Summary of MD10.refstack.20120705/20120804

Similar to the MD10.GR0 (MD.GR0) refstacks for the 2011/2012 season, new one includes recent improvement and input cuts to help constrain the convolved stacks as well. Because the refstack is made with reprocessed pixels, the refstack pixels will now have the ubercalibration.

The MD10.refstack.20120705 was found to have the weight pixel problem causing arc of lower sensitivity over multiple skycells, is replaced with MD10.refstack.20120804 now.

MD10 observations started end of July (last season started mid-July and ended early December).

Filter	N total	N (FWHM<8 pixels)
g	491	438
r	493	462
i	448	396
z	462	428
y	305	302

MD10.V3 Processing (chip->warp + refstack)

Exposure reprocessing was done for only a limited number (~150) of the best images from 2010+2011 to provide a balance of N input warps versus best seeing, excluding exposures with large background, low zeropoints and large elongation. Processing chip-warp and the refstack itself has the same label, data_group

• label: MD10.refstack.20120705
• data_group: MD10.refstack.20120705

Replacement refstack made using the 20120705 reprocessed exposures

• label: MD10.refstack.20120804 --> once becomes the active refstack, label changed to MD10.refstack
• data_group: MD10.refstack.20120804

Histograms of the FWHM major and minor and elongation from camera stage value (full exposure) for the sample of reprocessed exposures 20120705 (red) and used for refstack.20120804 (top blue) and used for refstack.20110821 (bottom blue) in grizy order

Test stack (reftest) sample also made again for skycell.055 with different number of input warps.

• label: MD10.reftest.20120705
• data_group:
  • MD10.reftest.20120705.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
  • MD10.reftest.20120705.all.<FWHM cut> where all means 2009+2010+2011 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
  • MD10.reftest.20120705.2011.<FWHM cut> where 2011 means 2011 data only, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>

Summary comparison table with the approximate FWHM (major) as the PSF FWHM from a center field skycell (V3=055) after running psphot on the stacks. Because the reftests were all run on the same date, the stack_id is important to note to separate by filter as well.

version data_group	filter	center skycell input warps (rej)	center skycell FWHM (major, pixels)
new MD10.refstack.20120705	g	()	"
MD10.reftest.20120705.c1f	g	()	"
MD10.reftest.20120705.c1f	g	()	"
MD10.reftest.20120705.c1f	g	()	"
MD10.reftest.20120705.c1f	g	()	"
MD10.reftest.20120705.c1f	g	()	"
MD10.reftest.20120705.c1f	g	()	"
old MD10.refstack.20110821	g	()	"
new MD10.refstack.20120705	r	()	"
MD10.reftest.20120705.c1f	r	()	"
old MD10.refstack.20110821	r	()	"
new MD10.refstack.20120705	i	()	"
MD10.reftest.20120705.c1f	i	()	"
old MD10.refstack.20110821	i	()	"
new MD10.refstack.20120705	z	()	"
MD10.reftest.20120705.c1f	z	()	"
old MD10.refstack.20110821	z	()	"
new MD10.refstack.20120705	y	()	"
MD10.reftest.20120705.c1f	y	()	"
old MD10.refstack.20110821	y	()	"

Problems

• generally edge skycells have issues, need better containment of those still.
• some convolved stacks have strange PSF -- reprocessed using DEEP_STACK config with lighter input restrictions so may not have best FWHM, but 99% on the edge of field so won't anyways.
  • g: 038, 045
  • r: ---
  • i: ---
  • z: ---
  • y: ---
• bad cell arc in primarily skycell.036,033,024,025,026,047 y-band from ota14, cell 31

• misc ghosts in g-band

Refstack Summary

Refstacks run through the staticsky (full 5 filter mode with deteff measurements) and skycal stage on the unconvolved stacks:

• label: MD10.refstack.20120804, MD10.refstack.20120803
• data_group: MD10.refstack.20120804.1x20120805, MD10.refstack.20120804.1x20120805.cal20120805

Replacement MD10.refstack.20120804 rerun through staticsky (single filter mode so basic psphot with deteff measurements) and skycal stage on the unconvolved stacks

Source photometry psf_major,_minor maps (grizy):

Magnitude of sources@5-sigma maps (grizy):

Detection efficiency magnitude @50% recovery (500 fakes, grizy):