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Paper: Surveys with the New KOSMA Telescope
Volume: 217, Imaging at Radio Through Submillimeter Wavelengths
Page: 194
Authors: Kramer, C.; Beuther, H.; Simon, R.; Stutzki, J.; Winnewisser, G.
Abstract: The Kölner Observatorium für Submillimeter-Astronomie (KOSMA) has recently been equipped with a new 3m submm telescope. The current surface accuracy of the primary dish of ~30 microns, the excellent weather conditions at the telescope site, the Gornergrat in the Swiss Alps at 3150m altitude, and the dual-channel SIS receivers, allow to efficiently conduct observations between 210 and 820 GHz, covering all the high atmospheric windows accessible from ground based telescopes. Currently, we are concentrating on observing low- J and mid- J transitions of CO and its isotopomers to analyze the excitation conditions of the cold and warm interstellar medium. I will present maps of Cepheus B and other clouds, made in the newly implemented, very efficient, on-the-fly observing modus. The effect of continuously sampling the source will be discussed, in comparison to the traditional point-by-point raster mapping mode. In addition, I will present a method to correct for the emission detected in the extended errorbeam of a large telescope, e.g. the IRAM 30m telescope, by additional observations with e.g. the KOSMA 3m telescope. Furtheron, a flat fielding algorithm, developed to improve the calibration consistency of large raster maps made with single pixel receivers, may also serve to improve maps of multi-beam array receivers (Urs Graf, this conference) in the future.
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