Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..535m&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)535-(12)544
Astronomy and Astrophysics
Astronomy
3
Astronomical Spectroscopy, Chemical Composition, Experiment Design, Functional Design Specifications, Mission Planning, Radio Astronomy, Submillimeter Waves, Atmospheric Attenuation, Atomic Spectra, Carbon, Hydrides, Interstellar Gas, Molecular Spectra, Oxygen, Water
Scientific paper
The submillimeter wavelength range (lambda greater than or equal to 100 micrometers and less than or equal to 1 mm) is exceptionally rich in atomic and molecular transitions that provide direct measures of the chemical composition, temperature, density, and cooling of the interstellar medium. In part, this is due to the fact that the most abundant oxygen- and carbon-bearing species as well as the most common hydrides have their lowest lying transitions within this wavelength region. However, because of the great abundance of many of these same species in our own atmosphere (e.g., H2O and O2), terrestrial absorption at submillimeter wavelengths is strong, rendering much of the sky inaccessible to ground- and even airborne observing platforms. In recognition of the scientific importance of the submillimeter range to astronomy and the limitations placed on its pursuit by the atmosphere, both NASA and ESA have embarked on ambitious programs to explore these wavelengths from space.
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