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Detector Information

Michelle contains the same detector as T-ReCS. Some basic characteristics of the detectors are shown in the table below:


The properties of NIRI in imaging mode are summarized in the following sections. Three selectable fields of view and pixel scales are available. With adaptive optics NIRI is available at f/32 for J-L' imaging (but see caveats for L'), and at f/14 for imaging out to 2.5 microns due to the increased thermal background. Imaging at L' is impossible at f/6 and only sometimes possible at f/14. The narrow band L filters (e.g., the PAH filter, Br alpha) can be observed at f/32, f/14, and f/6. M' imaging is only possible at f/32.


Overview of NIRI's Capabilities

Gemini's Near InfraRed Imager and Spectrometer, NIRI, was built by the University of Hawaii's Institute for Astronomy. It provides a range of imaging and spectroscopy options in the 1-5 micron wavelength region.

Observing with Gemini

How to observe with Gemini. Is this better as an expanded menu with a lot of items, as it is now (broken up by headings for Phase I and Phase II), or with just 3 expandable subheadings beneath it, or broken into two categories (phases 1 and 2) at the top level?


Basic characteristics of Michelle's imaging mode

  • Several medium and narrow-band 10 um and 20 um filters (chop and nod)
  • Image FWHM at or approaching the diffraction limit (FWHM ~ 1.22 lambda/D ~ 0.31" at 10 microns, ~0.63" at 20 microns)
  • Pixel dimension = 0.1005" (imaging only)
  • Field of view = 32"x24" in imaging mode (but note that current maximum chop throw is 15")
  • Imaging usually not available using the broad band N and Q filters, due to detector saturation


Overview of Michelle's Capabilities

Michelle is a mid-infrared (7-26 micron) imager and spectrometer, formerly in use at UKIRT but now on long-term loan at Gemini. Michelle is available for imaging and spectroscopy with all of its gratings and its echelle. Imaging polarimetry is now also supported.

Long-slit Spectroscopy

Long slit spectroscopy can be obtained in either normal or Nod-and-Shuffle modes using GMOS standard slits or custom slits.