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| molecules:ism:cyanocoronen [2025/05/15 13:49] – created mueller | molecules:ism:cyanocoronen [2025/05/15 14:03] (current) – mueller |
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| G. Wenzel, S. Gong, C. Xue, P. B. Changala, M. S. Holdren, T. H. Speak, D. A. Stewart, Z. T. P. Fried, R. H. J. Willis, E. A. Bergin, A. M. Burkhardt, A. N. Byrne, S. B. Charnley, A. Lipnicky, R. A. Loomis, C. N. Shingledecker, I. R. Cooke, M. C. McCarthy, A. J. Remijan, A. E. Wendlandt, and B. A. McGuire\\ | G. Wenzel, S. Gong, C. Xue, P. B. Changala, M. S. Holdren, T. H. Speak, D. A. Stewart, Z. T. P. Fried, R. H. J. Willis, E. A. Bergin, A. M. Burkhardt, A. N. Byrne, S. B. Charnley, A. Lipnicky, R. A. Loomis, C. N. Shingledecker, I. R. Cooke, M. C. McCarthy, A. J. Remijan, A. E. Wendlandt, and B. A. McGuire\\ |
| a<nnounced the\\ | a<nnounced the\\ |
| **[[https://doi.org/10.3847/2041-8213/adc911|Discovery of the Seven-ring Polycyclic Aromatic Hydrocarbon Cyanocoronene (C24H11CN) in GOTHAM Observations of TMC-1]]**\\ | **[[https://doi.org/10.3847/2041-8213/adc911|Discovery of the Seven-ring Polycyclic Aromatic Hydrocarbon Cyanocoronene (C<sub>24</sub>H<sub>11</sub>CN) in GOTHAM Observations of TMC-1]]**\\ |
| //Astrophys. J. Lett.// **984**, Art. No. L36 (2025).\\ | //Astrophys. J. Lett.// **984**, Art. No. L36 (2025).\\ |
| 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 //K<sub>c</sub>// close to //J//. Each pair of lines is close to the noise limit, but stacking achieves a S/N of about 7. The derived column density is, for example, about twice that of each of 1- and 2-cyanonaphtalene and only slightly less than that of benzonitrile.\\ | The molecule was identified in the course of the GOTHAM survey of TMC-1 carried out with the 100 m GBT dish. Several oblate paired //a//-type rotational transitions were observed. Several of these had an S/N of about 3; stacking improved the result. The derived column density is comparable to many related aromatic cyano derivatives, highest among individual presently known ones. A rotational temperature of 6 K was derived with great accuracy.\\ |
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| G. Wenzel, T. H. Speak, P. B. Changala, R. H. J. Willis, A. M. Burkhardt, S. Zhang, E. A. Bergin, A. N. Byrne, S. B. Charnley, Z. T. P. Fried, H. Gupta, E. Herbst, M. S. Holdren, A. Lipnicky, R. A. Loomis, C. N. Shingledecker, C. Xue, A. J. Remijan, A. E. Wendlandt, M. C. McCarthy, I. R. Cooke, and B. A. McGuire\\ | |
| announced the\\ | |
| **[[https://doi.org/10.1038/s41550-024-02410-9|Detections of Interstellar Aromatic Nitriles 2-Cyanopyrene and 4-Cyanopyrene in TMC-1]]**\\ | |
| //Nat. Atron.// **9**, 262−270 (2025).\\ | |
| The isomers of 1-cyanopyrene were detected in a manner very similar to this one. The derived column densities of 1-cyanopyrene : 2-cyanopyrene : 4-cyanopyrene are compatible with the 4 : 2 : 4 ratios of the number of equivalent substitution positions in pyrene.\\ | |
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