Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..248w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 1, April 1990, p. 248-251.
Astronomy and Astrophysics
Astrophysics
15
Abundance, Carbon Monoxide, Interstellar Gas, Molecular Clouds, Radio Telescopes, Submillimeter Waves, Charge Coupled Devices, Gallium Arsenides, Mixing Circuits, Schottky Diodes, Spatial Resolution
Scientific paper
The KOSMA (Koelner Observatorium fuer Submillimeter Astronomie) 3-m telescope on Gornergrat near Zermatt, Switzerland, has been successfully operated in the sub-mm region for observations of the J = 3-2 transition of CO at 345.8 GHz from December 1988 through April 1989. The observations were carried out with a GaAs Schottky mixer receiver which has a system temperature of 600 K (DSB). The excellent weather conditions are demonstrated by a total content of precipitable water frequently less than 2 mm, and 20 percent of the time reaching below 1 mm, sometimes as low as 0.5 mm. The telescope reflector surface was manufactured to be within 30 microns (rms) of the ideal paraboloid and thus well suited for sub-mm observations. Pointing accuracy has been improved with the aid of an optical telescope to 14 arcsec (rms) in azimuth and elevation. Representative spectra from molecular clouds, some of which have been mapped extensively, are shown.
Hernichel J.
Miller Matthew
Schieder Rudolf
Ungerecht Sh.
Winnewisser Gisbert
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