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
Heterodyne
HIFI
Herschel
Calibration
Författare
R. Higgins
Universität zu Köln
D. Teyssier
Europeiska rymdorganisationen (ESA)
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
California Institute of Technology (Caltech)
R. Shipman
Rijksuniversiteit Groningen
Experimental Astronomy
0922-6435 (ISSN) 1572-9508 (eISSN)
Vol. 37 2 433-452Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
DOI
10.1007/s10686-014-9382-5