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 lenslet-based 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.
Original language | English |
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Title of host publication | Ground-Based and Airborne Instrumentation for Astronomy IV |
Subtitle of host publication | Proceedings of SPIE Vol. 8446 |
Editors | Ian S. McLean, Suzanne K. Ramsay, Hideki Takami |
Place of Publication | Bellingham, Washington |
Publisher | SPIE |
Pages | 1-13 |
Number of pages | 13 |
Volume | 8446 |
ISBN (Print) | 9780819491473 |
DOIs | |
Publication status | Published - 2012 |
Event | Ground-Based and Airborne Instrumentation for Astronomy IV - Amsterdam, Netherlands Duration: 1 Jul 2012 → 6 Jul 2012 |
Other
Other | Ground-Based and Airborne Instrumentation for Astronomy IV |
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Country/Territory | Netherlands |
City | Amsterdam |
Period | 1/07/12 → 6/07/12 |