Deep2 23hr B Oct06

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This is a page about the PRIMUS project.

The DEEP2 observations for October 2006 are meant to provide simultaneously a complement to the DEEP2 spectroscopy, by targeting those galaxies that didn't pass the DEEP2 color cut, and calibration redshifts by targeting some of the DEEP2 redshifts. This data set, in combination with DEEP2 itself, should provide a good training set for SDSS photo-zs.

The October run has some slight changes to the May run.

  1. We've now included SKY slits, since we want them for testing sky subtraction
  2. The slits are 1.6 arcsec long
  3. Instead assigning QA slits after all priorities are done, we look for space for QA slits after priority 505 is done. Then at the end we do 605 (only allowing each 605 object on one mask). This is mask generation method "repeat" implemented in primus_maskgen_repeat.pro.
  4. We implement the new sparse sampling that allows noncolliding DEEP2_COMP_FAINT targets into priority 305 with 100% likelihood, but colliding ones with 30% likelihood.

We are using SDSS stars for the alignment. There are some significant residuals between the SDSS and DEEP2 here (at the 0.2 arcsec level) systematically depending mostly on RA and offset mostly in the DEC direction. Since these appear in comparison with multiple SDSS runs, we trust the SDSS better than DEEP2. We fit these out as best we can, and apply the corrections to all DEEP2 sources. These corrections are different (and we think better) than the May 2006 astrometry corrections.

The priorities are:

  1. SDSS_CALIB (105): SDSS F stars
  2. SDSS_AGN (205): Richards et al (2004) photometric QSOs with g < 21 (and i > 19) from their DR3 catalog)
  3. DEEP2_COMP_BRIGHT, DEEP2_COMP_FAINT (305): Sparse-sampled complementary DEEP2 galaxies (that is, z < 0.7). Bright set is R < 22.8, faint set is 100% of those with 22.8 < R < 23.3 which only collide with zero or one other objects (of this priority level), 30% of those that collide with more.
  4. DEEP2_BRIGHT (405): DEEP2 spectroscopic galaxies with R < 22.8
  5. DEEP2_FAINT (505): DEEP2 spectroscopic galaxies with R > 22.8
  6. DEEP2_COMP_FILL (605): Remainder of DEEP2 complementary set (those eliminated in the density-dependent sparse sampling step).

The designs for the October 2006 run are at

http://sdss.physics.nyu.edu/primus/design/deep2_23hr_b/masks/oct06

Overall statistics for the primary sample (305) of the October 2006 run are at

http://sdss.physics.nyu.edu/primus/design/deep2_23hr_b/masks/oct06/deep2_23hr_b_oct06_stats.txt

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