Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...539l.123g&link_type=abstract
The Astrophysical Journal, Volume 539, Issue 2, pp. L123-L127.
Astronomy and Astrophysics
Astronomy
61
Ism: Clouds, Ism: Molecules
Scientific paper
We have used the Submillimeter Wave Astronomy Satellite (SWAS) to carry out deep integrations on the NJ=33-->12 transition of O2 in a variety of Galactic molecular clouds. We here report no convincing detection in an initial set of observations of 20 sources. We compare O2 integrated intensities with those of C18O in a similarly sized beam and obtain 3 σ upper limits for the O2/C18O abundance ratio <=2.3 in four clouds and <=3.6 in five additional clouds. Our lowest individual limit corresponds to N(O2)/N(H2)<2.6×10-7 (3 σ). A combination of data from nine sources yields
Ashby Matthew L. N.
Bergin Edwin A.
Chin Gordon
Erickson Neal R.
Goldsmith Paul F.
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