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arXiv 2104.09491astro-ph.HEhep-ph
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Sub-PeV弥散星系Gamma-Ray辐射的多信使意义

Multi-messenger Implications of Sub-PeV Diffuse Galactic Gamma-Ray Emission

Ke Fang, Kohta Murase

摘要:

西藏AS $γ$协作组最近测量了0.1 - 1 PeV的弥散银河γ射线通量。通量和光谱与银河宇宙射线与星际介质(ISM)之间的强子核相互作用的中性π介子衰变一致。我们从产生伽马射线的相同相互作用过程中推导出银河系漫射中微子发射的通量。我们的计算考虑了银河系内部伽马射线衰减的影响以及由于宇宙射线的光谱和分布、气体密度和ISM的红外发射造成的不确定性。我们发现银河面对全天中微子流的贡献是$\lesssim5-10\%$,约为100 TeV。在银道面区域,银河系和河外中微子的强度是相当的。我们的结果与IceCube和ANTARES合作报告的上限一致,并预测下一代中微子实验可能会观察到银河系成分。我们还表明,西藏AS $γ$的数据意味着在宇宙射线核子谱或离散源的贡献,包括Pevatron,如超泡和超新星遗迹,和PeV电子加速器的额外组件。未来在1 TeV和1 PeV之间的多信使观测对于分解亚PeV伽马射线的起源至关重要。

英文摘要:

The diffuse Galactic gamma-ray flux between 0.1 and 1 PeV has recently been measured by the Tibet AS$γ$ Collaboration. The flux and spectrum are consistent with the decay of neutral pions from hadronuclear interactions between Galactic cosmic rays and the interstellar medium (ISM). We derive the flux of the Galactic diffuse neutrino emission from the same interaction process that produces the gamma rays. Our calculation accounts for the effect of gamma-ray attenuation inside the Milky Way and uncertainties due to the spectrum and distribution of cosmic rays, gas density, and infrared emission of the ISM. We find that the contribution from the Galactic plane to the all-sky neutrino flux is $\lesssim5-10\%$ around 100 TeV. The Galactic and extragalactic neutrino intensities are comparable in the Galactic plane region. Our results are consistent with the upper limit reported by the IceCube and ANTARES Collaborations, and predict that next-generation neutrino experiments may observe the Galactic component. We also show that the Tibet AS$γ$ data imply either an additional component in the cosmic-ray nucleon spectrum or contribution from discrete sources, including Pevatrons such as superbubbles and hypernova remnants, and PeV electron accelerators. Future multi-messenger observations between 1 TeV and 1 PeV are crucial to decomposing the origin of sub-PeV gamma rays.

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