Deep emission line search mode
Idea: Forget blocking filter - let object spectra overlap
- Put slits on thousands of objects!
- Push to R=25-26 for numbers
We get rid of sky via shuffling
- Search for emission lines allowing for sky variance map
- Ambiguity is which line belongs to which slit
? resolve via grating rotation.
Like a slitless survey, but much lower background (70x) - most of sky is masked out.
- “Pseudoslitless mode”
- Prior knowledge of where objects are from broad-band.