美国麻省理工学院Brett A. McGuire研究团队报道了星际1-芘甲腈检测——一种四环多环芳烃。相关研究成果于2024年10月24日发表在《科学》。

多环芳烃（PAHs）是含有相邻芳香环的有机分子。红外发射带显示，多环芳烃在太空中含量丰富，但在星际介质中只检测到少数特定的多环芳烃。

研究人员使用Green Bank Telescope在密云TMC-1的射电观测中检测到1-芘甲腈，这是一种相关多环芳烃芘的氰基取代衍生物。

1-芘甲腈的实测柱密度约为1.52×10¹²cm^-2，因此，估计芘在TMC-1中的碳含量高达0.1%。这种丰度表明，星际多环芳烃化学有利于芘的产生。研究认为，供应给年轻行星系统的一些碳是由起源于冷分子云的多环芳烃携带的。

附：英文原文

Title: Detection of interstellar 1-cyanopyrene: A four-ring polycyclic aromatic hydrocarbon

Author: Gabi Wenzel, Ilsa R. Cooke, P. Bryan Changala, Edwin A. Bergin, Shuo Zhang, Andrew M. Burkhardt, Alex N. Byrne, Steven B. Charnley, Martin A. Cordiner, Miya Duffy, Zachary T. P. Fried, Harshal Gupta, Martin S. Holdren, Andrew Lipnicky, Ryan A. Loomis, Hannah Toru Shay, Christopher N. Shingledecker, Mark A. Siebert, D. Archie Stewart, Reace H. J. Willis, Ci Xue, Anthony J. Remijan, Alison E. Wendlandt, Michael C. McCarthy, Brett A. McGuire

Issue&Volume: 2024-10-24

Abstract: Polycyclic aromatic hydrocarbons (PAHs) are organic molecules containing adjacent aromatic rings. Infrared emission bands show that PAHs are abundant in space, but only a few specific PAHs have been detected in the interstellar medium. We detect 1-cyanopyrene, a cyano-substituted derivative of the related four-ring PAH pyrene, in radio observations of the dense cloud TMC-1 using the Green Bank Telescope. The measured column density of 1-cyanopyrene is ~1.52×1012cm-2, from which we estimate that pyrene contains up to 0.1% of the carbon in TMC-1. This abundance indicates that interstellar PAH chemistry favors the production of pyrene. We suggest that some of the carbon supplied to young planetary systems is carried by PAHs that originate in cold molecular clouds.

DOI: adq6391

Source: https://www.science.org/doi/10.1126/science.adq6391