The effect of sideband ratio on line intensity for Herschel/HIFI
Journal article, 2014

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.



Sideband ratio




R. Higgins

University of Cologne

D. Teyssier

European Space Astronomy Centre (ESAC)

C. Borys

California Institute of Technology (Caltech)

J. Braine

Laboratoire d'Astrophysique de Bordeaux

C. Comito

University of Cologne

B. Delforge

University of Groningen

F. Helmich

University of Groningen

Michael Olberg

Computer support

V. Ossenkopf

University of Cologne

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

R. Shipman

University of Groningen

Experimental Astronomy

0922-6435 (ISSN) 1572-9508 (eISSN)

Vol. 37 2 433-452

Subject Categories

Astronomy, Astrophysics and Cosmology



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