The explosion of a supernova releases almost instantaneously about 10$$^{51}$$51 ergs of mechanic energy, changing irreversibly the physical and chemical properties of large regions in the galaxies. The stellar ejecta, the nebula resulting from the powerful shock waves, and sometimes a compact stellar remnant, constitute a supernova remnant (SNR). They can radiate their energy across the whole electromagnetic spectrum, but the great majority are radio sources. Almost 70 years after the first detection of radio emission coming from an SNR, great progress has been achieved in the comprehension of their physical characteristics and evolution. We review the present knowledge of different aspects of radio remnants, focusing on sources of the Milky Way and the Magellanic Clouds, where the SNRs can be spatially resolved. We present a brief overview of theoretical background, analyze morphology and polarization properties, and review and critically discuss different methods applied to determine the radio spectrum and distances. The consequences of the interaction between the SNR shocks and the surrounding medium are examined, including the question of whether SNRs can trigger the formation of new stars. Cases of multispectral comparison are presented. A section is devoted to reviewing recent results of radio SNRs in the Magellanic Clouds, with particular emphasis on the radio properties of SN 1987A, an ideal laboratory to investigate dynamical evolution of an SNR in near real time. The review concludes with a summary of issues on radio SNRs that deserve further study, and analysis of the prospects for future research with the latest-generation radio telescopes.

中文翻译：

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来自超新星遗迹的无线电发射

超新星爆炸几乎瞬间释放出约 10$$^{51}$51 ergs 的机械能，不可逆转地改变了星系中大片区域的物理和化学性质。恒星抛射物，即由强大冲击波产生的星云，有时还有致密的恒星残骸，构成了超新星残骸 (SNR)。它们可以在整个电磁频谱范围内辐射能量，但绝大多数是无线电源。在首次检测到来自 SNR 的无线电发射近 70 年后，在理解它们的物理特性和演化方面取得了巨大进展。我们回顾了无线电残余不同方面的现有知识，重点关注银河系和麦哲伦星云的来源，其中 SNR 可以在空间上解决。我们简要概述了理论背景，分析了形态和极化特性，并回顾和批判性地讨论了用于确定无线电频谱和距离的不同方法。研究了 SNR 冲击与周围介质之间相互作用的后果，包括 SNR 是否可以触发新恒星形成的问题。介绍了多光谱比较的案例。一节专门回顾麦哲伦云中无线电 SNR 的最新结果，特别强调 SN 1987A 的无线电特性，SN 1987A 是近乎实时研究 SNR 动态演化的理想实验室。综述最后总结了值得进一步研究的射电信噪比问题，并分析了最新一代射电望远镜未来研究的前景。