On the Detection of Ethanal, CH3CHO, 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.
5 ΔKa = 0 transitions with Ka ≤ 1 and J" = 2 and 3 were detected between rest frequencies of 57.7 and 79.2 GHz. All transitions show resolved CH3-internal rotation splitting. One component of the lowest frequency transition is hidden in the noise.

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