Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995opten..34.2701d&link_type=abstract
Optical Engineering 34(09), 2701-2711, Brian J. Thompson; Ed.
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
The 3-m KOSMA telescope at Gornergrat (Switzerland) is dedicated to millimeter- and submillimeter-wave astrophysics with observations mainly of interstellar atomic and molecular lines. This includes measurement of the large-scale structure and dynamics of molecular clouds in our galaxy for a better understanding of the processes connected with star formation. The present research activity of the observatory is described with a special scope on the description of the techniques and instrumentation used. The site a Gornergrat has superb atmospheric transparency, thus allowing operation up into the highest-frequency atmospheric window at around 850 GHz. We discuss the rapid development of sensitive superconductor-insulator-superconductor mixer elements, now covering frequencies well up into the submillimeterwave range with close to quantum-limit detection. As frequency-analyzing devices we exclusively use acousto-optical spectrometers at KOSMA. Progress into the submillimeter spectral range is complemented by the now mature technique of building radiotelescopes with sufficient surface accuracy to guarantee operation into the terahertz region ((lambda) equals 200 micrometers ). A new 3-m reflector for the KOSMA telescope with an expected surface accuracy of 10 micrometers is under construction.
Degiacomi Cuno G.
Schieder Rudolf
Stutzki Juergen
Winnewisser Gisbert F.
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