GMACS: A Moderate-dispersion Optical Spectrograph for the Giant Magellan Telescope

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Abstract
Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS) is a first-light moderate-dispersion imaging spectrograph under development at the Center for Astrophysics and Steiner Institute for the Giant Magellan Telescope. GMACS operates between 330 and 1050 nm with resolution 1000 < R < 5000 using a 0 . ″ 7 wide slit. The total slit length is 7′ with a field 6′ wide in the dispersion direction. GMACS carries 17 exchangeable aperture masks. Resolution > 10,000 is possible with the MANIFEST optical fiber front end that will initially address a 14′ diameter field. Standing 5 m tall with a mass of 11,000 kg, GMACS has two arms with 260 mm collimated beams split with a dichroic at 630 nm.
Funding Information
  • Giant Magellan Telescope project

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