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On the Detection of Phenalene, C<sub>13</sub>H<sub>10</sub>, in the ISM
C. Cabezas, M. Agúndez, C. Pérez, D. Villar-Castro, G. Molpeceres, D. Pérez, A. L. Steber, R. Fuentetaja, B. Tercero, N. Marcelino, A. Lesarri, P. de Vicente, and J. Cernicharo
reported on the
Discovery of Interstellar Phenalene (//c//-C<sub>13</sub>H<sub>10</sub>): A new Piece in the Chemical Puzzle of PAHs in Space
Astron. Astrophys. 701, Art. No. L8 (2025).
Phenalene was identified through a plethora of a-type rotational transitions, several series easier to detect because of oblate pairing of the transitions having the same Kc close to J. 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. A rotational temperature of 8 K was derived. The column density of phenalene appears to be slightly larger than that of the slightly smaller indene, albeit with considerable uncertainty.
Contributor(s): H. S. P. Müller; 09, 2025