Nod and Shuffle
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The GMOS Nod & Shuffle mode applies techniques adopted for the infrared to optical MOS, long-slit, and IFU (Gemini-South only) spectroscopy whereby the sky is sampled with the same pixels used to observe the science target.
The advantages of observing with Nod & Shuffle include:
- Improved sky subtraction
- Potential increased density of slits
Disadvantages of observing with Nod & Shuffle include:
- Increased observing overheads
- Potential decreased field of view
Further details about Nod & Shuffle mode provided in this section are as follows.