GMOS

Gemini North Gemini SouthOptical

Last Modified:

Sunday, August 11, 2024 - 02:42

The two Gemini Multi-Object Spectrographs (GMOS), one on each telescope, provide 0.36-1.03 µm long-slit and multi-slit spectroscopy and imaging over a 5.5 square arcminute field of view. Each GMOS is also equipped with an Integral Field Unit (IFU) making it possible to obtain spectra from a 35 square arcsecond area with a sampling of 0.2 arcseconds. The Nod-and-Shuffle mode, which enables superior sky subtraction, is available with both GMOS-N and GMOS-S in most spectroscopic modes.

Available For Proposals at Gemini North
For more details, see the schedules and the CfPs.
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Available For Proposals at Gemini South
For more details, see the schedules and the CfPs.
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Capability Summary

Total wavelength range = 360−1030 nm

Imaging (Read more)

5.5’ square field of view
0.0807"/pixel spatial sampling
broad and narrow band filters

Spectroscopy

Resolutions (See grating options)
- 1260−8800 for 0.25" slit (depending on grating)
- 210−1460 for 1.5" slit (depending on grating)
Modes
- Single Longslit (Read more)
  - Slit length of 5.5’
- Multi-Object Spectroscopy (Read more)
  - Using 5.5’ square masks
- Integral Field Unit (IFU), fiber fed, 0.2" sampling (Read more)
  - IFU-2, 7" x 5", 1000 spaxels
  - IFU-R, 3.5" x 5", 500 spaxels

Guiding Options

GMOS On-Instrument Wavefront Sensor (OIWFS)
Periferal Wavefront Sensor 2 (PWFS2)

Get the sensitivity
Get to the integration time calculator

The GMOS were built by a collaboration of the Astronomy Technology Centre at the ROE, the University of Durham in the UK and the Herzberg Institute of Astrophysics in Canada. GMOS-N was delivered in July 2001 with GMOS-S following in December 2002.

GMOS Mechanism