Millimeter continuum observations at the Italian infrared telescope on the Gornergrat

Astronomy and Astrophysics – Astronomy

Scientific paper

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Continuous Radiation, Infrared Astronomy, Infrared Telescopes, Millimeter Waves, Molecular Clouds, Calibrating, Photometers, Semiconductor Devices, Switzerland

Scientific paper

A new instrument for the detection of millimeter radiation, mounted at the Cassegrain focus of the 1.5 m, F/20 Italian Infrared Telescope, TIRGO, is described. The detector is a composite GaGe bolometer with F/4 field optics, with an uncooled focal adaptor. At the Gornergrat Observatory in April 1982, Jupiter, Mars, and Saturn were observed and used as primary standards. In spite of the high atmospheric water vapor content (about 6 mm), the molecular cloud W49 was detected at a level of 1200 + or - 300 Jy with a beam size of 3 arcmin HPBW at a wavelength of 1 mm. The integrated energy distribution of W 49, obtained from the observation and from previous results at shorter wavelengths, was compared with a hot-centered cloud model by Rowan-Robinson (1980).

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