Low interstellar abundance of O2 confirmed by the PIROG 8 balloon experiment

Details Low interstellar abundance of O2 confirmed by the PIROG 8 balloon experiment Low interstellar abundance of O2 confirmed by the PIROG 8 balloon experiment

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...339l..81o&link_type=abstract

Astronomy and Astrophysics, v.339, p.L81-L84 (1998)

Astronomy and Astrophysics

Astrophysics

20

Interstellar Medium: Abundances, Interstellar Medium: Clouds, Interstellar Medium: Molecules, Interstellar Medium: Individual Objects: Ngc7538, W51, Radio Lines: Interstellar Medium

Scientific paper

Using a balloon-borne 60 cm telescope equipped with an SIS receiver we have searched for the 425 GHz molecular oxygen line in the NGC7538 and the W51 regions. The experiment was technically successful (confirmed by the detection of the (13) CO (4-3) line at 440 GHz), but we failed to detect emission from molecular oxygen. The inferred upper limits of the O2/CO ratio are 0.04 and 0.05 (3 sigma ) for the two regions, which are the lowest upper limits so far determined for Galactic clouds.

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