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arXiv 2209.03809astro-ph.HE
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一个PeVatron候选者:回旋镖星云的X射线波段模拟

A PeVatron Candidate: Modelling the Boomerang Nebula in X-ray Band

Xuan-Han Liang, Chao-Ming Li, Qi-Zuo Wu, Jia-Shu Pan, Ruo-Yu Liu

摘要:

脉冲星风星云(PWN)和与之相关的超新星遗迹(SNR)G106.3+2.7是LHAASO公布的超高能(UHE)伽马射线对应物的候选者之一。虽然扩展源LHAASO J2226+6057的质心偏离脉冲星的位置约$0.3^\circ$,但源部分覆盖了PWN。因此,我们不能完全排除部分UHE排放来自PWN的可能性。以往的研究主要集中在信噪比是否PeVatron,而忽略了高能PWN。在这里,我们通过研究回旋镖星云的X射线辐射来探索它成为PeVatron候选者的可能性。通过模拟注入PWN的相对论电子的扩散,我们拟合了X射线表面亮度和光子指数的径向分布。具有磁场$B=140μ$ G的溶液可以很好地再现所观察到的轮廓,并且意味着电子的IC散射的严重抑制。因此,根据LHAASO最近对蟹状星云的测量,如果未来的观测显示部分UHE发射来自PWN,则需要引入质子成分来解释UHE发射。从这个意义上说,回旋镖星云将是一个强子PeVatron。

英文摘要:

Pulsar wind nebula (PWN) Boomerang and the associated supernova remnant (SNR) G106.3+2.7 are among candidates for the ultra-high-energy (UHE) gamma-ray counterparts published by LHAASO. Although the centroid of the extended source, LHAASO J2226+6057, deviates from the pulsar's position by about $0.3^\circ$, the source partially covers the PWN. Therefore, we cannot totally exclude the possibility that a part of the UHE emission comes from the PWN. Previous studies mainly focus on whether the SNR is a PeVatron, while neglecting the energetic PWN. Here, we explore the possibility of the Boomerang Nebula being a PeVatron candidate by studying its X-ray radiation. By modelling the diffusion of relativistic electrons injected in the PWN, we fit the radial profiles of the X-ray surface brightness and the photon index. The solution with a magnetic field $B=140μ$G can well reproduce the observed profiles and implies a severe suppression of IC scattering of electrons. Therefore, a proton component need be introduced to account for the UHE emission, in light of recent LHAASO's measurement on Crab Nebula, if future observations reveal part of the UHE emission originating from the PWN. In this sense, Boomerang Nebula would be a hadronic PeVatron.

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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