Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..607c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 2, Aug. 1991, p. 607-612.
Astronomy and Astrophysics
Astrophysics
29
Abundance, Extragalactic Radio Sources, Interstellar Matter, Molecular Spectra, Oxygen, Oxygen Spectra, Absorption Spectra, Emission Spectra, Molecular Clouds, Stellar Envelopes
Scientific paper
A search for emission lines of molecular oxygen in interstellar space has been conducted using two ways to avoid the atmospheric absorption lines: (1) observation of the galaxy NGC 6240, for which the N(J) = 1(1)-1(0)O2 line at 118.7 GHz rest frequency is redshifted to 115.7 GHz, outside the main atmospheric blocking; (2) observation in two galactic dense clouds and toward an O-rich circumstellar envelope (OH 231.8 + 4.2) of the N(J) = 2(1)-0(1) 234 GHz line of the (O-16)(O-18) molecule, a frequency domain where the earth's atmosphere is also relatively transparent. None of these lines were detected, although the targets were specially chosen to contain O2 OH 231.8 + 4.2 because of its rich oxygen chemistry, and NGC 6240 because of extended powerful shocks that could desorb O2 from grains.
Casoli Fabienne
Combes François
Encrenaz Pierre
Gerin Maryvonne
Laurent Camille
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