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MOSFIRE cross section
newsletter article

MOSFIRE is a NIR multi-object spectrograph with a field of view of 6.1' x 6.1' and is capable of acquiring spectra in one of four atmospheric bands at a time: Y(0.97-1.12μm), J(1.15-1.35μm), H (1.46-1.81μm), or K(1.93-2.45μm). Up to 46 slits may be deployed using a unique cryogenic robotic slit mask system that is reconfigurable electronically in < 5 minutes. Using a single state-of-the-art Teledyne Hawaii 2RG HgCdTe detector with 2K x 2K pixels, MOSFIRE will capture most or all of an atmospheric window in a single exposure for any slit placed within a 6' x 3' field. The instrument employs a single, fixed diffraction grating used in multiple orders (3, 4, 5, and 6) for dispersion in the K, H, J and Y (a.k.a. Z) bands, respectively. MOSFIRE is designed to be located at the Cassegrain focus of the Keck I telescope where it will provide faint object imaging and spectroscopic capabilities entirely complementary to the dual-beamed optical (0.3-1 micron) spectrograph, LRIS.

MOSFIRE field configuration

The above image shows the field of view configuration for MOSFIRE. The Blue circle (6.8 arcmin diameter) represents the 6.8 diameter collimator field of view. The red square (6.12 x 6.12 arcmin) is the detector area. The intersection of the red and blue geometries is the imaging field of view. The green rectangle is the "nominal" spectroscopic field, over which none of the slits would be vignetted. The mask design software has nice tools that will indicate the wavelength coverage for every slit, with the ability to mark a particular wavelengths of interest.