Share Email Print
cover

Proceedings Paper

SixPak: a wide-field IFU for the William Herschel Telescope
Author(s): Lars B. Venema; Ton Schoenmaker; Marc Verheijen; Scott Trager; René Rutten; Matthew Bershady; Søren Larsen; Reynier Peletier; Marco Spaans
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We intend to construct SixPak, a wide-field fibre-based IFU for the 4.2-meter William Herschel Telescope on La Palma. The fibre bundle will consist of 238 fibres, each 3.0 arcsec in diameter, piping light from the Nasmyth focal plane of the WHT to the existing WYFFOS bench spectrograph. A total of 217 fibres will be densely packed to span a hexagonal field of view of 64 × 55 arcsec. The remaining 21 fibres will collect light from the sky background. SixPak is optimized for 2-dimensional spectroscopy at intermediate resolutions of extended objects of low surface brightness. At Nasmyth focus, a focal reducer matches the f-ratio of the telescope (f/11) to the "optimal" f-ratio of the fibres (f/3) to reduce the losses due to focal ratio degradation in the fibres. Microlenses convert the output f-ratio of the fibres to the f-ratio of the WYFFOS collimator (f/8.2). By means of an exchangeable slit at the pupils of the microlenses, a spectral resolution of R = 10,000 can be achieved. The intention is that SixPak will be open for general use in order to allow easy access to the broadest possible astronomical community.

Paper Details

Date Published: 25 July 2008
PDF: 9 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70140L (25 July 2008); doi: 10.1117/12.789130
Show Author Affiliations
Lars B. Venema, ASTRON (Netherlands)
Ton Schoenmaker, ASTRON (Netherlands)
Marc Verheijen, Kapteyn Astronomical Institute, Univ. of Groningen (Netherlands)
Scott Trager, Kapteyn Astronomical Institute, Univ. of Groningen (Netherlands)
René Rutten, Isaac Newton Group of Telescopes (Spain)
Matthew Bershady, Univ. of Wisconsin, Madison (United States)
Søren Larsen, Astronomical Institute, Utrecht Univ. (Netherlands)
Reynier Peletier, Kapteyn Astronomical Institute, Univ. of Groningen (Netherlands)
Marco Spaans, Kapteyn Astronomical Institute, Univ. of Groningen (Netherlands)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

© SPIE. Terms of Use
Back to Top