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arXiv 2201.11387astro-ph.HE
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从强子背景下的两个超新星遗迹模拟HESS J1804-216的Gamma-Ray形态

Modelling the Gamma-Ray Morphology of HESS J1804-216 from Two Supernova Remnants in a Hadronic Scenario

K. Feijen, S. Einecke, G. Rowell, C. Braiding, M. G. Burton, G. F. Wong

摘要:

HESS J1804-216是迄今为止发现的最明亮但最神秘的TeV伽马射线源之一。先前对这个TeV伽马射线源周围的星际介质(ISM)进行的弧分尺度研究表明,HESS J1804-216可能是由成熟的超新星遗迹(SNR)或脉冲星提供动力的,因此它的起源仍然不确定。在本文中,我们专注于扩散逃逸宇宙射线质子从潜在的SNR加速器。这些宇宙射线与ISM相互作用产生TeV伽马射线。我们利用从壳层逸出的粒子的各向同性扩散方程解来模拟质子进入ISM的能量依赖性逸出和传播。这项工作是第一次尝试模拟HESS J1804-216的伽马射线的空间形态,使用了Mopra和南银河平面巡天的弧分ISM观测。给出了附近两个潜在SNR对应物SNR G8.7-0.1和PSR J1803-2137的原始SNR的伽马射线光谱和空间分布。我们改变扩散参数和粒子谱,并使用网格搜索方法来找到模型参数的最佳组合。我们的结论是,适度缓慢的扩散是必要的两个候选人。最有希望的候选人是供电的TeV伽马射线从HESS J1804-216在强子的情况下是祖SNR的PSR J1803-213。

英文摘要:

HESS J1804-216 is one of the brightest yet most mysterious TeV gamma-ray sources discovered to date. Previous arc-minute scale studies of the interstellar medium (ISM) surrounding this TeV gamma-ray source revealed HESS J1804-216 is likely powered by a mature supernova remnant (SNR) or pulsar, hence its origin remains uncertain. In this paper, we focus on the diffusive escape of cosmic-ray protons from potential SNR accelerators. These cosmic rays interact with the ISM to produce TeV gamma-rays. We utilise the isotropic diffusion equation solution for particles escaping from a shell, to model the energy-dependent escape and propagation of protons into the ISM. This work is the first attempt at modelling the spatial morphology of gamma-rays towards HESS J1804-216, using arc-minute ISM observations from both Mopra and the Southern Galactic Plane Survey. The spectral and spatial distributions of gamma-rays for the two nearby potential SNR counterparts, SNR G8.7-0.1 and the progenitor SNR of PSR J1803-2137, are presented here. We vary the diffusion parameters and particle spectrum and use a grid search approach to find the best combination of model parameters. We conclude that moderately slow diffusion is required for both candidates. The most promising candidate to be powering the TeV gamma-rays from HESS J1804-216 in a hadronic scenario is the progenitor SNR of PSR J1803-213.

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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