title: Beam profile for the Herschel-SPIRE Fourier transform spectrometer.
abstract: One of the instruments on board the Herschel Space Observatory is the Spectral and Photometric Imaging Receiver (SPIRE). SPIRE employs a Fourier transform spectrometer with feed-horn-coupled bolometers to provide imaging spectroscopy. To interpret the resultant spectral images requires knowledge of the wavelength-dependent beam, which in the case of SPIRE is complicated by the use of multimoded feed horns. In this paper we describe a series of observations and the analysis conducted to determine the wavelength dependence of the SPIRE spectrometer beam profile.
authors.affiliation: Institute for Space Imaging Science, Department of Physics and Astronomy, University of Lethbridge, Lethbridge, Alberta, Canada. gibion.makiwa@uleth.ca
authors.forename: Gibion
authors.initials: G
authors.lastname: Makiwa
authors.forename: David A
authors.initials: DA
authors.lastname: Naylor
authors.forename: Marc
authors.initials: M
authors.lastname: Ferlet
authors.forename: Carl
authors.initials: C
authors.lastname: Salji
authors.forename: Bruce
authors.initials: B
authors.lastname: Swinyard
authors.forename: Edward
authors.initials: E
authors.lastname: Polehampton
authors.forename: Matthijs H D
authors.initials: MH
authors.lastname: van der Wiel