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Herschel SPIRE FTS spectral mapping calibration

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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 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.

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Acknowledgments

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).

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Authors and Affiliations

  1. Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388, Marseille, France

    Dominique Benielli

  2. RAL Space, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK

    Edward Polehampton, Ana Belén Griñón Marín, Tanya Lim & Bruce Swinyard

  3. Institute for Space Imaging Science, Department of Physics and Astronomy, University of Lethbridge, Lethbridge, AB, T1K3M4, Canada

    Edward Polehampton, Trevor Fulton, Peter Imhof, Gibion Makiwa, David Naylor, Locke Spencer & Matthijs van der Wiel

  4. Physics Department, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK

    Rosalind Hopwood

  5. Bluesky Spectroscopy, Lethbridge, AB, T1J 0N9, Canada

    Trevor Fulton & Peter Imhof

  6. NHSC/IPAC, 100-22 Caltech, Pasadena, CA, 91125, USA

    Nanyao Lu

  7. Dipartimento di Fisica e Astronomia, Università di Padova, 35131, Padova, Italy

    Nicola Marchili

  8. Herschel Science Centre, ESAC, P.O. Box 78, 28691, Villanueva de la Cañada, Madrid, Spain

    Ivan Valtchanov

Authors
  1. Dominique Benielli
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  2. Edward Polehampton
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  3. Rosalind Hopwood
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  4. Ana Belén Griñón Marín
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  5. Trevor Fulton
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  6. Peter Imhof
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  7. Tanya Lim
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  8. Nanyao Lu
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  9. Gibion Makiwa
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  10. Nicola Marchili
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  11. David Naylor
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  12. Locke Spencer
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  13. Bruce Swinyard
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  14. Ivan Valtchanov
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  15. Matthijs van der Wiel
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Corresponding author

Correspondence to Dominique Benielli.

Additional information

Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

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Benielli, D., Polehampton, E., Hopwood, R. et al. Herschel SPIRE FTS spectral mapping calibration. Exp Astron 37, 357–367 (2014). https://doi.org/10.1007/s10686-013-9367-9

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  • DOI: https://doi.org/10.1007/s10686-013-9367-9

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