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arXiv 2111.04656astro-ph.HE
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作为PeV中微子有效发射源的河外毫秒双星

Newly born extragalactic millisecond pulsars as efficient emitters of PeV neutrinos

Rajat K. Dey, Animesh Basak, Sabyasachi Ray, Tamal Sarkar

摘要:

在2010 - 2017年期间,在冰立方实验中检测到的宇宙起源PeV中微子的扩散通量的来源仍然不明。一个人口的河外新生的快速自旋中微子作为可能的候选人产生PeV的能量标度的中微子进行了调查。采用两步粒子加速机制将恒星旋转产生的能量传递给高能电子。电子可能会被提升到$\approx 0.01$ EeV能量或更高,当这些电子与加速区中的低能正电子和软辐射相互作用时,会产生超高能(UHE)中微子和伽马射线。理论推导的河外扩散μ介子中微子通量在能量范围[1-10] PeV被发现符合冰立方水平,如果只有一小部分($η_{k} \approx 0.31\%$)的总辐射光度的恒星转移到能源PeV中微子。利用上述宇宙线电子载荷参数$η_{k}$的值,可以从该模型预测来自软辐射场中的UHE电子的逆康普顿散射的漫射伽马射线通量。

英文摘要:

The origins of the diffuse flux of cosmogenic PeV neutrinos detected in the IceCube experiment during 2010 - 2017 remain unidentified. A population of extragalactic newly born fast spinning pulsars are investigated as possible candidates for generating the PeV energy scale neutrinos. A two-step mechanism of particle acceleration is adopted for transferring energy from star rotation to high energy electrons. Electrons might be boosted up to $\approx 0.01$ EeV energies and above, and produce ultra-high-energy (UHE) neutrinos and gamma rays when these electrons interact with low energy positrons and soft radiations in the acceleration zone. The theoretically derived extragalactic diffuse muon neutrino flux in the energy range [1-10] PeV is found consistent with the IceCube level if only a fraction ($η_{k} \approx 0.31\%$) of the total bolometric luminosity of pulsars are transferred to power the PeV neutrinos. Using the above value of the cosmic ray electron loading parameter $η_{k}$, the diffuse gamma ray flux from inverse Compton scattering off UHE electrons in the soft radiation field might be predicted from the model.

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