Atomic Oxygen in Molecular Clouds? High-Resolution Spectroscopy of the [O i 63 Micron Line toward DR 21

Details Atomic Oxygen in Molecular Clouds? High-Resolution Spectroscopy of the [O i 63 Micron Line toward DR 21 Atomic Oxygen in Molecular Clouds? High-Resolution Spectroscopy of the [O i 63 Micron Line toward DR 21

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...462l..43p&link_type=abstract

Astrophysical Journal Letters v.462, p.L43

Astronomy and Astrophysics

Astronomy

42

Infrared: Ism: Lines And Bands, Ism: Abundances

Scientific paper

We report the first high-resolution spectra of the [O I] 63 mu m fine-structure line toward DR 21. The observations were made from NASA's Kuiper Airborne Observatory using the MPE/UCB imaging spectrometer FIFI. The spectra show a pronounced dip, which may be due to absorption by a foreground molecular cloud, seen against the broad [O I] emission from DR 21. In this case we derive a column density of cold, atomic oxygen of >~ 5 x 1018 cm-2, corresponding to a relative abundance of atomic oxygen of [O]/[H] >~ 6 x 10-4. Therefore, most of the gas-phase oxygen in this cloud would be in atomic form. This result is in contrast to predictions by common chemistry models for a steady state cloud and may support models which predict a high abundance of atomic oxygen in dark cores of molecular clouds.

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