GMOS

GMOS (for Gemini Multi-Object Spectrograph) is the name of each of two instruments on the two Gemini Observatory telescopes, more specifically called GMOS-N (operational on Gemini North beginning in 2002) and GMOS-S (on Gemini South beginning in 2003). Each has an integral field unit (IFU) covering 5.5 × 5.5 arcminute field of view. They offer spectral resolutions up to R = 10,0000. They offer the following modes of operation:

• Multi-object using slit masks.
• Lenslet/fiber integral field spectroscopy, the IFU designed to use 1000 fibers for target observation and another 500 to support sky subtraction.
• Long slit spectroscopy.
• Imaging.