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arXiv 1807.01460astro-ph.HEastro-ph.SRhep-ph
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来自相互作用超新星的高能辐射:在致密的星周环境中对Cosmic-Ray加速的新限制

High-Energy Emission from Interacting Supernovae: New Constraints on Cosmic-Ray Acceleration in Dense Circumstellar Environments

Kohta Murase, Anna Franckowiak, Keiichi Maeda, Raffaella Margutti, John F. Beacom

摘要:

超新星与星周物质具有强相互作用,是高能中微子和γ射线的候选源,被认为是1 PeV以上银河系宇宙射线的重要贡献者。考虑到由SN喷出物的快速速度分量的冲击耗散,我们提出了全面的计算从SNe供电的冲击相互作用与密集的风或CSM的非热发射。值得注意的是,我们认为在辐射区的电磁级联和随后的衰减在预冲击CSM。这项工作提供了一个新的依赖于时间的唯象处方,使我们能够计算伽马射线,硬X射线,无线电和中微子信号,这源于宇宙射线加速的扩散冲击加速机制。我们将我们的结果应用于SN IIn 2010 jl和SN Ib/IIn 2014 C,其模型参数可以从多波长数据中确定。对于SN 2010 jl,更有希望的情况下,通过使用最新的费米大面积望远镜(LAT)Pass 8数据发布,我们推导出宇宙射线能量分数的新约束,<0.05-0.1。我们还发现,这些相互作用的SNe的后期无线电数据与我们的模型是一致的。进一步的多信使和多波长观测附近的相互作用SNe应该给我们新的见解扩散冲击加速在密集的环境中,以及前SN质量损失机制。

英文摘要:

Supernovae (SNe) with strong interactions with circumstellar material (CSM) are promising candidate sources of high-energy neutrinos and gamma rays, and have been suggested as an important contributor to Galactic cosmic rays beyond 1 PeV. Taking into account the shock dissipation by a fast velocity component of SN ejecta, we present comprehensive calculations of the non-thermal emission from SNe powered by shock interactions with a dense wind or CSM. Remarkably, we consider electromagnetic cascades in the radiation zone and subsequent attenuation in the pre-shock CSM. A new time-dependent phenomenological prescription provided by this work enables us to calculate gamma-ray, hard X-ray, radio, and neutrino signals, which originate from cosmic rays accelerated by the diffusive shock acceleration mechanism. We apply our results to SN IIn 2010jl and SN Ib/IIn 2014C, for which the model parameters can be determined from the multi-wavelength data. For SN 2010jl, the more promising case, by using the the latest Fermi Large Area Telescope (LAT) Pass 8 data release, we derive new constraints on the cosmic-ray energy fraction, <0.05-0.1. We also find that the late-time radio data of these interacting SNe are consistent with our model. Further multi-messenger and multi-wavelength observations of nearby interacting SNe should give us new insights into the diffusive shock acceleration in dense environments as well as pre-SN mass-loss mechanisms.

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