Herschel SPIRE FTS relative spectral response calibration

Fulton, Trevor, Hopwood, Rosalind, Baluteau, Jean-Paul, Benielli, Dominique, Imhof, Peter, Lim, Tanya, Lu, Nanyao, Marchili, Nicola, Naylor, David, Polehampton, Edward, Swinyard, Bruce and Valtchanov, Ivan 2014. Herschel SPIRE FTS relative spectral response calibration. Experimental Astronomy 37 (2) , pp. 381-395. 10.1007/s10686-013-9364-z

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Abstract

Herschel/SPIRE Fourier transform spectrometer (FTS) observations contain emission from both the Herschel Telescope and the SPIRE Instrument itself, both of which are typically orders of magnitude greater than the emission from the astronomical source, and must be removed in order to recover the source spectrum. The effects of the Herschel Telescope and the SPIRE Instrument are removed during data reduction using relative spectral response calibration curves and emission models. We present the evolution of the methods used to derive the relative spectral response calibration curves for the SPIRE FTS. The relationship between the calibration curves and the ultimate sensitivity of calibrated SPIRE FTS data is discussed and the results from the derivation methods are compared. These comparisons show that the latest derivation methods result in calibration curves that impart a factor of between 2 and 100 less noise to the overall error budget, which results in calibrated spectra for individual observations whose noise is reduced by a factor of 2–3, with a gain in the overall spectral sensitivity of 23 % and 21 % for the two detector bands, respectively.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Springer
ISSN:	0922-6435
Funders:	UKSA/STFC
Date of Acceptance:	7 November 2013
Last Modified:	20 Feb 2019 13:02
URI:	https://orca.cardiff.ac.uk/id/eprint/67157

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