The two Gemini Multi-Object Spectrographs (GMOS), one on each telescope, provide 0.36-1.10 µm long-slit and multi-slit spectroscopy and imaging over a 5.5 arcmin field of view. Each GMOS is also equipped with an Integral Field Unit (IFU) making it possible to obtain spectra of an area of about 35 square arcsec with a sampling of 0.2 arcsec. The Nod-and-Shuffle mode, enabling superior sky subtraction, is available with both GMOSs in most spectroscopic modes.

The GMOSs were built by a collaboration of the Astronomy Technology Centre at the ROE and 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.

The Instrument Scientists for GMOS are Rodrigo Carrasco (GMOS-S) and Kathy Roth (GMOS-N).

Announcements

GMOS-N B600 grating unavailable. See the Status and Availability page for current instrument configurations.

GMOS science highlights

How to use these pages

The GMOS pages are organized as follows.

• Status and Availability: Modes available in the current and upcoming semesters; current grating and slit configurations
• Nod-and-Shuffle: All you ever wanted to know about this remarkable GMOS capability - including when and how to use it
• Imaging: GMOS is not just a MOS, or an S; it is a camera too; info on camera properties, filters and detectors
• Spectroscopy Overview: Introduction and properties of gratings, blocking filters, and detectors
• Long-slit Spectroscopy
• Multi-object Spectroscopy (including mask-making)
• Integral Field Spectroscopy
• Sensitivity and Overheads: Sensitivity tables, integration time calculator, and details of observing overheads
• Guiding Options: The GMOS OIWFS and how to use it; when to use the peripheral wavefront sensors with GMOS
• Calibration: Info on GCAL, flats and arcs, standard stars, and baseline calibrations
• Observation Preparation: How to configure GMOS in the Observing Tool; observing strategies and checklists
• Data Format and Reduction: Examples of GMOS data and links to data reduction resources
• Documents: GMOS optical layout; design documents and references