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.
HIFI
Calibration
Sideband ratio
Herschel
Heterodyne
Author
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 2 433-452Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1007/s10686-014-9382-5