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The effect of sideband ratio on line intensity for Herschel/HIFI |
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| Authors: | Ronan Higgins David Teyssier Colin Borys Jonathan Braine Claudia Comito Bertrand Delforge Frank Helmich Michael Olberg Volker Ossenkopf John Pearson Russell Shipman |
| Institution: | 1. I. Physikalisches Institut, Universit?t zu K?ln, Zülpicher Strasse 77, 50937, K?ln, Germany 2. Herschel Science Centre, Herschel Science Centre, European Space Astronomy Centre (ESAC), P.O. Box 78, 28691, Villanueva de la Ca?ada, Madrid, Spain 3. California Institute of Technology, 1200 E California Blvd., MS 100-22 Pasadena, CA, 91125, USA 4. Observatoire de Bordeaux, LAB, 2 rue de l’Observatoire BP 89, 33270, Floirac, France 5. SRON Netherlands Institute for Space Research, Kapteyn Astronomical Institute, University of Groningen, PO-Box 800, 9700, AV, Groningen, The Netherlands 6. Onsala Space Observatory, Chalmers University of Technologym, 43992, Onsala, Sweden 7. Jet Propulsion Laboratory, Mail Stop 301-429, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA |
| Abstract: | The Heterodyne Instrument for the Far Infrared (HIFI) on board the Herschel Space Observatory is composed of a set of fourteen double sideband mixers. We discuss the general problem of the sideband ratio (SBR) determination and the impact of an imbalanced sideband ratio on the line calibration in double sideband heterodyne receivers. The HIFI SBR is determined from a combination of data taken during pre-launch gas cell tests and in-flight. The results and some of the calibration artefacts discovered in the gas cell test data are presented here along with some examples of how these effects appear in science data taken in orbit. |
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