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Calibration of Herschel SPIRE FTS observations at different spectral resolutions

Marchili, N., Hopwood, R., Fulton, T., Polehampton, E. T., Valtchanov, I., Zaretski, J., Naylor, D. A., Griffin, Matthew Joseph, Imhof, P., Lim, T., Lu, N., Makiwa, G., Pearson, C. and Spencer, L. 2016. Calibration of Herschel SPIRE FTS observations at different spectral resolutions. Monthly Notices of the Royal Astronomical Society 464 (3) , pp. 3331-3342. 10.1093/mnras/stw2600

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The SPIRE Fourier Transform Spectrometer on-board the Herschel Space Observatory had two standard spectral resolution modes for science observations: high resolution (HR) and low resolution (LR), which could also be performed in sequence (H+LR). A comparison of the HR and LR resolution spectra taken in this sequential mode revealed a systematic discrepancy in the continuum level. Analysing the data at different stages during standard pipeline processing demonstrates that the telescope and instrument emission affect HR and H+LR observations in a systematically different way. The origin of this difference is found to lie in the variation of both the telescope and instrument response functions, while it is triggered by fast variation of the instrument temperatures. As it is not possible to trace the evolution of the response functions using housekeeping data from the instrument subsystems, the calibration cannot be corrected analytically. Therefore, an empirical correction for LR spectra has been developed, which removes the systematic noise introduced by the variation of the response functions.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: instrumentation: spectrographs –methods: data analysis – space vehicles: instruments – techniques: spectroscopic.
Publisher: Oxford University Press
ISSN: 0035-8711
Funders: UKSA
Date of First Compliant Deposit: 29 March 2017
Date of Acceptance: 7 October 2016
Last Modified: 04 Jun 2017 09:46

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