彗星中的多环芳烃
PAHs in Comets: An Overview
摘要：
多环芳烃（PAH）分子，在我们自己和外部星系的星际介质（ISM）中随处可见，如果它们是由相对未加工的星际物质形成的，可能已经被纳入彗星。彗星中多环芳烃的检测将是ISM和彗星之间的重要联系。这篇评论汇编了我们目前对彗星多环芳烃的认识，基于对彗星红外振动和紫外荧光光谱的地面和空间观测，以及对可能来自彗星的行星际尘埃颗粒和由星尘号航天器返回地球的彗星样品的实验室分析。后者为彗星核中存在多环芳烃提供了最明确的证据。
英文摘要：
Polycyclic aromatic hydrocarbon (PAH) molecules, ubiquitously seen in the interstellar medium (ISM) of our own and external galaxies, might have been incorporated into comets if they are formed from relatively unprocessed interstellar matter. The detection of PAHs in comets would be an important link between the ISM and comets. This review compiles our current knowledge on cometary PAHs, based on ground-based and space-borne observations of infrared vibrational and ultraviolet fluorescence spectra of comets, and laboratory analysis of interplanetary dust particles possibly of cometary origin and cometary samples returned to Earth by the Stardust spacecraft. The latter provided the most unambiguous evidence for the presence of PAHs in cometary nuclei.
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