预测与超新星遗迹pevatron相关的云的伽马射线

A. Mitchell, G. Rowell, S. Celli, S. Einecke
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引用次数: 1

摘要

星际云可以作为强子宇宙射线的靶物质;通过非弹性质子-质子碰撞产生的伽马射线,在空间上与云相关,提供了有效粒子加速的关键指标。然而,即使对于达到PeV能量的PeVatron源,云和加速器系统也必须满足几个条件,才能产生可探测的伽马射线通量。在这篇文章中,我们描述了云和加速器的必要特性。利用现有的超新星遗迹(SNR)和星际云目录,并假设粒子加速到PeV能量在附近的信噪比,我们产生了一个最有希望的目标系统的候选名单;那些被预测有可探测的伽马射线通量的。我们讨论了未来设施的探测前景,包括CTA和SWGO;并将我们的预测与已知的伽马射线源进行比较,包括LHAASO最近探测到的超高能量源。我们测试了一系列模型情景,包括扩散系数和粒子光谱的变化,在这些情况下,我们候选名单中的最佳候选云始终是明亮的。平均而言,更大质量的云更有可能探测到伽马射线通量;对于信噪比与云分离距离较低的系统;对于更老的信噪比,由于粒子穿越分离距离所需的时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Predictions for gamma-rays from clouds associated with supernova remnant PeVatrons
Interstellar clouds can act as target material for hadronic cosmic rays; gamma-rays produced through inelastic proton-proton collisions and spatially associated with the clouds provide a key indicator of efficient particle acceleration. However, even for PeVatron sources reaching PeV energies, the system of cloud and accelerator must fulfil several conditions in order to produce a detectable gamma-ray flux. In this contribution, we characterise the necessary properties of both cloud and accelerator. Using available Supernova Remnant (SNR) and interstellar cloud catalogues, and assuming particle acceleration to PeV energies in a nearby SNR, we produce a ranked shortlist of the most promising target systems; those for which a detectable gamma-ray flux is predicted. We discuss detection prospects for future facilities including CTA and SWGO; and compare our predictions with known gamma-ray sources, including the Ultra-High-Energy sources recently detected by LHAASO. A range of model scenarios are tested, including variation in the diffusion coefficient and particle spectrum, under which the best candidate clouds in our shortlist are consistently bright. On average, a detectable gamma-ray flux is more likely for more massive clouds; for systems with lower separation distance between the SNR and cloud; and for slightly older SNRs, due to the time required for particles to traverse the separation distance.
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