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Astron. Astrophys. 315, L55-L59 (1996)

The photometric calibration of the ISO Short Wavelength Spectrometer*

S.G. Schaeidt1,2, P.W. Morris1,3, A. Salama1, B. Vandenbussche1,4, D.A. Beintema1,5, D.R. Boxhoorn1,5, H. Feuchtgruber1,2, A.M. Heras1, F. Lahuis1,5, K. Leech1, P.R. Roelfsema1,5, E.A. Valentijn1,5, O.H. Bauer2, N.S. van der Bliek7, M. Cohen10, Th. de Graauw5,8, L.N. Haser2, K.A. van der Hucht3, E. Huygen4, R.O. Katterloher2, M.F. Kessler1, J. Koornneef5, W. Luinge5, D. Lutz2, M. Planck2, H. Spoon2,3, C. Waelkens4, L.B.F.M. Waters6, E. Wieprecht2, K.J. Wildeman5, E. Young9, and P. Zaal6

1 ISO Science Operations Centre, Astrophysics Division of ESA, Postbox 50727, E-28080 Villafranca/Madrid, Spain
2 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstr. 1, D-85748 Garching, Germany
3 SRON, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
4 Instituut voor Sterrenkunde, University of Leuven, Celestijnenlaan 200B, B-3001 Heverlee Belgium
5 SRON, P.O. Box 800, 9700 AV Groningen, The Netherlands
6 Astronomical Institute Anton Pannekoek, University of Amsterdam, Kruislaan 403, 1098SJ Amsterdam, The Netherlands
7 Sterrewacht Leiden, Postbus 9513, 2300RA Leiden, The Netherlands
8 Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands
9 Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
10 Radio Astronomy Laboratory, University of California, Berkeley, California, CA 94720, USA

Received 1 August 1996 / Accepted 13 September 1996

Abstract. We give an overview of the photometric calibration of the Short Wavelength Spectrometer (SWS) through the Performance Verification phase. The basic strategy for deriving absolute flux densities from detector output for the grating and Fabry-Perot sections of SWS is reviewed, and the results are demonstrated with 2.4 - 45 img11.gifm spectra of representative standards img12.gif Dra, img13.gif Lyr, and img12.gif Cru. The effects of in-orbit changes in the relative spectral response function (RSRF) and ISO pointing are discussed. The systematic continuum flux level uncertainties (1 img14.gif ) are within the pre-launch specification of 30%. Further improvements depend on characterization of the in-orbit RSRF, improved performance of ISO pointing, and new data processing techniques.

Key words: instrumentation: spectrographs - methods: data analysis - infrared: general

* Based on observations made with the ISO, a project of ESA with the participation of ISAS and NASA, and the SWS, a joint project of SRON and MPE (DARA grants no 50 QI9402 3 and 50 QI 8610 8) with contributions from KU Leuven, Steward Observatory, and Phillips Laboratory.

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Last change: December 16, 1996
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