PRIMUS 1d Reduction Status

From NYU CCPP Wiki

This is a page about the PRIMUS project.

This page is meant to document the current status of the 1d reductions and the ongoing efforts to improve the code. It is an outline mostly of the efforts we should be making towards calibration and redshift finding. That is, it is not an outline of code but of tasks.

1. Throughput determinations as a function of slit position
   1. Use sky to determine relative responses (as a function of CCD # and xy position)
      • Blanton has done a first cut based on rerun 0003, finding 10-20% corrections to defaults
      • Hogg is working on new redux
   2. Find absolute throughput from standard stars
      •  ???
   3. Test against F stars
      • Blanton has found large discrepancies not explained by throughput variations for rerun 0003
2. Modeling wavelength dependent slit-filling
   1. Test slit-filling model on sky lines
   2. Compare multiple observations on same slit position
      • Blanton has found factor of two level discrepancies in rerun 0003
   3. Use spatial PSF knowledge and simple model to ask for consistency
   4. Compare A and B slits
   5. Correct or incorporate into fitting procedure for redshifts and templates
3. Template fitting to calibration redshifts
   1. Define clean set of fitting redshifts
   2. Do minimal multiplicative corrections based on high-dimensional fit
   3. Fit NMF to get low-dimensional space of templates
   4. Refit for multiplicative corrections and iterate NMF
   5. Add stellar and QSO templates
4. Redshift finding and checking
   1. Speed up template2primus() -- Done
   2. Recover known redshifts, figure out how to identify errors
   3. Check color-magnitude diagrams as a function of redshift
   4. PRIMUS 1d STATUS - Gz323