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Spectral and Spatial Characterization and Calibration of FIFI-LS - The Field Imaging Spectrometer on SOFIA

Colditz, S. and Beckmann, S. and Bryant, A. and Fischer, C. and Fumi, F. and Geis, N. and Hamidouche, M. and Henning, T. and Hoenle, R. and Iserlohe, C. and Klein, R. and Krabbe, A. and Looney, L. and Poglitsch, A. and Raab, W. and Rebell, F. and Rosenthal, D. and Savage, M. and Schweitzer, M. and Vacca, W. (2018) Spectral and Spatial Characterization and Calibration of FIFI-LS - The Field Imaging Spectrometer on SOFIA. Journal of Astronomical Instrumentation, 7 (4), 1840004_1-1840004_16. World Scientific Publishing Co. doi: 10.1142/S2251171718400044. ISSN 2251-1717.

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Official URL: https://www.worldscientific.com/doi/pdf/10.1142/S2251171718400044


The field-imaging far-infrared line spectrometer (FIFI-LS) is a science instrument for the Stratospheric Observatory for Infrared Astronomy (SOFIA). FIFI-LS allows simultaneous observations in two spectral channels. The "blue" channel is sensitive from 51 um to 125 um and the "red" channel from 115 um to 203 um. The instantaneous spectral coverage is 1000–3000 km/s in the blue and 800–2500 km/s in the red channel with a spectral resolution between 150 km/s and 600 km/s. Each spectral channel observes a field of five by five spatial pixels on the sky. The pixel size in the blue channel is 6.14 by 6.25 square arc seconds and it is 12.2 by 12.5 square arc seconds in the red channel. FIFI-LS has been operating on SOFIA since 2014. It is available to the astronomical community as a facility science instrument. We present the results of the spectral and spatial characterization of the instrument based on laboratory measurements. This includes the measured spectral resolution and examples of the line spread function in the spectral domain. In the spatial domain, a model of the instrument's point spread function (PSF) and the description of a second pass ghost are presented. We also provide an overview of the procedures used to measure the instrument's ¯eld of view geometry and spectral calibration. The spectral calibration yields an accuracy of 15–60 km/s depending on wavelength.

Item URL in elib:https://elib.dlr.de/125712/
Document Type:Article
Title:Spectral and Spatial Characterization and Calibration of FIFI-LS - The Field Imaging Spectrometer on SOFIA
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Colditz, S.University of StuttgartUNSPECIFIED
Beckmann, S.University of StuttgartUNSPECIFIED
Bryant, A.University of StuttgartUNSPECIFIED
Fischer, C.University of StuttgartUNSPECIFIED
Fumi, F.University of StuttgartUNSPECIFIED
Geis, N.Max Planck Institute for Extraterrestrial PhysicsUNSPECIFIED
Hamidouche, M.mourad.hamidouche (at) dlr.deUNSPECIFIED
Henning, T.Max Planck Institute for AstronomyUNSPECIFIED
Hoenle, R.University of StuttgartUNSPECIFIED
Iserlohe, C.University of StuttgartUNSPECIFIED
Krabbe, A.University of StuttgartUNSPECIFIED
Looney, L.University of IllinoisUNSPECIFIED
Poglitsch, A.Max Planck Institute for Extraterrestrial PhysicsUNSPECIFIED
Rebell, F.University of StuttgartUNSPECIFIED
Savage, M.USRA - NASA Ames Research CenterUNSPECIFIED
Schweitzer, M.OHB System AGUNSPECIFIED
Journal or Publication Title:Journal of Astronomical Instrumentation
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1142/S2251171718400044
Page Range:1840004_1-1840004_16
Publisher:World Scientific Publishing Co
Keywords:Integral field spectroscopy, spectrometer, far-infrared, FIFI LS, FIFI-LS, SOFIA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Explorationsstudien (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Hamidouche, Mourad
Deposited On:09 Jan 2019 15:55
Last Modified:14 Dec 2019 04:25

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