===== On the Detection of Propadienylidene, l-C3H2, 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:\\
**[[https://doi.org/10.1051/0004-6361/201117096|Molecules at //z// = 0.89: A 4-mm-Rest-Frame Absorption-Line Survey toward PKS 1830-211]]**\\
//Astron. Astrophys.// **535**, (2011) Art. No. A103.\\
Propadienylidene, //l//-C<sub>3</sub>H<sub>2</sub>, was identified by three //K<sub>a</sub>// = 1 //ortho// transitions (2 with //J"// = 2 and the lower //J"// = 3) and one with //K<sub>a</sub>// = 0 (//para//) and //J"// = 3. The OPR is compatible with the high temperature limit of 3. The abundance ratio //c//-C<sub>3</sub>H<sub>2</sub> to //l//-C<sub>3</sub>H<sub>2</sub> is about 25, between 3–5 in diffuse clouds, and 70 found in the dark cloud TMC-1.


----

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

----