1. MMT Magellan Infrared Spectrograph ( MMIRS ) P.I. Brian McLeod Warren R. Brown SAO/CfA

2. Science Drivers – Star formation at high redshift (Erb 2006)

3. Science Drivers – Brown dwarfs

4. Slit Mask Detector (Image from Flamingos) Multi-Slit Spectrograph

5. Basic Operational Modes Imaging 6.9 x 6.9 arcminute FOV 0.202 arcsecond pixels Y, J, H, K s wavelength coverage Spectroscopy Multi-slit (4′x7′) or longslit (7′) – J, H, K @ R=3500 – H+K @ R=1300

6. TRUSS ELECTRONICS RACKS (2) GUIDER/ WFS MOS SECTION DETECTOR PRE-AMP’S OPTICS + DETECTOR SECTION TELESCOPE TRUSS ASSEMBLY WITH BOLT INTERFACES TO TELESCOPE & CRYOSTAT ELECTRONICS RACK TRUSS (2) SLITMASK SECTION MMIRS EXTERIOR

7. MMIRS INTERIOR Corrector Optics (warm) Guider/WFS (warm) Detector LN2 Tank/ Optical Bench Collimator Camera Slit Masks Dekker Filter and Grism Wheels

9. MMIRS OPTICS

10. MMIRS Field of View Guide camera patrol area Imaging field D = 14 arcmin A = 50 arcmin 2 ea 7x7 arcmin Guider FOV 80” Slit masks 4x7 arcmin, central 2′x7 ′ with full wavelength coverage

11. Detector Information HAWAII-2 2k x 2k HgCdTe detector Full well 230,000 e - Readnoise 16 e - (per pair of reads) Dark current 0.05 e-/s/pix at 83 K (temp dependent) Readout: 32 channels at 180 kHz = 0.7 sec CMOS device Bad pixels Dark current Flat field

12. Observed Image Quality 1.1 pixel FWHM

13. Imaging Information Filters: Y, J, H, K s Sky background: narrow OH emission and broad H 2 O absorption. Images unguided ~5 sec overhead between exposures, including telescope dither.

14. Imaging Sensitivity Time (sec)YJHKsKs 6019.619.919.718.7 30020.420.820.619.6 360021.822.221.921.0 Time for sky to reach half the linear regime 120 sec 180 sec 30 sec ? sec Total system throughput 0.200.250.500.40 Magnitude of point source (Vega mag) with S/N=10 Exposure Time Calculator: http://www.cfa.harvard.edu/mmti/mmirs.html

15. Total System Throughput

16. Spectroscopic Information Dispersed Spectra: 1400 pixels long Field for complete spectra: 2 x 6.9 arcmin Full field for spectroscopy: 4 x 6.9 arcmin 9 slit masks, 7 long slits: 420 x 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 2.4” Up to 40 slitlets, of minimum length 10” Grismλ um Grooves lines/mm Resolution 0.4” slit Efficiency HK1.45-2.4580130055-80% R3K0.9-2.562350030-55% JH0.95-1.8294130055-80%

17. Spectroscopic Sensitivity Exptime (hr)MagJJ dark HH dark K 115118125118165109 1175046366122 2173066518631 41771937212244 1197137184 21910199255 419152713357 Expected S/N per resolution element at R=3000 Slit mask Lab test: real spectra. Spectra

18. Schedule March/April 2009  ~1 week engineering run May/June 2009  ~2 week science “commissioning” Magellan 2010 (MMIRS and Megacam)

19. THE WEB SITE http://www.cfa.harvard.edu/mmti/mmirs.html THE TEAM Principal Investigator: B. McLeod Instrument Scientists: G. Furesz, P. Martini Optical design consultant: H. Epps Co-Investigators: D. Fabricant, J. Geary, S. Kenyon, W. Brown P. McCarthy, E. Persson, S. Eikenberry Project Manager: T. Norton Project Engineer: G. Nystrom Engineering Staff: K. McCracken, J. Holwell, M. Burke, S. Amato, J. Zajac, H. Bergner, S. Park, E. Hertz Software: D. Curley, M. Conroy, J. Roll, W. Wyatt Technicians: W. Brymer, F. Collette Machinists: K. Bennett, L. Knowles, and the Harvard Model Shop Commissioning Team: A. Seth, W. Brown, D. Fabricant, B. McLeod