Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1874..300m&link_type=abstract
Conference Paper, SPIE Proceedings, Vol. 1874, p. 300-311.
Astronomy and Astrophysics
Astronomy
Radio Astronomy, Submillimeter Waves, Interstellar Matter, Spaceborne Astronomy, Molecular Clouds, Astronomical Spectroscopy, Atmospheric Attenuation
Scientific paper
The NASA program to explore the submillimeter wavelength range is reviewed, with emphasis on the Submillimeter Wave Astronomy Satellite (SWAS). During its planned three-year lifetime, SWAS is to survey dense molecular clouds and cloud cores within the Milky Way in five astrophysically important transitions of H2O, H2(O-18), O2, CI, and (C-13)O. The SWAS species along with the transition to be observed, its energy above the ground-state, its frequency and wavelength, and the critical density above which collision deexcitation of that transition becomes important are given. The SWAS telescope is a highly efficient off-axis Cassegrain antenna with a 54 x 68 cm diameter primary mirror and a small chopping secondary mirror. SWAS will employ two second harmonic Schottky diode mixers pumped by frequency-tripled Gunn oscillators. The SWAS spectrometer is a single acousto-optical spectrometer with 1400 1-MHz channels.
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