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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 can be obtained in either normal or Nod-and-Shuffle modes using GMOS standard slits or custom slits.
GMOS can perform broad band imaging (using the SDSS filter system) or narrow-band imaging using select filters. The field of view is 5.5 arcmin x 5.5 arcmin (and does not cover the entire CCD package), with two ~ 2.8 arcsec (39 pixel) gaps between the detector chips, as shown below (GMOS-S, GMOS-N original EEV CCDs and upgraded e2v DD devices). To cover the gaps it is recommended to use dither steps of at least 5 arcsec in the X-direction.
A new Observing Tool is now available to support observations for the remainder of semester 2007A and for semester 2007B. All users will need to install this OT in order to either fetch programs from or store programs to the observing databases. Also, TOO triggers using the OT will need to be done using this version. Installation instructions and other details can be found here.
The observing system at Gemini is being updated to prepare for semester 2007B. The Gemini North observing database will be unavailable for fetch/store between 5-8 June and the database at Gemini South will be unavailable 6-8 June. TOO triggers via the OT will also not function during these periods but URL triggers will be accepted. Please monitor this page for further information and announcements of the new Observing Tool.