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Herschel SPIRE FTS telescope model correction

Hopwood, Rosalind and Fulton, Trevor and Polehampton, Edward T. and Valtchanov, Ivan and Benielli, Dominique and Imhof, Peter and Lim, Tanya and Lu, Nanyao and Marchili, Nicola and Pearson, Chris P. and Swinyard, Bruce M. (2014) Herschel SPIRE FTS telescope model correction. Experimental Astronomy, 37 (2). pp. 195-205. ISSN 0922-6435. https://resolver.caltech.edu/CaltechAUTHORS:20140829-084007888

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Abstract

Emission from the Herschel telescope is the dominant source of radiation for the majority of SPIRE Fourier transform spectrometer (FTS) observations, despite the exceptionally low emissivity of the primary and secondary mirrors. Accurate modelling and removal of the telescope contribution is, therefore, an important and challenging aspect of FTS calibration and data reduction pipeline. A dust-contaminated telescope model with time invariant mirror emissivity was adopted before the Herschel launch. However, measured FTS spectra show a clear evolution of the telescope contribution over the mission and strong need for a correction to the standard telescope model in order to reduce residual background (of up to 7 Jy) in the final data products. Systematic changes in observations of dark sky, taken over the course of the mission, provide a measure of the evolution between observed telescope emission and the telescope model. These dark sky observations have been used to derive a time dependent correction to the telescope emissivity that reduces the systematic error in the continuum of the final FTS spectra to ∼0.35 Jy.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s10686-013-9355-0DOIArticle
http://link.springer.com/article/10.1007%2Fs10686-013-9355-0PublisherArticle
http://arxiv.org/abs/1401.2047arXivDiscussion Paper
http://rdcu.be/twf5PublisherFree ReadCube access
ORCID:
AuthorORCID
Valtchanov, Ivan0000-0001-9930-7886
Lu, Nanyao0000-0002-8948-1044
Pearson, Chris P.0000-0001-6139-649X
Additional Information:© 2013 Springer Science+Business Media Dordrecht. Received: 30 June 2013; Accepted: 22 September 2013; Published online: 12 October 2013. 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).
Funders:
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
NASAUNSPECIFIED
Subject Keywords:SPIRE; FTS; Calibration; Spectroscopy; Herschel observatory
Issue or Number:2
Record Number:CaltechAUTHORS:20140829-084007888
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140829-084007888
Official Citation:Hopwood, R., Fulton, T., Polehampton, E.T. et al. Exp Astron (2014) 37: 195. doi:10.1007/s10686-013-9355-0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49047
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:29 Aug 2014 19:45
Last Modified:03 Oct 2019 07:10

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