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KOSMOS and COSMOS: New facility instruments for the NOAO 4-meter telescopes

  • Martini, Paul
  • Elias, J.
  • Points, S.
  • Sprayberry, D.
  • Derwent, M. A.
  • Gonzalez, R.
  • Mason, J. A.
  • O'Brien, T. P.
  • Pappalardo, D. P.
  • Pogge, R. W.
  • Stoll, R.
  • Zhelem, R.
  • Daly, P.
  • Fitzpatrick, M.
  • George, J. R.
  • Hunten, M.
  • Marshall, R.
  • Poczulp, G.
  • Rath, S.
  • Seaman, R.
  • And 2 more
Publication Date
Jul 16, 2014
Submission Date
Jul 16, 2014
DOI: 10.1117/12.2056834
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We describe the design, construction and measured performance of the Kitt Peak Ohio State Multi-Object Spectrograph (KOSMOS) for the 4-m Mayall telescope and the Cerro Tololo Ohio State Multi-Object Spectrograph (COSMOS) for the 4-m Blanco telescope. These nearly identical imaging spectrographs are modified versions of the OSMOS instrument; they provide a pair of new, high-efficiency instruments to the NOAO user community. KOSMOS and COSMOS may be used for imaging, long-slit, and multi-slit spectroscopy over a 100 square arcminute field of view with a pixel scale of 0.29 arcseconds. Each contains two VPH grisms that provide R~2500 with a one arcsecond slit and their wavelengths of peak diffraction efficiency are approximately 510nm and 750nm. Both may also be used with either a thin, blue-optimized CCD from e2v or a thick, fully depleted, red-optimized CCD from LBNL. These instruments were developed in response to the ReSTAR process. KOSMOS was commissioned in 2013B and COSMOS was commissioned in 2014A.


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