Search for molecular oxygen in VII ZW 31

Details Search for molecular oxygen in VII ZW 31 Search for molecular oxygen in VII ZW 31

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..718g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 718-721.

Astronomy and Astrophysics

Astronomy

18

Galaxies, Infrared Sources (Astronomy), Interstellar Matter, Molecular Clouds, Oxygen Spectra, Abundance, Line Spectra, Luminosity, Molecular Spectra

Scientific paper

A search has been carried out for emission from the 1(1)-1(0) transition of molecular oxygen from the infrared- and CO-luminous galaxy VII Zw 31. Its redshift results in the line being shifted from a rest frequency near 118.8 GHz, which is entirely blocked by O2 in the terrestrial atmosphere, to a frequency of 112.6 GHz, where atmospheric effects are quite small. The 1 sigma upper limit to the integrated intensity in a 250 km/s interval is 0.16 K km/s, which is 0.024 times the integrated intensity of the J = 1-0 CO transition. The resulting upper limit to the molecular oxygen column density is 8.4 x 10 to the 15th/sq cm, implying a 1 sigma upper limit to fractional abundance of O2 relative to H2 of 4 x 10 go the -6th. This is the most stringent upper limit on the molecular oxygen abundance obtained to date, and to the extent that the ISM of VII Zw 31 is similar to that of the Galaxy, significantly constrains chemical models of the ISM.

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