Submillimeter Heterodyne Detection of Interstellar Carbon Monoxide at 434 Micrometers
- 6 February 1981
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 211 (4482), 580-582
- https://doi.org/10.1126/science.211.4482.580
Abstract
A submillimeter heterodyne radiometer, developed for astronomical applications, uses an optically pumped laser local oscillator and a quasi-optical Schottky diode mixer. The resultant telescope-mounted system, which has a noise temperature less than 4000 K (double sideband) and high frequency and spatial resolution, has been used to detect the J = 6 → 5 rotational transition of carbon monoxide at 434 micrometers in the Orion molecular cloud. The measurements, when compared with previous millimeter-wave data, indicate that the broad carbon monoxide emission feature is produced by an optically thin gas whose temperature exceeds 180 K.Keywords
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