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Proceedings Paper

The AAO's Gemini High-Resolution Optical SpecTrograph (GHOST) concept
Author(s): Michael J. Ireland; Stuart Barnes; David Cochrane; Matthew Colless; Peter Connor; Anthony Horton; Steve Gibson; Jon Lawrence; Sarah Martell; Peter McGregor; Tom Nicolle; Kathryn Nield; David Orr; J. Gordon Robertson; Stuart Ryder; Andrew Sheinis; Greg Smith; Nick Staszak; Julia Tims; Pascal Xavier; Peter Young; Jessica Zheng
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Paper Abstract

The Gemini High-Resolution Optical SpecTrograph (GHOST) will fill an important gap in the current suite of Gemini instruments. We will describe the Australian Astronomical Observatory (AAO)-led concept for GHOST, which consists of a multi-object, compact, high-efficiency, fixed-format, fiber-fed design. The spectrograph itself is a four-arm variant of the asymmetric white-pupil echelle Kiwispec spectrograph, Kiwisped, produced by Industrial Research Ltd. This spectrograph has an R4 grating and a 100mm pupil, and separate cross-disperser and camera optics for each of the four arms, carefully optimized for their respective wavelength ranges. We feed this spectrograph with a miniature lensletbased IFU that sub-samples the seeing disk of a single object into 7 hexagonal sub-images, reformatting this into a slit with a second set of double microlenses at the spectrograph entrance with relatively little loss due to focal-ratio degradation. This reformatting enables high spectral resolution from a compact design that fits well within the relatively tight GHOST budget. We will describe our baseline 2-object R~50,000 design with full wavelength coverage from the ultraviolet to the silicon cutoff, as well as the high-resolution single-object R~75,000 mode.

Paper Details

Date Published: 24 September 2012
PDF: 13 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844629 (24 September 2012); doi: 10.1117/12.925746
Show Author Affiliations
Michael J. Ireland, Australian Astronomical Observatory (Australia)
Macquarie Univ. (Australia)
Stuart Barnes, Stuart Barnes Optical Design (New Zealand)
David Cochrane, Industrial Research Ltd. (New Zealand)
Matthew Colless, Australian Astronomical Observatory (Australia)
Peter Connor, Industrial Research Ltd. (New Zealand)
Anthony Horton, Australian Astronomical Observatory (Australia)
Steve Gibson, Industrial Research Ltd. (New Zealand)
Jon Lawrence, Australian Astronomical Observatory (Australia)
Sarah Martell, Australian Astronomical Observatory (Australia)
Peter McGregor, The Australian National Univ. (Australia)
Tom Nicolle, Industrial Research Ltd. (New Zealand)
Kathryn Nield, Industrial Research Ltd. (New Zealand)
David Orr, Australian Astronomical Observatory (Australia)
J. Gordon Robertson, Australian Astronomical Observatory (Australia)
Sydney Institute for Astronomy, The Univ. of Sydney (Australia)
Stuart Ryder, Australian Astronomical Observatory (Australia)
Andrew Sheinis, Australian Astronomical Observatory (Australia)
Greg Smith, Australian Astronomical Observatory (Australia)
Nick Staszak, Australian Astronomical Observatory (Australia)
Julia Tims, Australian Astronomical Observatory (Australia)
Pascal Xavier, Australian Astronomical Observatory (Australia)
Peter Young, The Australian National Univ. (Australia)
Jessica Zheng, Australian Astronomical Observatory (Australia)

Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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