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Proceedings Paper

WiFeS: the wide field spectrograph
Author(s): Michael A. Dopita; Liam E. Waldron; Peter McGregor; Peter Conroy; Matthew C. Doolan; Ross Zhelem; Gabe Bloxham; Will Saunders; Damien Jones; Lee Pfitzner
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Paper Abstract

WiFeS is a powerful integral field, double-beam, concentric, image-slicing spectrograph designed to deliver excellent thoughput, precision spectrophotometric performance and superb image quality along with wide spectral coverage throughout the 320-1000 nm wavelength region. It is currently under construction at the Research School of Astronomy and Astrophysics of the Australian National University (ANU), and will be mounted on the ANU 2.3m telescope at Siding Spring Observatory. It will provide a 25x31 arc sec field with 0.5 arc sec sampling along each of twenty five 31x1.0 arc sec slitlets. The output format is arranged to match the 4096x4096 pixel CCD detectors in each of two cameras individually optimized for the blue and the red ends of the spectrum, respectively. A process of "interleaved nod-and-shuffle" will be applied to permit quantum noise-limited sky subtraction. Using VPH gratings, spectral resolutions modes of 3000 and 7000 will be provided. The full spectral range is covered in a single exposure in the R=3000 mode, and in two exposures in the R=7000 mode. The use of transmissive coated optics, VPH gratings and optimized mirror coatings ensures a throughput (including telescope and atmosphere) that peaks above 30%. The concentric image-slicer design ensures an excellent and uniform image quality across the full field. To maximize the scientific return, the whole instrument is configured for remote observing, pipeline data reduction, and the accumulation of calibration image libraries.

Paper Details

Date Published: 30 September 2004
PDF: 9 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.541264
Show Author Affiliations
Michael A. Dopita, The Australian National Univ. (Australia)
Liam E. Waldron, The Australian National Univ. (Australia)
Peter McGregor, The Australian National Univ. (Australia)
Peter Conroy, The Australian National Univ. (Australia)
Matthew C. Doolan, The Australian National Univ. (Australia)
Ross Zhelem, The Australian National Univ. (Australia)
Gabe Bloxham, The Australian National Univ. (Australia)
Will Saunders, Anglo-Australian Observatory (Australia)
Damien Jones, Prime Optics (Australia)
Lee Pfitzner, Auspace Ltd. (Australia)


Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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