Journal Title
Title of Journal: Exp Astron
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Abbravation: Experimental Astronomy
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Publisher
Springer Netherlands
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Authors: Dominique Benielli Edward Polehampton Rosalind Hopwood Ana Belén Griñón Marín Trevor Fulton Peter Imhof Tanya Lim Nanyao Lu Gibion Makiwa Nicola Marchili David Naylor Locke Spencer Bruce Swinyard Ivan Valtchanov Matthijs van der Wiel
Publish Date: 2014/01/15
Volume: 37, Issue: 2, Pages: 357-367
Abstract
The Herschel SPIRE Fourier transform spectrometer FTS performs spectral imaging in the 447–1546 GHz band It can observe in three spatial sampling modes sparse mode with a single pointing on sky or intermediate or full modes with 1 and 1/2 beam spacing respectively In this paper we investigate the uncertainty and repeatability for fully sampled FTS mapping observations The repeatability is characterised using nine observations of the Orion Bar Metrics are derived based on the ratio of the measured intensity in each observation compared to that in the combined spectral cube from all observations The mean relative deviation is determined to be within 2 and the pixelbypixel scatter is ∼ 7 The scatter increases towards the edges of the maps The uncertainty in the frequency scale is also studied and the spread in the line centre velocity across the maps is found to be ∼ 15 km s − 1 Other causes of uncertainty are also discussed including the effect of pointing and the additive uncertainty in the continuumHerschel is an ESA space observatory with science instruments provided by Europeanled Principal Investigator consortia and with important participation from NASA SPIRE has been developed by a consortium of institutes led by Cardiff University UK and including Univ Lethbridge Canada NAOC China CEA LAM France IFSI Univ Padua Italy IAC Spain Stockholm Observatory Sweden Imperial College London RAL UCLMSSL UKATC Univ Sussex UK and Caltech JPL NHSC Univ Colorado USA This development has been supported by national funding agencies CSA Canada NAOC China CEA CNES CNRS France ASI Italy MCINN Spain SNSB Sweden STFC UK and NASA USA
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