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Introduction

GO-IRS Instrument
GO-IRS Instrument
The GTC Optical Intermediate Resolution Spectrograph or GO-IRS is a recently proposed instrument for the Gran Telescopio de Canarias (GTC).  This instrument is designed to be a powerful tool for answering basic questions about both the nearby and distant universe.  GO-IRS is an optical multi-object spectrograph that can take between 1000 and 1600 spectra at a time, covering a spectral range from 370 to 1000 nm. In order to achieve this, GO-IRS can be run in two distinct modes.  The first mode uses a fiber positioner that can align up to 1000 MOS fibers covering a field of view of 15 arcmin in diameter.  This mode can have spectral resolutions of, 2000, 5000, 10000, and 20000.  The second mode is to use 4 Integral Field Units each with 400 fibers providing 1600 spectra over a field of view of 2 arcmin in diameter.  This mode can have resolutions of approximately 7000, 13000, and 20000.  The GO-IRS instrument is composed of two identical spectrographs, each of which has a blue (370- 600nm) and a red channel (600-1000 nm) which allows for significant wavelength coverage, with each observation.  These abilities will make GO-IRS a powerful player when compared with other facility class instruments such as Deimos on Keck, FLAMES and VIMOS on the VLT and the upcomming VIRUS on HET.

The Science

In order to take advantage of an instrument of this versatility, 3 science surveys have been developed by about eighty astronomers from 30 different institutions, mainly in Spain, USA, China and Mexico.  These surveys are designed to investigate three distinct distance scales in the universe:
  • Near Field Cosmology:   Observing 200,000 stars in the field of the Milky Way
  • Nearby Galaxies:             Measuring the resolved stellar populations and kinematics of galaxies in the local universe
  • The Distant Galaxy:         Observing 250,000 galaxies at z from 0.6 to 1.6
Greater details about these goals can be found in the science section of this site.

More information

For more information about the capabilities of GO-IRS instrument check here.   For more information about the GO-IRS collaboration, check the Participants section of this site.  Finally, if you would like to become involved with either the main surveys or as part of our Guest observing program check our Opportunities section.




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