===== On Extragalactic HNC =====

C. Henkel, P. Schilke, and R. Mauersberger\\
reported on\\
**[[https://ui.adsabs.harvard.edu/abs/1988A%26A...201L..23H|Molecules in External Galaxies – The Detection of CN, C<sub>2</sub>H, and HNC, and the Tentative detection of HC<sub>3</sub>N]]**,\\
//Astron. Astrophys.// **201**, L23–L26 (1988).\\
The IRAM 30 m telescope was used to detect the //J// = 1 – 0 transition near 90.7 GHz in emission in the starburst galaxy IC 342.

Soon thereafter,\\
R. Mauersberger and C. Henkel\\
reported on\\
**[[https://ui.adsabs.harvard.edu/abs/1991A%26A...245..457M|Dense Gas in Nearby Galaxies. IV – The Detection of N<sub>2</sub>H<sup>+</sup>, SiO, H<sup>13</sup>CO<sup>+</sup>, H<sup>13</sup>CN, and HN<sup>13</sup>C]]**,\\
//Astron. Astrophys.// **245**, 457–466 (1991).\\
The IRAM 30 m telescope was used to detect the //J// = 1 – 0 transition near 87.1 GHz in emission in the Seyfert galaxy NGC 253.

F. Costagliola, S. Aalto, K. Sakamoto, S. Martín, R. Beswick, S. Muller, and H.-R. Klöckner\\
carried out a\\
**[[https://doi.org/10.1051/0004-6361/201220634|High-resolution mm and cm Study of the Obscured LIRG NGC 4418 – A Compact Obscured Nucleus Fed by In-falling Gas ?]]**,\\
//Astron. Astrophys.// **565**, Art. No. A66 (2013).\\
Vibrationally excited HNC was detected for the first time with the SMA. the //J// = 3 – 2 transition of //v//<sub>2</sub> = 1 was detected. The //e//-component appeared as a weak shoulder to the ground state emission line, whereas the //f//-component was essentially not overlapped.


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Contributors: S. Thorwirth; 09/2005; H. S. P. Müller; 01, 2014

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