Modelling the gamma-ray morphology of HESSJ1804-216 from two supernova remnants in a hadronic scenario
Modelling the gamma-ray morphology of HESSJ1804-216 from two supernova remnants in a hadronic scenario
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在强子场景中对两个超新星遗迹的 HESSJ1804-216 的伽马射线形态进行建模
DOI：
10.1093/mnras/stac320
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发表时间：
2022
影响因子：
4.8
通讯作者：
Feijen K
中科院分区：
文献类型：
--
作者：
Feijen K
赫斯 J1804−216是迄今为止发现的最亮也是最神秘的TeVγ射线源之一。之前对这个TeVγ射线源周围星际介质的弧度-分钟尺度研究表明， Hess J1804−216很可能是由成熟的超新星残骸或脉冲星提供动力的，因此它的起源尚不清楚。本文主要研究宇宙线质子从潜在的SNR加速器中的扩散逸出。这些宇宙射线与ISM相互作用，产生TeVγ射线。我们利用粒子从壳层逃逸的各向同性扩散方程的解，来模拟质子在ISM中的能量逃逸和传播。这项工作是第一次尝试利用MOPRA和南银河系平面勘测的弧分ISM观测来模拟γ射线朝向 Hess J1804−216的空间形态。给出了附近两个潜在信噪比对应的γ射线的光谱和空间分布，它们分别是 G8.7−0.1和PSR J1803−2137的前身信噪比。我们改变扩散参数和粒子谱，并使用网格搜索方法来寻找模型参数的最佳组合。我们的结论是，两位候选人都需要适度缓慢的扩散。在强子场景中，最有希望为来自Hess γJ1804 PSR 216的TeV 射线供电的候选者是− J1803−2137的前身信噪比。
HESS J1804−216 is one of the brightest yet most mysterious TeV γ-ray sources discovered to date. Previous arc-minute scale studies of the interstellar medium (ISM) surrounding this TeV γ-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 γ-rays. We utilize 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 γ-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 γ-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 γ-rays from HESS J1804−216 in a hadronic scenario is the progenitor SNR of PSR J1803−2137.