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On the Detection of Cyanoacenaphtalenes, C<sub>16</sub>H<sub>9</sub>CN, in the ISM
G. Wenzel, I. R. Cooke, P. B. Changala, E. A. Bergin, S. Zhang, A. M. Burkhardt, A. N. Byrne, S. B. Charnley, M. A. Cordiner, M. Duffy, Z. T. P. Fried, H. Gupta, M. S. Holdren, A. Lipnicky, R. A. Loomis, H. T. Shay, C. N. Shingledecker, M. A. Siebert, D. A. Stewart, R. H. J. Willis, C. Xue, A. J. Remijan, A. E. Wendlandt, M. C. McCarthy, and B. A. McGuire
reported on the
Detection of Interstellar 1-Cyanopyrene: A Four-ring Polycyclic Aromatic Hydrocarbon
Science 386, 810−813 (2024).
The molecule was identified in the course of the GOTHAM survey of TMC-1 casrried out with the 100 m GBT dish. Several oblate paired a-type rotational transitions with 31 ≤ J ≤ 37 and Kc close to J. The derived column densities were equal, and a rotational temprerature of 9 K was derived. The authours also detected many lines of 1- and 2-cyanonaphtalene, again with equal column densities. Interestingly, the column densities of these slightly smaller molecules were about a factor of 1.7 lower than those of each of the cyanoacenaphtalenes.
The authors also search for the parent acenaphthylene molecule and cyanofluorene isomers, but found neither.
Contributor(s): H. S. P. Müller; 11, 2024