论文标题
从太阳耀斑和检测原恒星的非热标志的前景中建模的辐射伽马射线排放
Modeling Hadronic Gamma-ray Emissions from Solar Flares and Prospects for Detecting Non-thermal Signatures from Protostars
论文作者
论文摘要
我们研究了太阳耀斑冲动阶段的γ射线发射以及来自原恒星耀斑的非热特征的可检测性。能量太阳能发射GEV能量的高能量伽玛射线，但它们的生产机制和发射部位仍然未知。年轻的恒星物体（包括原恒星）也表现出发光的X射线耀斑，但由于强烈的遮盖力，燃烧活性的触发机理仍不清楚。 MM/sub-mm和伽马射线带中的非热特征可用于探测其强大的渗透能力，因此有用。我们开发了太阳耀斑冲动阶段的非热发射模型，在终止休克下加速的宇宙射线质子通过与蒸发等离子体的强核相互作用产生高能伽马射线。该模型可以在太阳耀斑的冲动阶段重现伽马射线数据。我们将模型应用于原始的耀斑，并表明，如果Protostellar Flares中的颗粒加速度有效，Cherenkov望远镜阵列将能够检测到TeV Energies的伽马射线。与质子一起加速的非热电子可以通过同步加速器辐射发射强MM和亚MM信号，其功率与来自年轻恒星观察到的能量MM/Sub-MM瞬变一致。从原始X射线观察协调的原恒星的未来伽马射线和MM/sub-MM观察结果将揭示非热颗粒的产生和触发原始耀斑的机制。
We investigate gamma-ray emission in the impulsive phase of solar flares and the detectability of non-thermal signatures from protostellar flares. Energetic solar flares emit high-energy gamma rays of GeV energies, but their production mechanism and emission site are still unknown. Young stellar objects, including protostars, also exhibit luminous X-ray flares, but the triggering mechanism of the flaring activity is still unclear due to the strong obscuration. Non-thermal signatures in mm/sub-mm and gamma-ray bands are useful to probe protostellar flares owing to their strong penetration power. We develop a non-thermal emission model of the impulsive phase of solar flares, where cosmic-ray protons accelerated at the termination shock produce high-energy gamma rays via hadronuclear interaction with the evaporation plasma. This model can reproduce gamma-ray data in the impulsive phase of a solar flare. We apply our model to protostellar flares and show that Cherenkov Telescope Array will be able to detect gamma rays of TeV energies if particle acceleration in protostellar flares is efficient. Non-thermal electrons accelerated together with protons can emit strong mm and sub-mm signals via synchrotron radiation, whose power is consistent with the energetic mm/sub-mm transients observed from young stars. Future gamma-ray and mm/sub-mm observations from protostars, coordinated with a hard X-ray observation, will unravel the non-thermal particle production and triggering mechanism of protostellar flares.
