Extragalactic Detection of HC3N

R. Mauersberger, C. Henkel, and L. J. Sage,
Dense gas in nearby galaxies. III – HC3N 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,
Molecules in external galaxies – The detection of CN, C2H, and HNC, and the tentative detection of HC3N,
Astron. Astrophys. 201, L23–L26 (1988).


Detection of Extragalactic Vibrationally Excited HC3N

F. Costagliola and S. Aalto,
Vibrationally Excited HC3N 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 v7 = 1, J" = 9, 16, 24, and 27 and one component of v6 = 1, J" = 24 were detected as well.


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