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The effect of sideband ratio on line intensity for Herschel/HIFI

Higgins, Ronan and Teyssier, David and Borys, Colin and Braine, Jonathan and Comito, Claudia and Delforge, Bertrand and Helmich, Frank and Olberg, Michael and Ossenkopf, Volker and Pearson, John and Shipman, Russell (2014) The effect of sideband ratio on line intensity for Herschel/HIFI. Experimental Astronomy, 37 (2). pp. 433-452. ISSN 0922-6435.

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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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Ossenkopf, Volker0000-0002-8351-3877
Additional Information:© 2014 Springer Science+Business Media Dordrecht. Received: 15 October 2013; Accepted: 26 March 2014; Published online: 18 May 2014. We would like to thank Mihkel Kama from the CHESS team for his help in investigating the sideband ratio effect around the 557 GHz water line. Ronan Higgins would like to thank Netty Honingh for useful discussions on the origins of the sideband ratio imbalance in bands 1 and 2. The authors are grateful to the anonymous referee for valuable comments.
Subject Keywords:HIFI; Herschel; Heterodyne; Calibration; Sideband ratio
Issue or Number:2
Record Number:CaltechAUTHORS:20140829-084139110
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Official Citation:Higgins, R., Teyssier, D., Borys, C. et al. Exp Astron (2014) 37: 433. doi:10.1007/s10686-014-9382-5
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49049
Deposited By: Jason Perez
Deposited On:29 Aug 2014 19:57
Last Modified:03 Oct 2019 07:10

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