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| //Astron. Astrophys.// **701**, Art. No. L8 (2025).\\ | //Astron. Astrophys.// **701**, Art. No. L8 (2025).\\ |
| Phenalene was identified through several //a//-type rotational transitions, often series easier to detect because of oblate pairing of the transitions having the same //K<sub>c</sub>// close to //J// and then blended with weaker //b//-type transitions having equivalent quantum numbres. Some isolated //b//-type transitions were also assigned in the astronomical spectrum. The identifications were based on the QUIJOTE molecular line survey carried out with the Yebes 40 m radio telescope between 31.0 and 50.4 GHz, but phenalene assignments were made only up to 39.8 GHz. A rotational temperature of 8 K was derived. The column density of phenalene appears to be slightly larger than that of the lighter indene, albeit with considerable uncertainty.\\ | Phenalene was identified through several //a//-type rotational transitions, often series easier to detect because of oblate pairing of the transitions having the same //K<sub>c</sub>// close to //J// and then blended with weaker //b//-type transitions having equivalent quantum numbres. Some isolated //b//-type transitions were also assigned in the astronomical spectrum. The identifications were based on the QUIJOTE molecular line survey carried out with the Yebes 40 m radio telescope between 31.0 and 50.4 GHz, but phenalene assignments were made only up to 39.8 GHz. A rotational temperature of 8 K was derived. The column density of phenalene appears to be slightly larger than that of the lighter indene, albeit with considerable uncertainty.\\ |
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| | G. Wenzel, T. H. Speak, C. Xue, E. A. Bergin, A. M. Burkhardt, M. A. Cordiner, M. Duffy, Z. T. P. Fried, A. Lipnicky, C. N. Shingledecker, R. H. J. Willis, A. J. Remijan, M. C. McCarthy, B. A. McGuire, and I. R. Cooke\\ |
| | reported on the\\ |
| | **[[https://doi.org/10.3847/2041-8213/ae8757|Detection of the Polycyclic Aromatic Hydrocarbon Phenalene (C13H10) in the Very |
| | Low-luminosity Object MC27/L1521F]]**\\ |
| | //Astrophys. J. Lett.// **1006**, Art. No. L38 (2026).\\ |
| | The molecule was identified by line stacking of observations carried out with thw GBT 100 m dish. While the column density of phenalene is similar to the one in TMC-1 CP, but the phenalene/benzonitrile ratios differ. It is ~9 in TMC-1 CP, whereas it is ~40 in MC27/L1521F.\\ |
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| Contributor(s): H. S. P. Müller; 09, 2025 | Contributor(s): H. S. P. Müller; 09, 2025; 08, 2026. |
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