多环芳烃（PAHs）是含有相邻芳环的有机分子。红外发射波段表明，多环芳烃在太空中是丰富的，但在星际介质中只检测到少数特定的多环芳烃。研究者利用绿岸望远镜对致密星云TMC—1进行射电观测，发现了1—氰芘，一种四环多环芳烃芘相关的氰基取代衍生物。

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