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MOSFIRE: a multi-object near-infrared spectrograph and imager for the Keck Observatory

McLean, Ian S. and Steidel, Charles C. and Matthews, Keith and Epps, Harland and Adkins, Sean M. (2008) MOSFIRE: a multi-object near-infrared spectrograph and imager for the Keck Observatory. In: Ground-based and Airborne Instrumentation for Astronomy II. Proceedings of SPIE. No.7014. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 70142Z. ISBN 9780819472243.

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MOSFIRE, the multi-object spectrometer for infra-red exploration, is a near-IR (0.97-2.45 micron) spectrograph and imager for the Cassegrain focus of the Keck I telescope. The optical design provides imaging and multi-object spectroscopy over a field of view (FOV) of 6.14' x 6.14' with a resolving power of R~3,270 for a slit width of 0.7 arc seconds (2.9 pixels along dispersion). The detector is a 2.5 micron cut-off 2K x 2K H2-RG HgCdTe array with a SIDECAR ASIC for detector control. A special feature of MOSFIRE is that its multiplex advantage of up to 46 slits is achieved using a cryogenic Configurable Slit Unit (developed in collaboration with the Swiss Centre for Electronics and Micro Technology) reconfigurable under remote control in <5 minutes without thermal cycling. Slits are formed by moving opposable bars from both sides of the focal plane. An individual slit has a length of ~7.1 arc seconds but bar positions can be aligned to make longer slits. A single diffraction grating in two positions along with order-sorting filters gives essentially full coverage of the K, H, J and Y bands using 3rd, 4th, 5th or 6th order respectively. The grating and a mirror are mounted back-to-back, and when the bars are retracted from the FOV MOSFIRE becomes a wide-field imager. A piezo tip-tilt mirror following the field lens is used to provide flexure compensation at the 0.1 pixel level. Two large CCR heads allow the instrument to reach operating temperature in ~7 days. MOSFIRE is currently in construction.

Item Type:Book Section
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Steidel, Charles C.0000-0002-4834-7260
Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). It is a pleasure to thank all the members of the MOSFIRE team and our sub-contractors, as well as the members of our review boards for their many contributions and support. This material is based on work funded by the generous financial support of Gordon and Betty Moore and supported by AURA through the National Science Foundation under AURA Cooperative Agreement AST 0132798, as amended. This work was performed for the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:Instrumentation, infrared, spectrograph, multi-object
Series Name:Proceedings of SPIE
Issue or Number:7014
Record Number:CaltechAUTHORS:20190712-140140407
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Official Citation:Ian S. McLean, Charles C. Steidel, Keith Matthews, Harland Epps, and Sean M. Adkins "MOSFIRE: a multi-object near-infrared spectrograph and imager for the Keck Observatory", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70142Z (23 July 2008);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97134
Deposited By: Tony Diaz
Deposited On:12 Jul 2019 21:11
Last Modified:16 Nov 2021 17:27

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