Astronomical imaging Fourier spectroscopy at far-infrared wavelengths
David A. Naylor (1), Brad G. Gom (1), Matthijs H.D. van der Wiel (1),, Gibion Makiwa (1) ((1) Institute for Space Imaging Science, U of Lethbridge,, AB, Canada)
TL;DR
This paper reviews the principles, designs, and applications of astronomical imaging Fourier transform spectroscopy at far-infrared wavelengths, highlighting the Mach-Zehnder interferometer and data analysis techniques.
Contribution
It provides a comprehensive overview of the Mach-Zehnder design and demonstrates its application in astrophysical parameter retrieval using Herschel SPIRE data.
Findings
Comparison of interferometer formats for FTS
Examples of three Mach-Zehnder-based instruments
Successful retrieval of astrophysical parameters from Herschel data
Abstract
The principles and practice of astronomical imaging Fourier transform spectroscopy (FTS) at far-infrared wavelengths are described. The Mach-Zehnder interferometer design has been widely adopted for current and future imaging FTS instruments; we compare this design with two other common interferometer formats. Examples of three instruments based on the Mach-Zehnder design are presented. The techniques for retrieving astrophysical parameters from the measured spectra are discussed using calibration data obtained with the Herschel SPIRE instrument. The paper concludes with an example of imaging spectroscopy obtained with the SPIRE FTS instrument.
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