Next generation low resolution Wide Field Multi-Object Optical Spectrometer for W.M. Keck Observatory

Jason Fucik; Charles Steidel; Bradford Holden; Richard Dekany; Lauren Fahey; Jocelyn Ferrara; Steven R. Gibson; Timothee Greffe; Marc Kassis; Larry Lingvay; Reston Nash; Rishi Pahuja; Roger Smith; Bob Weber; Jake Zimmer

doi:10.1117/12.3020284

18 July 2024 Next generation low resolution Wide Field Multi-Object Optical Spectrometer for W.M. Keck Observatory

Jason Fucik, Charles Steidel, Bradford Holden, Richard Dekany, Lauren Fahey, Jocelyn Ferrara, Steven R. Gibson, Timothee Greffe, Marc Kassis, Larry Lingvay, Reston Nash, Rishi Pahuja, Roger Smith, Bob Weber, Jake Zimmer

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130968Z (2024) https://doi.org/10.1117/12.3020284
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We present a concept design for a next generation low resolution, wide-field, optical imaging spectrometer intended to continue the legacy of LRIS as the premier workhorse optical spectrometer on the Keck I telescope, which we notionally call LRIS-2. The original LRIS continues to be used an average of more than 100 nights per year while maintaining a remarkably high publication rate, neither of which shows any signs of diminishing with time. Nevertheless, LRIS was commissioned ∼30 years ago, and its opto-mechanical design and aging mechanisms preclude further improvements in its stability and reliability. This paper presents the conceptual design of a state-of-the-art instrument combining the core capabilities and scientific versatility of LRIS with substantial improvements in throughput, image quality, stability, and on-sky efficiency. In this paper, we present a concept for a versatile imaging spectrometer with an on-axis field of view of 10′×5′ in two simultaneous wavelength channels that together cover 3100 – 10,300Å at R∼1500 in a single exposure, with a multiplex factor of 70. The optical design delivers total spectroscopic throughput close to 60%, a gain over the current LRIS of 30-100%. The design is able to benefit from significant engineering heritage from LRIS-B, KCWI, KCRM, and TMT-WFOS projects.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Jason Fucik, Charles Steidel, Bradford Holden, Richard Dekany, Lauren Fahey, Jocelyn Ferrara, Steven R. Gibson, Timothee Greffe, Marc Kassis, Larry Lingvay, Reston Nash, Rishi Pahuja, Roger Smith, Bob Weber, and Jake Zimmer "Next generation low resolution Wide Field Multi-Object Optical Spectrometer for W.M. Keck Observatory", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130968Z (18 July 2024); https://doi.org/10.1117/12.3020284

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