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arXiv 2302.12679astro-ph.HE
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超新星遗迹G51 .26+0.11的GeV Gamma-ray辐射及其分子环境研究

A Study of GeV Gamma-ray Emission toward Supernova Remnant G51.26+0.11 and Its Molecular Environment

Wen-Juan Zhong, Xiao Zhang, Yang Chen, Qian-Qian Zhang

摘要:

我们重新分析了超新星遗迹(SNR)G51.26+0.11区域的费米LAT GeV $γ$射线发射,并利用CO线数据研究了其星际分子环境。在GeV能量下,基于13.2年的Fermi-LAT数据,在该区域观察到的扩展$γ$射线发射被分解为在0.2 $-$ 500 GeV下显著性为19.5 $σ$的均匀盘源(“Src A”)和显著性为4.2 $σ$的点源(4 FGL J1924.3+1628)。在角半径为$\sim$ 0.17 $^°$的情况下,“Src A”在视线中与SNR G51.26+0.11显著重叠。另一方面,SNR与$\sim$ +54 km s $^{-1}$分子云(MCs)之间的形态学一致性以及SNR边界附近的非对称或宽的$^{12}$ CO谱线轮廓为很可能的SNR-MC相互作用提供了证据。SNR-MC相互作用和HI吸收特征表明,SNR G51.26+0.11位于6.2 $\pm$ 0.5 kpc的运动学距离处。结合多波长分析的结果,SNR(“Src A”)的$γ$射线发射可以自然地用具有指数$\sim$ 2.25的软幂律质子谱的强子模型来解释。

英文摘要:

We reanalyze the Fermi-LAT GeV $γ$-ray emission in the region of supernova remnant (SNR) G51.26+0.11 and investigate its interstellar molecular environment with the CO-line data. At GeV energies, based on 13.2 years of Fermi-LAT data, the extended $γ$-ray emission observed in this region is resolved into a uniform-disk source ('Src A') with a significance of 19.5$σ$ and a point source (4FGL J1924.3+1628) with a significance of 4.2$σ$ in 0.2$-$500 GeV. With an angular radius of $\sim$ 0.17$^°$, 'Src A' overlaps with SNR G51.26+0.11 significantly in the line of sight. On the other hand, the morphological coincidence between the SNR and the $\sim$ +54 km s$^{-1}$ molecular clouds (MCs) together with the asymmetric or broad $^{12}$CO line profiles near the SNR boundary provides evidence for the very likely SNR-MC interaction. The SNR-MC interaction and the HI absorption features indicate that SNR G51.26+0.11 is located at a kinematic distance of 6.2 $\pm$ 0.5 kpc. Combined with the results from the multi-wavelength analysis, the $γ$-ray emission of the SNR ('Src A') can be naturally explained by a hadronic model with a soft power-law proton spectrum of index $\sim$ 2.25.

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