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Proceedings Paper

MOSFIRE, the multi-object spectrometer for infra-red exploration at the Keck Observatory
Author(s): Ian S. McLean; Charles C. Steidel; Harland W. Epps; Nicholas Konidaris; Keith Y. Matthews; Sean Adkins; Theodore Aliado; George Brims; John M. Canfield; John L. Cromer; Jason Fucik; Kristin Kulas; Greg Mace; Ken Magnone; Hector Rodriguez; Gwen Rudie; Ryan Trainor; Eric Wang; Bob Weber; Jason Weiss
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Paper Abstract

This paper describes the as-built performance of MOSFIRE, the multi-object spectrometer and imager for the Cassegrain focus of the 10-m Keck 1 telescope. MOSFIRE provides near-infrared (0.97 to 2.41 μm) multi-object spectroscopy over a 6.1' x 6.1' field of view with a resolving power of R~3,500 for a 0.7" (0.508 mm) slit (2.9 pixels in the dispersion direction), or imaging over a field of view of ~6.9' diameter with ~0.18" per pixel sampling. A single diffraction grating can be set at two fixed angles, and order-sorting filters provide spectra that cover the K, H, J or Y bands by selecting 3rd, 4th, 5th or 6th order respectively. A folding flat following the field lens is equipped with piezo transducers to provide tip/tilt control for flexure compensation at the <0.1 pixel level. Instead of fabricated focal plane masks requiring frequent cryo-cycling of the instrument, MOSFIRE is equipped with a cryogenic Configurable Slit Unit (CSU) developed in collaboration with the Swiss Center for Electronics and Microtechnology (CSEM). Under remote control the CSU can form masks containing up to 46 slits with ~0.007-0.014" precision. Reconfiguration time is < 6 minutes. Slits are formed by moving opposable bars from both sides of the focal plane. An individual slit has a length of 7.0" but bar positions can be aligned to make longer slits in increments of 7.5". When masking bars are retracted from the field of view and the grating is changed to a mirror, MOSFIRE becomes a wide-field imager. The detector is a 2K x 2K H2-RG HgCdTe array from Teledyne Imaging Sensors with low dark current and low noise. Results from integration and commissioning are presented.

Paper Details

Date Published: 27 September 2012
PDF: 15 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84460J (27 September 2012); doi: 10.1117/12.924794
Show Author Affiliations
Ian S. McLean, Univ. of California, Los Angeles (United States)
Charles C. Steidel, California Institute of Technology (United States)
Harland W. Epps, Univ. of California, Santa Cruz (United States)
Nicholas Konidaris, California Institute of Technology (United States)
Keith Y. Matthews, California Institute of Technology (United States)
Sean Adkins, W. M. Keck Observatory (United States)
Theodore Aliado, Univ. of California, Los Angeles (United States)
George Brims, Univ. of California, Los Angeles (United States)
John M. Canfield, Univ. of California, Los Angeles (United States)
John L. Cromer, California Institute of Technology (United States)
Jason Fucik, California Institute of Technology (United States)
Kristin Kulas, Univ. of California, Los Angeles (United States)
Greg Mace, Univ. of California, Los Angeles (United States)
Ken Magnone, Univ. of California, Los Angeles (United States)
Hector Rodriguez, California Institute of Technology (United States)
Gwen Rudie, California Institute of Technology (United States)
Ryan Trainor, California Institute of Technology (United States)
Eric Wang, Univ. of California, Los Angeles (United States)
Bob Weber, California Institute of Technology (United States)
Jason Weiss, Univ. of California, Los Angeles (United States)


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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