Cosmos v1a May06

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This is a page about the PRIMUS project.

The COSMOS field is a large HST pointing with lots of multiwavelength coverage. It is meant to be our bread and butter science for Spring 2006. The May run has some slight changes to the March run:

  1. We've removed SKY and COSMOS_GALAXY_FAINTEST, because as Daniel puts it, milling more slits is not costless
  2. We've reduced the bright star mask by a factor of two in radius
  3. The slits are 1 arcsec wide and the alignment boxes are 5 arcsec
  4. Where possible, we put alignment stars in the outer annulus of a bright star mask. For these masks, I don't think this every actually happens.

We've assumed that the original COSMOS masks 4 and 5 are "done". Masks 6 to 11 of the March run are now replaced with 18 to 23 of the May run. Objects on masks 4 and 5 have not been allowed on masks 18 to 23.

The priorities are:

  1. SDSS_CALIB (102): SDSS F-stars (~ 30)
  2. COSMOS_GALAXY, COSMOS_GALAXY_FAINT (202): COSMOS 17.3<i<22.7 galaxies plus 30% of 22.7<i<23.2 galaxies, density dependent sparse sampled (~ 2000)
  3. COSMOS_GALAXY_FILL (302): Remainder of 17.3<i<22.7 galaxies (~ 300)
  4. COSMOS_GALAXY_FAINT_FILL (402): Remainder of 30% of 22.7<i<23.2 galaxies (~ 30)
  5. COSMOS_PSF (502): COSMOS PSFs with i<23.2 (~ 300)
  6. COSMOS_GALAXY_FAINT_FILL2 (602): The other 70% of 22.7<i<23.2 galaxies (~ 300)

There are about 3000 total in a mask.

The designs for the May 2006 run are at

http://sdss.physics.nyu.edu/primus/design/cosmos_v1a/masks/may06

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