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Astron. Astrophys. 315, L43-L48 (1996)

Calibration and performance of the ISO Long-Wavelength Spectrometer

B.M. Swinyard1, P.E. Clegg2, P.A.R. Ade2, C. Armand3, J.-P. Baluteau4, M.J. Barlow5, J.-C. Berges6, M. Burgdorf3, E. Caux7, C. Ceccarelli8, R. Cerulli8, S.E. Church9, S. Colgan10, F. Cotin7, P. Cox11, P. Cruvellier6, G.R. Davis12, A. DiGiorgio3, R.J. Emery1, D. Ewart3, J. Fischer13, I. Furniss5, W.M. Glencrossi5, M. Greenhouse14, M.J. Griffin2, C. Gry3,6, M.R. Haas10, M. Joubert15, K.J. King1, T. Lim3, R. Liseau16, S. Lord17, D. Lorenzetti18, S. Molinari3, D.A. Naylor19, B. Nisini8, A. Omont20, R. Orfei8, T. Patrick21, D. Pequignot22, D. Pouliquen6, M.C. Price3, Nguyen-Q-Rieu23, F.D. Robinson24, M. Saisse6, P. Saraceno8, G. Serra7, S.D. Sidher3, H.A. Smith14, L. Spinoglio8, D. Texier3, W.A. Towlson5, N. Trams3, S.J. Unger1, and G.J. White2

1 Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK
2 Queen Mary and Westfield College, University of London, Mile End Road, London E1 4NS, UK
3 The LWS Instrument-Dedicated Team, ISO Science Operations Centre, Villafranca, Spain
4 Observatoire de Marseille, 2 place de Verrier, F-13248 Marseille, France
5 Dept. of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
6 Laboratoire d'Astronomie Spatiale, BP 8, Les Trois Lucs, F-13376 Marseille, France
7 Centre d'Etude Spatiale des Rayonnements, 9, avenue de Colonel Roche, F-31029 Toulouse, France
8 CNR-Istituto de Fisica dello Spazio Interplanetario, CP 27, I-00044 Frascati, Italy
9 Observational Cosmology, MC 59-33, California Institute of Technology, Pasadena, CA 91125, USA
10 Nasa Ames Reaserch Center, ms 245-6 Astrophysics Branch, Space Science Division, Moffet Field, CA 94035 1000, USA
11 Universitie de Paris XI, Batiment 121, F-91405 Orsay, France
12 Institute of Space and Atmospheric Studies, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, S7N 5E2, Canada
13 Naval Research Laboratory, Remote Sensing Division, 4555 Overlook Avenue SW, Washington DC 20375, USA
14 National Air and Space Museum, Smithsonian Institution, Laboratory for Astrophysics, Washington, DC 20560, USA
15 CNES, 2 pace Maurice Quentin, F-75001 Paris, France
16 Stockholm Observatory, S-13336, Saltsjobaden, Sweden
17 IPAC/Caltech, ms 100-22, Pasadena, CA 91125, USA
18 Osservatorio Astronomico di Roma, I-00040 Monte Porzio, Italy
19 Department of Physics, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta, T1K 3M4, Canada
20 Institut d'Astrophysique, 98bis boulevard Arago, F-75014 Paris, France
21 Mullard Space Science Laboratory, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK
22 Observatoire de Paris, Section d'Astrophysique, F-92190 Paris, France
23 Observatoire de Paris, 61 avenue de l'Observatoire, F-75014 Paris, France
24 Code 717.3, NASA Goddard SFC, Greenbelt, MD 20771, USA

Received 5 August 1996 / Accepted 22 August 1996

Abstract. The wavelength and flux calibration, and the in-orbit performance of the Infrared Space Observatory Long-Wavelength Spectrometer (LWS) are described. The LWS calibration is mostly complete and the instrument's performance in orbit is largely as expected before launch. The effects of ionising radiation on the detectors, and the techniques used to minimise them are outlined. The overall sensitivity figures achieved in practice are summarised. The standard processing of LWS data is described.

Key words: artificial satellites - instrumentation: spectrographs - infrared: general

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