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arXiv 2109.05784astro-ph.HE
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模拟SN 1987 A的非热发射

Modeling non-thermal emission from SN 1987A

Robert Brose, Jonathan Mackey, Sean Kelly, Nathan Grin, Luca Grassitelli

摘要:

SN 1987 A的残骸是同类研究中最好的物体。它在整个电磁波谱中的热发射和非热发射的丰富数据集为粒子加速理论的阐述提供了一个独特的测试平台。我们使用2D模拟的祖先的风,以获得流体剖面周围的超新星爆炸的介质。沿周围介质的突出特点的各种锥,然后在我们的时间依赖性加速代码RATPaC模拟SN 1987 A的排放的演变,并将其与观测数据进行比较。我们解决了宇宙射线的运输和流体动力学流,在测试粒子limit.The模拟代码依赖于1D的配置文件,但大的扩展速度的年轻的残余呈现横向运输不重要。我们发现,热X射线发射的增加早于低能伽马射线亮度的增加几年。在较低能量下伽马射线亮度的增加之后是在最高能量下的平稳增加。最高能量的伽马射线光谱在增亮过程中显得柔和,但随着赤道环中更多的物质受到冲击而变硬。当信噪比冲击波通过赤道面的峰值密度区时,X射线和γ射线的亮度几乎保持不变。

英文摘要:

The remnant of SN 1987A is the best-studied object of its kind. The rich data-set of its thermal and non-thermal emission across the electromagnetic spectrum poses a unique testbed for the elaboration of particle-acceleration theory. We use 2D simulations of the progenitor's wind to obtain hydro-profiles for the medium around the supernova explosion. Various cones along prominent features of the ambient medium are then used in our time-dependent acceleration code RATPaC to model the evolution of the emission of SN 1987A and compare it to observational data. We solve for the transport of cosmic rays and the hydrodynamical flow, in the test-particle limit.The simulation code relies on 1D profiles but the large expansion speed of the young remnant renders lateral transport unimportant. We find that the increase in thermal X-ray emission predates the increase in the low-energy gamma-ray brightness by several years. The increase of the gamma-ray brightness at lower energies is followed by a smooth increase at the highest energies. The gamma-ray spectrum at the highest energies appears soft during the brightening but hardens as more material in the equatorial ring gets shocked. The X-ray and gamma-ray brightness remain almost constant once the SNR blast-wave passed the region of peak-density in the equatorial plane.

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