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arXiv 1607.04035astro-ph.HE
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银河系中心扩散粒子传播和相关TeV gamma-ray发射的模拟

Simulation of diffusive particle propagation and related TeV gamma-ray emission at the Galactic Center

Alexander Ziegler, Christopher van Eldik

摘要:

用高能立体观测系统(H.E.S.S.)对银河系中心(GC)区域进行甚高能(VHE,>100 GeV)伽马射线观测,导致在2006年探测到扩散伽马射线辐射的扩展区域。到目前为止,这种发射的确切来源仍然不清楚,虽然中央分子区(CMZ)的分子材料的密度分布和观测到的伽马射线过剩点的形态之间的紧密空间相关性朝向强子产生场景。在这篇文章中,我们提出了一个数值研究的高能宇宙射线(CR)的传播通过一个动荡的环境,如GC区域。在我们的分析中,我们推导出一个依赖于能量的扩散系数的参数化,我们使用我们的模拟在GC的扩散伽马射线发射。假设强子CRs已被释放的一个单一的脉冲事件在我们的银河系的中心,我们探讨的问题是否扩散强子与周围物质的相互作用过程可以解释所观察到的扩散伽玛射线过剩。我们的结果不赞成这种情况下,我们的分析表明,扩散过程是,在时间尺度上相比,在GC区域的典型质子寿命,太慢,无法解释所观察到的发射的扩展。

英文摘要:

Observations of the Galactic Center (GC) region in very-high-energy (VHE, >100 GeV) gamma rays, conducted with the High Energy Stereoscopic System (H.E.S.S.), led to the detection of an extended region of diffuse gamma-ray emission in 2006. To date, the exact origin of this emission has remained unclear, although a tight spatial correlation between the density distribution of the molecular material of the Central Molecular Zone (CMZ) and the morphology of the observed gamma-ray excess points towards a hadronic production scenario. In this proceeding, we present a numerical study of the propagation of high-energy cosmic rays (CRs) through a turbulent environment such as the GC region. In our analysis, we derive an energy-dependent parametrization for the diffusion coefficient which we use for our simulation of the diffuse gamma-ray emission at the GC. Assuming that hadronic CRs have been released by a single impulsive event at the center of our Galaxy, we probe the question whether or not the interaction processes of the diffusing hadrons with ambient matter can explain the observed diffuse gamma-ray excess. Our results disfavor this scenario, as our analysis indicates that the diffusion process is, on timescales compared to the typical proton lifetime at the GC region, too slow to explain the extension of the observed emission.

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。

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