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

Author:

Colditz Sebastian1,Beckmann Simon1,Bryant Aaron2,Fischer Christian1,Fumi Fabio2,Geis Norbert3,Hamidouche Mourad4,Henning Thomas5,Hönle Rainer2,Iserlohe Christof1,Klein Randolf6,Krabbe Alfred12,Looney Leslie7,Poglitsch Albrecht3,Raab Walfried8,Rebell Felix2,Rosenthal Dirk9,Savage Maureen610,Schweitzer Mario11,Vacca William6

Affiliation:

1. Deutsches SOFIA Institut, University of Stuttgart, 70569 Stuttgart, Germany

2. Institute of Space Systems, University of Stuttgart, 70569 Stuttgart, Germany

3. Max Planck Institute for Extraterrestrial Physics, 85748 Garching, Germany

4. Remote Sensing Technology Institute, DLR (German Aerospace Center), 82234 Wessling, Germany

5. Max Planck Institute for Astronomy, 69117 Heidelberg, Germany

6. SOFIA-USRA, NASA Ames Research Center, Moffett Field, CA94035, USA

7. Department of Astronomy, University of Illinois, Urbana, IL, 61801, USA

8. ESTEC, European Space Agency, 69117, Nordwijk, 2201 AZ, The Netherlands

9. OSRAM GmbH, Industriestraße 20B, 85072 Eichstätt, Germany

10. UC Observatories, 1156 High Street, Santa Cruz, CA, 95064, USA

11. OHB System AG, 822234 Wessling, Germany

Abstract

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[Formula: see text][Formula: see text]m to 125[Formula: see text][Formula: see text]m and the “red” channel from 115[Formula: see text][Formula: see text]m to 203[Formula: see text][Formula: see text]m. The instantaneous spectral coverage is 1000–3000[Formula: see text]km/s in the blue and 800–2500[Formula: see text]km/s in the red channel with a spectral resolution between 150[Formula: see text]km/s and 600[Formula: see text]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 field of view geometry and spectral calibration. The spectral calibration yields an accuracy of 15–60[Formula: see text]km/s depending on wavelength.

Publisher

World Scientific Pub Co Pte Lt

Subject

Astronomy and Astrophysics,Instrumentation

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