a relatively low Alfvén Mach number is generated, and the spectra of the accelerated protons and the γ-ray photons produced via proton-proton interaction can be obtained. The results show that the observed γ-ray spectra for the three SNRs interacting with the molecular clouds can be reproduced. It can be concluded that the hadronic origin of the γ-rays for the three SNRs is approved, and the ability of SNR shocks to accelerate protons is also supported.