===== Extragalactic Detection of HC3N =====

R. Mauersberger, C. Henkel, and L. J. Sage,\\
**[[https://ui.adsabs.harvard.edu/abs/1990A%26A...236...63M|Dense gas in nearby galaxies. III – HC<sub>3</sub>N as an extragalactic density probe]]**,\\
//Astron. Astrophys.// **236**, 63–68 (1990).

Source(s): NGC 253\\
Facility: IRAM 30 m\\


Comments:\\
Six transitions were observed between 81.8 and 236.6 GHz with quantum numbers //J"// = 8, 9, 11, 14, 15, and 25.\\
A tentative detection of the //J// = 10 – 9 transition toward IC342 or M82 with the IRAM 30 m telescope had been reported previously:\\
C. Henkel, R. Mauersberger, and P. Schilke,\\
**[[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).


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==== Detection of Extragalactic Vibrationally Excited HC3N ====

F. Costagliola and S. Aalto,\\
**[[https://doi.org/10.1051/0004-6361/200913370|Vibrationally Excited HC<sub>3</sub>N in NGC 4418]]**,\\
//Astron. Astrophys.// **515**, Art. No. A71 (2010).

Source(s): NGC 4418\\
Facility: IRAM 30 m; JCMT\\


Comments:\\
This seems to be the first report on the detection of a vibrationally excited molecule in an Extragalactic source. The //J"// = 9, 15, 16, 24, 27, 29, and 37 between 90.9 and 345.6 GHz were observed for the ground vibrational state; six of the eight components of //v//<sub>7</sub> = 1, //J"// = 9, 16, 24, and 27 and one component of //v//<sub>6</sub> = 1, //J"// = 24 were detected as well.


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Contributor(s): S. Thorwirth; 09/2005; H. S. P. Müller, 07, 2010

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