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Herschel SPIRE FTS spectral mapping calibration

Benielli, Dominique and Polehampton, Edward and Hopwood, Rosalind and Griñón Marín, Ana Belén and Fulton, Trevor and Imhof, Peter and Lim, Tanya and Lu, Nanyao and Makiwa, Gibion and Marchili, Nicola and Naylor, David and Spencer, Locke and Swinyard, Bruce and Valtchanov, Ivan and van der Wiel, Matthijs (2014) Herschel SPIRE FTS spectral mapping calibration. Experimental Astronomy, 37 (2). pp. 357-367. ISSN 0922-6435. doi:10.1007/s10686-013-9367-9.

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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 pixel-by-pixel 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 continuum.

Item Type:Article
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URLURL TypeDescription Paper ReadCube access
Lu, Nanyao0000-0002-8948-1044
Valtchanov, Ivan0000-0001-9930-7886
Additional Information:© 2014 Springer Springer Science+Business Media Dordrecht. Received: 3 July 2013; Accepted: 9 December 2013; Published online: 15 January 2014. Herschel is an ESA space observatory with science instruments provided by European-led 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, UCL-MSSL, 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).
Funding AgencyGrant Number
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:SPIRE; FTS; Calibrationl Repeatability; Error
Issue or Number:2
Record Number:CaltechAUTHORS:20140829-084055342
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Official Citation:Benielli, D., Polehampton, E., Hopwood, R. et al. Exp Astron (2014) 37: 357. doi:10.1007/s10686-013-9367-9
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49048
Deposited By: Jason Perez
Deposited On:29 Aug 2014 20:09
Last Modified:10 Nov 2021 18:39

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