The effect of sideband ratio on line intensity for Herschel/HIFI
Artikel i vetenskaplig tidskrift, 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

Universität zu Köln

D. Teyssier

European Space Astronomy Centre (ESAC)

C. Borys

California Institute of Technology (Caltech)

J. Braine

Laboratoire d'Astrophysique de Bordeaux

C. Comito

Universität zu Köln

B. Delforge

Rijksuniversiteit Groningen

F. Helmich

Rijksuniversiteit Groningen

Michael Olberg

Computer support

V. Ossenkopf

Universität zu Köln

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

R. Shipman

Rijksuniversiteit Groningen

Experimental Astronomy

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

Vol. 37 2 433-452


Astronomi, astrofysik och kosmologi



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