N ov 2 01 2 MMT and Magellan Infrared Spectrograph

The MMT and Magellan infrared spectrograph (MMIRS) is a cryogenic multiple slit spectrograph operating in the wavelength range 0.9-2.4 μm. MMIRS’ refractive optics offer a 6.9 by 6.9 field of view for imaging with a spatial resolution of 0.2 arcsec per pixel on a HAWAII-2 array. For spectroscopy, MMIRS can be used with long slits up to 6.9 long, or with custom slit masks having slitlets distributed over a 4 by 6.9 area. A range of dispersers offer spectral resolutions of 800 to 3000. MMIRS is designed to be used at the f/5 foci of the MMT or Magellan Clay 6.5m telescopes. MMIRS was commissioned in 2009 at the MMT and has been in routine operation at the Magellan Clay Telescope since 2010. MMIRS is being used for a wide range of scientific investigations from exoplanet atmospheres to Lyα emitters. Subject headings: techniques: spectroscopic, galaxies: absorption lines, galaxies: emission lines