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Paper: Spectral-Line On-The-Fly at the IRAM 30 m Telescope
Volume: 217, Imaging at Radio Through Submillimeter Wavelengths
Page: 190
Authors: Ungerechts, H.; Brunswig, W.; Kramer, C.; Paubert, G.; Sievers, A.; Wild, W.
Abstract: We implemented spectral-line On-The-Fly (SLOTF) observing at the IRAM 30-m about three years ago. This observing mode is now producing fully sampled images of superb quality and with sizes not previously feasible with the 30-m. Representative results will be shown in this talk and elsewhere at this conference. With the current system we move the telescope beam across the source at a constant velocity, while data are taken (``dumped'') every 1 or 2 seconds. We can scan along the principal directions of any spherical coordinate system on the sky. Individual scan lines can have any length; they can be preceded and followed by off-source reference measurements. The receivers, backends, and atmosphere are sufficiently stable for SLOTF with rather long time periods between off-source reference measurements. We can use simultaneously up to 4 receivers and 12 spectrometer bands of the filterbanks and autocorrelators. A new version of the class software contains special extensions and features for SLOTF. You can get detailed and up-to-date information about SLOTF at the 30-m from the IRAM-Granada WWW site: <A HREF="">IRAM-Granada</A>. Faster and even more flexible OTF observing, for continuum as well as for spectral lines, will be a major feature of the future telescope control and data handling system for the 30-m, which we are planning now.
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