On the Detection of Propynylidyne, l-C3H, in Extragalactic Sources

S. Muller, A. Beelen, M. Guélin, S. Aalto, J. H. Black, F. Combes, S. J. Curran, P. Theule, and S. N. Longmore
used the Australia Telescope Compact Array (ATCA) to study the molecular content of a foreground galaxy at z = 0.89 (FG0.89 consisting of two subsources, FG0.89SW and FG0.89NO) in absorption toward the quasar PKS 1830-211:
Molecules at z = 0.89: A 4-mm-Rest-Frame Absorption-Line Survey toward PKS 1830-211
Astron. Astrophys. 535, (2011) Art. No. A103.
Propynylidyne, l-C3H, was identified by its J = 7/2 – 5/2 transition of the lower energy fine structure component 2Π1/2 with a rest frequency of 76.2 GHz. The Λ-doubling was marginally resolved, the H-hyperfine structure was not resolved. The detection can probably be viewed as secure because of the strong signal and the moderate line number density.

Contributor(s): H. S. P. Müller; 5, 2012