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T-ReCS contains three entrance windows that are interchangeable in real
time; the control software selects the window that is best for the
specific observation and conditions.
T-ReCS contains 7 slit masks for spectroscopy, plus an "open" mask and an occulting bar for imaging mode. The slit widths are chosen to match the lambda/D and 2*lambda/D conditions at the upper end of the 10 and 20 µm wavelength bands, plus the lambda/D condition at three additional wavelengths in the 10 µm band. The lambda/D slits will generally provide the best spectral resolution in good seeing; the 2*lambda/D slits may be better in poor seeing or for fainter sources.
T-ReCS contains three diffraction gratings and an optical flat mounted on a rotating turret. Each diffraction grating is used in first order.
T-ReCS contains up to 20 filters mounted in two wheels. This page describes the current set of filters.
T-ReCS contains three entrance windows that are interchangeable in real time; the control software selects the window that is best for the specific observation and conditions.
T-ReCS contains the same detector as Michelle . Some basic characteristics of the detectors are shown in the table below:
Basic characteristics of T-ReCS's imaging mode
T-ReCS is capable of imaging in the 8–26 micron range as follows:
- Broad-band (N, Q) and Narrow-band Filter Imaging
- Pixel size = 0.09" (fixed)
- Field of view = 28.8"×21.6"
- Number of filters: currently 20, capacity for 24
- Occulting bar available for imaging (2" wide)
The principal T-ReCS imaging modes, plus the typical settings of five instrument components in each mode, are listed in the following table.
The following table gives wavelength ranges of the order-sorting filters in NIRI that are used with the grisms. The Gemini identification number for each filter is recorded in data file headers.