Explaining the extended GeV gamma-ray emission adjacent to HESS J1825-137
Explaining the extended GeV gamma-ray emission adjacent to HESS J1825-137
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解释邻近 HESS J1825-137 的扩展 GeV 伽马射线发射
DOI：
10.1093/mnras/stab983
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发表时间：
2021
影响因子：
4.8
通讯作者：
Einecke S
中科院分区：
文献类型：
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作者：
Collins T;Rowell G;Mitchell A M W;Voisin F;Fukui Y;Sano H;Alsulami R;Einecke S
HESS J1825-137是最强大和最明亮的TeV伽马射线脉冲星风星云（PWN）之一。在HESS J1825-137的南部，Fermi-LAT观测发现了一个新的GeV伽玛射线发射区域，有三个明显的峰（这里称为GeV- abc）。本研究提出了星际介质（ISM）数据和GeV发射的光谱能量分布（SED）模型，以了解潜在的粒子加速。我们考虑了几种粒子加速器场景——与HESS J1825-137相关的PWN，与HESS J1825-137相关的祖先信噪比，以及伽马射线双星系统LS 5039。发现HESS J1825-137的原星信噪比不足以解释所有GeV发射。假设快速扩散可能包括平流，GeV-ABC可能是与HESS 1825-137相关的PWN历史上较早时期的反映。LS 5039不能满足作为粒子加速源所需的能量。HESS J1825-137和LS 5039的组合可能是可信的来源。
HESS J1825-137 is one of the most powerful and luminous TeV gamma-ray pulsar wind nebulae (PWN). To the south of HESS J1825-137,Fermi-LAT observation revealed a new region of GeV gamma-ray emission with three apparent peaks (termed here, GeV-ABC). This study presents interstellar medium (ISM) data and spectral energy distribution (SED) modelling towards the GeV emission to understand the underlying particle acceleration. We considered several particle accelerator scenarios – the PWN associated with HESS J1825-137, the progenitor SNR also associated with HESS J1825-137, plus the gamma-ray binary system LS 5039. It was found that the progenitor SNR of HESS J1825-137 has insufficient energetics to account for all GeV emission. GeV-ABC may be a reflection of an earlier epoch in the history of the PWN associated with HESS 1825-137, assuming fast diffusion perhaps including advection. LS 5039 cannot meet the required energetics to be the source of particle acceleration. A combination of HESS J1825-137 and LS 5039 could be plausible sources.