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Blocking Filters

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.


The available slits are shown in the following table. The slit widths are given in pixels and arcsec projected on the sky. The spectral resolution is lower in a wider slit (see the grism table), even for point sources since under most atmospheric conditions the seeing wings of pointlike objects fill the wider slits. Note that for each f/6 slit width, 2 slits are available, one of which is offset from the optical axis and causes the spectrum to be shifted to shorter wavelengths on the array. Note also that the f/32 10 pixel wide slit and the f/6 2 pixel wide slit are the same slit.


Basic characteristics of T-ReCS's spectroscopy modes

T-ReCS is capable of spectroscopy with R~100 - 1000 in the 8–26 micron range as follows:


Basic characteristics of T-ReCS's imaging mode

Taken from the current T-ReCS Intro page

Observation Preparation

This section focuses on how to prepare NIRI observations for your Phase I and Phase II submissions. Preparing observing sequences involves much more than setting up the observation of the target; the complete observing sequences must include in addition "acquisition observations" (e.g., for finding the target and centering it on the image ) if needed, observations of telluric standards and/or flux standards, and usually includes flat field calibrations and dark frames.