23 July 2008 MOSFIRE: a multi-object near-infrared spectrograph and imager for the Keck Observatory
Author Affiliations +
Abstract
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ian S. McLean, Ian S. McLean, Charles C. Steidel, Charles C. Steidel, Keith Matthews, Keith Matthews, Harland Epps, Harland Epps, Sean M. Adkins, 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); doi: 10.1117/12.788142; https://doi.org/10.1117/12.788142
PROCEEDINGS
12 PAGES


SHARE
RELATED CONTENT

An ultraviolet imager to study bright UV sources
Proceedings of SPIE (July 18 2016)
Status of the EMIR optical system
Proceedings of SPIE (March 07 2003)
IRIS2: a working infrared multi-object spectrograph and camera
Proceedings of SPIE (September 30 2004)
ABEL a near IR grism spectrometer and camera for...
Proceedings of SPIE (August 21 1998)
Omega Cass a new multimode NIR imager spectrometer for...
Proceedings of SPIE (August 21 1998)

Back to Top