molecules:ism:cyanopyren

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molecules:ism:cyanopyren [2024/11/21 14:41] – muellermolecules:ism:cyanopyren [2025/02/24 16:11] (current) – mueller
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-===== On the Detection of Cyanoacenaphtalenes, C<sub>16</sub>H<sub>9</sub>CN, in the ISM =====+===== On the Detection of Cyanopyrenes, 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\\ 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\\
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 **[[https://doi.org/10.1126/science.adq6391|Detection of Interstellar 1-Cyanopyrene: A Four-ring Polycyclic Aromatic Hydrocarbon]]**\\ **[[https://doi.org/10.1126/science.adq6391|Detection of Interstellar 1-Cyanopyrene: A Four-ring Polycyclic Aromatic Hydrocarbon]]**\\
 //Science// **386**, 810−813 (2024).\\ //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 //K<sub>c</sub>// 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 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 CfA issued a **[[https://www.cfa.harvard.edu/news/astronomers-discover-new-building-blocks-complex-organic-matter|press release]]**.\\ 
 +\\
  
-The authors also search for the parent acenaphthylene molecule and cyanofluorene isomers, but found neither.\\+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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-Contributor(s): H. S. P. Müller; 11, 2024+Contributor(s): H. S. P. Müller; 11, 2024; 02, 2025
  
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