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Proceedings Paper

Integral field spectroscopy with the Gemini Near-Infrared Spectrograph
Author(s): Jeremy R. Allington-Smith; Cornelis M. Dubbeldam; Robert Content; Colin J. Dunlop; David J. Robertson; Jay Elias; Bernadette Rodgers; James E.H. Turner
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Paper Abstract

The Astronomical Instrumentation Group (AIG) of the University of Durham has recently completed an integral field unit (IFU) for use on the Gemini-South telescope with the Gemini Near-Infrared Spectrograph (GNIRS) built by the National Optical Astronomy Observatories (NOAO, USA). When the IFU is deployed remotely inside the instrument cryostat, GNIRS is converted into an integral field spectrograph with a field of 5 × 3 arcsec2 and spatial sampling of 0.15 × 0.15 arcsec2, optimised for 1-2.5μm but operable up to 5μm. We present summaries of the design and construction and results from laboratory testing. We also show results obtained at the telescope where a throughput of 90% was measured at 2.5μm, and show that this is consistent with predictions of a simple model where surface scattering is the dominant loss mechanism. The throughput data are well fit by the roughness measured in the laboratory. Finally, we show a few examples of astrophysical data from the commissioning run in April 2004.

Paper Details

Date Published: 30 September 2004
PDF: 10 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.551627
Show Author Affiliations
Jeremy R. Allington-Smith, Univ. of Durham (United Kingdom)
Cornelis M. Dubbeldam, Univ. of Durham (United Kingdom)
Robert Content, Univ. of Durham (United Kingdom)
Colin J. Dunlop, Univ. of Durham (United Kingdom)
David J. Robertson, Univ. of Durham (United Kingdom)
Jay Elias, National Optical Astronomy Observatory (United States)
Bernadette Rodgers, Gemini South Observatory (Chile)
James E.H. Turner, Gemini South Observatory (Chile)

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

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