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Flux calibration of the Herschel-SPIRE photometer

Bendo, G. J. and Griffin, M. J. and Bock, J. J. and Conversi, L. and Dowell, C. D. and Lim, T. and Lu, N. and North, C. E. and Papageorgiou, A. and Pearson, C. P. and Pohlen, M. and Polehampton, E. T. and Schulz, B. and Shupe, D. L. and Sibthorpe, B. and Spencer, L. D. and Swinyard, B. M. and Valtchanov, I. and Xu, C. K. (2013) Flux calibration of the Herschel-SPIRE photometer. Monthly Notices of the Royal Astronomical Society, 433 (4). pp. 3062-3078. ISSN 0035-8711. doi:10.1093/mnras/stt948.

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We describe the procedure used to flux calibrate the three-band submillimetre photometer in the Spectral and Photometric Imaging Receiver instrument on the Herschel Space Observatory. This includes the equations describing the calibration scheme, a justification for using Neptune as the primary calibration source, a description of the observations and data processing procedures used to derive flux calibration parameters (for converting from voltage to flux density) for every bolometer in each array, an analysis of the error budget in the flux calibration for the individual bolometers and tests of the flux calibration on observations of primary and secondary calibrators. The procedure for deriving the flux calibration parameters is divided into two parts. In the first part, we use observations of astronomical sources in conjunction with the operation of the photometer internal calibration source to derive the unscaled derivatives of the flux calibration curves. To scale the calibration curves in Jy beam^(−1) V^(−1), we then use observations of Neptune in which the beam of each bolometer is mapped using a very fine scan pattern. The total instrumental uncertainties in the flux calibration for most individual bolometers is ∼0.5  per cent, although a few bolometers have uncertainties of ∼1–5  per cent because of issues with the Neptune observations. Based on application of the flux calibration parameters to Neptune observations performed using typical scan map observing modes, we determined that measurements from each array as a whole have instrumental uncertainties of 1.5  per cent. This is considerably less than the absolute calibration uncertainty associated with the model of Neptune, which is estimated at 4  per cent.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper DOIArticle
Bock, J. J.0000-0002-5710-5212
Lu, N.0000-0002-8948-1044
Papageorgiou, A.0000-0002-3039-9257
Pearson, C. P.0000-0001-6139-649X
Shupe, D. L.0000-0003-4401-0430
Valtchanov, I.0000-0001-9930-7886
Xu, C. K.0000-0002-1588-6700
Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 May 29. Received 2013 May 29; in original form 2013 April 30. First published online: July 5, 2013. Herschel is a European Space Agency (ESA) space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. We thank the reviewer for the helpful comments on this paper. SPIRE has been developed by a consortium of institutes led by Cardiff Univ. (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, UKSA (UK) and NASA (USA). HIPE is a joint development by the Herschel Science Ground Segment Consortium, consisting of ESA, the NASA Herschel Science Center and the HIFI, PACS and SPIRE consortia.
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:instrumentation: photometers
Issue or Number:4
Record Number:CaltechAUTHORS:20130904-083919768
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41074
Deposited By: Tony Diaz
Deposited On:18 Sep 2013 17:25
Last Modified:10 Nov 2021 04:25

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