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Session 17 - The Galactic Interstellar Gas.
Display session, Monday, January 13
Metropolitan Ballroom,
We have used the 30m IRAM millimeter radio telescope to search for two low-lying rotational transitions of the CO-H_2 dimer in the emission spectra of 3 Galactic sources and in the absorption spectrum of a low-latitude extragalactic continuum source. The transitions are the 111- \leftrightarrow 000+ line at 109.21 GHz, and the 110+ \leftrightarrow 101- line at 90.84 GHz. The search targets were the TMC 1 and L 134 dark clouds, the L 1157 bipolar outflow, and the compact radio continuum source 2013+370. The spectral search covered the frequency ranges from 90.58 - 91.10 GHz and from 108.95 - 109.46 GHz. Several known emission lines were found including HC_3N(12-11), HC_3N(10-9), OCS, SO, and HNC, but no other features were seen in the spectra. The rms noise was typically 5 mK per 1 MHz channel (\approx 3 km s^-1).
