星暴星系的多频观测
A multifrequency view of starburst galaxies
摘要：
在过去的几年中，费米伽马射线太空望远镜（GeV范围）和成像空气切伦科夫望远镜（TeV范围）可以首次观测到能量>GeV的星暴星系。最近的两个星暴，M82和NGC 253被发现，最近，两个星暴-塞弗特复合物（NGC 1068和NGC 4945）的检测报告。这两次恒星爆发的辐射最好用强子相互作用来解释，从而为研究星系中宇宙射线的作用提供了第一个独特的机会。本文通过讨论从射电辐射到TeV能量的整个非热频率范围，评述了宇宙射线在星系非热成分中的作用。特别是，无线电发射所产生的电子同步辐射的解释被预测为相关的TeV发射来自加速强子的相互作用。这是观察到的少数对象已知的TeV能量，但相关性需要建立显着更高的统计。展望了用分子离子示踪宇宙射线的可能性。
英文摘要：
During the past few years, first observations of starburst galaxies at >GeV energies could be made with the Fermi Gamma-ray Space Telescope (GeV range) and Imaging Air Cherenkov Telescopes (TeV range). The two nearest starbursts, M82 and NGC253 were detected, and most recently, the detection of two starburst-Seyfert composites (NGC1068 and NGC4945) were reported. The emission for the two starbursts is best explained by hadronic interactions, and thus providing a first, unique opportunity to study the role of cosmic rays in galaxies. In this paper, the role of cosmic rays for the non-thermal component of galaxies is reviewed by discussing the entire non-thermal frequency range from radio emission to TeV energies. In particular, the interpretation of radio emission arising from electron synchrotron radiation is predicted to be correlated to TeV emission coming from interactions of accelerated hadrons. This is observed for the few objects known at TeV energies, but the correlation needs to be established with significantly higher statistics. An outlook of the possibility of tracing cosmic rays with molecular ions is given.
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