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Systematic characterization of the Herschel SPIRE Fourier Transform Spectrometer

Hopwood, R. and Polehampton, E. T. and Valtchanov, I. and Swinyard, B. M. and Fulton, T. and Lu, N. and Marchili, N. and van der Wiel, M. H. D. and Benielli, D. and Imhof, P. and Baluteau, J.-P. and Pearson, C. and Clements, D. L. and Griffin, M. J. and Lim, T. L. and Makiwa, G. and Naylor, D. A. and Noble, G. and Puga, E. and Spencer, L. D. (2015) Systematic characterization of the Herschel SPIRE Fourier Transform Spectrometer. Monthly Notices of the Royal Astronomical Society, 449 (3). pp. 2274-2303. ISSN 0035-8711.

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A systematic programme of calibration observations was carried out to monitor the performance of the Spectral and Photometric Imaging REceiver (SPIRE) Fourier Transform Spectrometer (FTS) instrument on board the Herschel Space Observatory. Observations of planets (including the prime point-source calibrator, Uranus), asteroids, line sources, dark sky and cross-calibration sources were made in order to monitor repeatability and sensitivity, and to improve FTS calibration. We present a complete analysis of the full set of calibration observations and use them to assess the performance of the FTS. Particular care is taken to understand and separate out the effect of pointing uncertainties, including the position of the internal beam steering mirror for sparse observations in the early part of the mission. The repeatability of spectral-line centre positions is <5 km s^(−1), for lines with signal-to-noise ratios >40, corresponding to <0.5–2.0 per cent of a resolution element. For spectral-line flux, the repeatability is better than 6 per cent, which improves to 1–2 per cent for spectra corrected for pointing offsets. The continuum repeatability is 4.4 per cent for the SPIRE Long Wavelength spectrometer (SLW) band and 13.6 per cent for the SPIRE Short Wavelength spectrometer (SSW) band, which reduces to ∼1 per cent once the data have been corrected for pointing offsets. Observations of dark sky were used to assess the sensitivity and the systematic offset in the continuum, both of which were found to be consistent across the FTS-detector arrays. The average point-source calibrated sensitivity for the centre detectors is 0.20 and 0.21 Jy [1σ; 1 h], for SLW and SSW. The average continuum offset is 0.40 Jy for the SLW band and 0.28 Jy for the SSW band.

Item Type:Article
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URLURL TypeDescription ItemSupporting Information
Valtchanov, I.0000-0001-9930-7886
Lu, N.0000-0002-8948-1044
Pearson, C.0000-0001-6139-649X
Clements, D. L.0000-0002-9548-5033
Additional Information:© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 February 17. Received 2015 February 17; in original form 2014 December 15. First published online March 31, 2015. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. We thank the referee, J. P. Maillard, for his constructive comments, which helped improve the paper. SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including: University Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, University Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, University Sussex (UK); and Caltech, JPL, NHSC, University 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, UKSA (UK); and NASA (USA). This research is supported in part by the Canadian Space Agency (CSA) and the Natural Sciences and Engineering Research Council of Canada (NSERC). This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
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 Economía y Competitividad (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Subject Keywords: instrumentation: spectrographs methods: data analysis space vehicles: instruments
Issue or Number:3
Record Number:CaltechAUTHORS:20150626-093428419
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Official Citation:R. Hopwood, E. T. Polehampton, I. Valtchanov, B. M. Swinyard, T. Fulton, N. Lu, N. Marchili, M. H. D. van der Wiel, D. Benielli, P. Imhof, J.-P. Baluteau, C. Pearson, D. L. Clements, M. J. Griffin, T. L. Lim, G. Makiwa, D. A. Naylor, G. Noble, E. Puga, and L. D. Spencer Systematic characterization of the Herschel SPIRE Fourier Transform Spectrometer MNRAS (May 21, 2015) Vol. 449 2274-2303 doi:10.1093/mnras/stv353 First published online March 31, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58632
Deposited By: Ruth Sustaita
Deposited On:26 Jun 2015 17:33
Last Modified:03 Oct 2019 08:38

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