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GIRMOS – Gemini Infrared Multi-Object Spectrograph

The Dunlap Institute is leading the development of an infrared spectrograph for the Gemini Observatory called the Gemini Infrared Multi-Object Spectrograph, or GIRMOS.

GIRMOS is designed to produce high angular-resolution and highly sensitive infrared images of the sky. It will image four objects simultaneously within a two arc-minute field of view—a capability known as multiplexing.

The spectrograph will target high-redshift (1 < z < 10) galaxies to help in the study of their formation and evolution, back to a time in the early universe when galaxies were first forming. It will also help in the investigation of galaxy mergers in dense environments.

It will enable near-field cosmology through the study of metal-poor stars in the Milky Way Galaxy’s central bulge. It will also help astronomers study star formation physics in the Milky Way.

GIRMOS will serve as a precursor to the IRMOS spectrograph, a high-priority instrument for the Thirty-Meter Telescope now under construction in Hawai’i. It will serve as an important follow-up instrument for the James Webb Space Telescope (JWST) when it is launched in 2018.

GIRMOS is designed for use on the 8-metre telescopes of the Gemini Observatory, the largest telescopes available to Canadian astronomers.

Major partners include:

  • Adaptive optics: Dalhousie University, University of Victoria,
  • Calibration: UBC
  • Spectrographs: U of T; Université Laval
  • Software: Saint Mary’s University; NRC

Additional partners include York University and University of Manitoba

The project is being led by the Dunlap’s Professor Suresh Sivanandam, and is being funded through a Canadian Foundation for Innovation (CFI) award of $5 million, with $7.8 million from provincial and other partners. The funding was announced in October 2017.

Additional resources:  Gemini Infrared Multi-Object Spectrograph: preliminary design overview (December 2020).


Gemini South Observatory on Cerro Pachón in northern Chile. Image: Gemini Observatory; AURA