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arXiv 0711.4173astro-ph
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古老超新星遗迹的非热辐射

Non-thermal emission from old supernova remnants

Jun Fang, Li Zhang

摘要:

在含时模型框架下研究了古老壳层型超新星遗迹的非热辐射。在该模型中,通过考虑加速质子与环境物质碰撞产生的二次$e^{\pm}$对的演化,可以数值计算一次电子、质子以及次级电子/正电子($e^{\pm}$)对的非热随时间变化的谱.对于给定信噪比的多波长光子谱可以通过轻子过程如电子/正电子同步辐射、韧致辐射和逆康普顿散射以及强子相互作用产生。我们的结果表明,二次$e^{\pm}$对的非热发射变得越来越突出,当SNR在辐射阶段老化时,因为初级电子的来源已经被切断,并且电子同步能量损失对于辐射SNR是显著的,而次级$e^{\pm}$对由于p-p相互作用的大的能量损失时间而可以在该相中长时间连续地产生。我们将该模型应用于两个老的信噪比G8.7 $-$ 0.1和G23.3 $-$ 0.3,预测结果可以解释观测到的两个源的多波长光子谱。

英文摘要:

We study the non-thermal emission from old shell-type supernova remnants (SNRs) on the frame of a time-dependent model. In this model, the time-dependent non-thermal spectra of both primary electrons and protons as well as secondary electron/positron ($e^{\pm}$) pairs can be calculated numerically by taking into account the evolution of the secondary $e^{\pm}$ pairs produced from proton-proton (p-p) interactions due to the accelerated protons collide with the ambient matter in an SNR. The multi-wavelength photon spectrum for a given SNR can be produced through leptonic processes such as electron/positron synchrotron radiation, bremsstrahlung and inverse Compton scattering as well as hadronic interaction. Our results indicate that the non-thermal emission of the secondary $e^{\pm}$ pairs is becoming more and more prominent when the SNR ages in the radiative phase because the source of the primary electrons has been cut off and the electron synchrotron energy loss is significant for a radiative SNR, whereas the secondary $e^{\pm}$ pairs can be produced continuously for a long time in the phase due to the large energy loss time for the p-p interaction. We apply the model to two old SNRs, G8.7$-$0.1 and G23.3$-$0.3, and the predicted results can explain the observed multi-wavelength photon spectra for the two sources.

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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