Detection of H2/O-18/ and an abundance estimate for interstellar water

Details Detection of H2/O-18/ and an abundance estimate for interstellar water Detection of H2/O-18/ and an abundance estimate for interstellar water

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222l..59p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 222, June 1, 1978, p. L59-L62.

Astronomy and Astrophysics

Astrophysics

39

Abundance, Interstellar Matter, Molecular Excitation, Water, Clouds, Far Infrared Radiation, Gas Density, Gas Temperature, Molecular Spectra

Scientific paper

Detection is reported of the 3(13) - 2(20) (203.4075 GHz) transition of interstellar H2(O-18) in the molecular clouds of Orion and DR 21 (OH). An excitation calculation shows that far-infrared radiation from dust provides the primary mechanism for populating the 3(12) state, although collisions with the H2 gas are also of importance in the case of H2(O-16). The density of para-H2(O-18) in the Orion cloud is estimated as 0.004 per cu cm and that of water (ortho- and para-) as 8 per cu cm. The estimated H2O/H2 abundance ratio is about 1:100,000, implying that water is second only to CO in abundance among the trace molecules observed in molecular clouds.

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