Summary of MD05.refstack.20121202

Similar to the MD05.GR0 (MD.GR0#MD05.GR0) refstacks for the 2011/2012 season, these include 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. Overall fewer inputs to the refstack were done this round and will not be excessively deep as last season.

MD05 observations:

  • starting early December? 2012
  • mid-December 2011 through early June 2012
  • end-December 2010 to mid-June 2011
  • 4/05/2009, end November 2009 to early June 2010
Filter N total N FWHM<8 pixels N (FWHM<8 pixels for 2011/2012
g 609 537 155
r 579 530 144
i 602 556 188
z 674 611 246
y 464 431 108

Status:

  • 11/30 prep for mix of updates from recent reprocessing and full reprocessing of exposures for stacks
  • 12/01 selected exposure reprocessing, updates started
  • 12/02 reftest runs to be setup, evaluated.
  • 12/03 setup being overrun by LAP + staticsky, the refstacks started but will take >3x longer than normal.. maybe done by end of week
  • 12/06 refstack runs finished, distributed, ready for MD05 diffims

MD05.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: MD05.refstack.20121202 --> once set as active refstack for diffims, stack label will change to MD05.refstack, chip/cam/warp label will remain the same
  • data_group: complicated since mix of updates and reprocessing
    • MD05.refstack.20121202 -- reprocessed from recent 2012 exposures post-ubercal (~April onwards)
    • MD05.GR0.20121005 -- reprocessed in Oct., was cleaned so updated instead of reprocessed
    • MD05.GR0.20121030_redo2012preubercal -- reprocessed in Oct. of pre-ubercal exposures from 2012, was cleaned so updated instead of reprocessed
    • MD05.GR0.20121104_redo20111011preubercal -- reprocessed in early Nov. of pre-ubercal exposures from 2011, was cleaned so updated instead of reprocessed

New ipp-20121026 tag used but shouldn't be any large changes for refstack processing versus ipp-20120802.

Histograms of the FWHM major and minor and elongation from camera stage value (full exposure) for the sample of reprocessed exposures (red) and used for refstack.20121202 (top blue) and used for refstack.20111012 (bottom blue) in grizy order

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

  • label: MD05.reftest.20121202
  • data_group:
    • MD05.reftest.20121202.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD05.reftest.20121202.all.<FWHM cut> where all means 2009+2010+2011 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD05.reftest.20121202.2010.<FWHM cut> where 2010 means 2010+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.

| data_group                    | filter  | stack_id | warps_in | warps_rej |  FWHM_MAJ   IQ_FW1 (pixels)
+-------------------------------+---------+----------+----------+-----------+
--> 2012/2013 refstack
| MD05.refstack.20121202        | g.00000 |  1895418 |      101 |        29 | 	 4.90  4.11
| MD05.refstack.20121202        | r.00000 |  1895358 |       97 |        21 | 	 4.83  3.95
| MD05.refstack.20121202        | i.00000 |  1895298 |       99 |        25 | 	 3.69  3.35
| MD05.refstack.20121202        | z.00000 |  1895238 |       95 |        13 | 	 3.71  3.28
| MD05.refstack.20121202        | y.00000 |  1895178 |      100 |        26 | 	 3.55  3.43

--> reftest comparisons			
| MD05.reftest.20121202.all.52  | g.00000 |  1889330 |       93 |        18 | 	 4.86  4.00
| MD05.reftest.20121202.2011.52 | g.00000 |  1889331 |       55 |        14 | 	 4.74  3.84
| MD05.reftest.20121202.c1f47   | g.00000 |  1890254 |       21 |         5 | 	 4.59  3.62
| MD05.reftest.20121202.c1f51   | g.00000 |  1890255 |       56 |        19 | 	 4.82  3.81
| MD05.reftest.20121202.c1f53   | g.00000 |  1890256 |       83 |        16 | 	 4.83  4.06
| MD05.reftest.20121202.c1f56   | g.00000 |  1890257 |      121 |        35 | 	 5.02  4.17
	
| MD05.reftest.20121202.all.47  | r.00000 |  1889328 |       90 |        20 | 	 4.80  3.90
| MD05.reftest.20121202.2011.47 | r.00000 |  1889329 |       58 |        16 | 	 4.70  3.85
| MD05.reftest.20121202.c1f42   | r.00000 |  1890250 |       18 |         6 | 	 4.50  3.49
| MD05.reftest.20121202.c1f46   | r.00000 |  1890251 |       68 |        14 | 	 4.69  3.87
| MD05.reftest.20121202.c1f48   | r.00000 |  1890252 |       97 |        20 | 	 4.81  3.95
| MD05.reftest.20121202.c1f52   | r.00000 |  1890253 |      115 |        35 | 	 4.84  3.96
	
| MD05.reftest.20121202.all.41  | i.00000 |  1889332 |       80 |        20 | 	 4.16  3.28
| MD05.reftest.20121202.2011.41 | i.00000 |  1889333 |       52 |        14 | 	 4.08  3.27
| MD05.reftest.20121202.c1f38   | i.00000 |  1890246 |       17 |         5 | 	 3.75  3.14
| MD05.reftest.20121202.c1f41   | i.00000 |  1890247 |       65 |        13 | 	 4.10  3.28
| MD05.reftest.20121202.c1f43   | i.00000 |  1890248 |       99 |        24 | 	 3.69  3.36
| MD05.reftest.20121202.c1f44   | i.00000 |  1890249 |      116 |        19 | 	 3.73  3.39
	
| MD05.reftest.20121202.all.40  | z.00000 |  1889334 |       78 |        20 | 	 3.65  3.26
| MD05.reftest.20121202.2011.40 | z.00000 |  1889335 |       37 |         6 | 	 3.58  3.24
| MD05.reftest.20121202.c1f38   | z.00000 |  1890242 |       30 |        10 | 	 3.49  3.13
| MD05.reftest.20121202.c1f40   | z.00000 |  1890243 |       70 |        12 | 	 3.65  3.24
| MD05.reftest.20121202.c1f41   | z.00000 |  1890244 |       95 |        14 | 	 3.71  3.29
| MD05.reftest.20121202.c1f42   | z.00000 |  1890245 |      120 |        24 | 	 3.77  3.33
	
| MD05.reftest.20121202.all.40  | y.00000 |  1889336 |       88 |        21 | 	 3.52  3.36
| MD05.reftest.20121202.2011.40 | y.00000 |  1889337 |       34 |         8 | 	 3.56  3.19
| MD05.reftest.20121202.c1f37   | y.00000 |  1890238 |       45 |        11 | 	 3.45  3.16
| MD05.reftest.20121202.c1f39   | y.00000 |  1890239 |       64 |        24 | 	 3.48  3.24
| MD05.reftest.20121202.c1f41   | y.00000 |  1890240 |      100 |        25 | 	 3.56  3.44
| MD05.reftest.20121202.c1f42   | y.00000 |  1890241 |      123 |        32 |	 3.57  3.44

--> previous 2011/2012 refstack		
| MD05.refstack.20111014        | g.00000 |   458078 |      154 |         8 | 	 5.59  4.63
| MD05.refstack.20111014        | r.00000 |   458070 |      156 |        15 | 	 5.23  4.34
| MD05.refstack.20111014        | i.00000 |   458062 |      147 |        17 | 	 4.13  3.73
| MD05.refstack.20111014        | z.00000 |   457921 |      132 |         4 | 	 3.89  3.46
| MD05.refstack.20111014        | y.00000 |   457812 |      133 |         4 | 	 3.93  3.84



As before, the FWHM_MAJOR with the central skycell can be variable and more so with largely different input sets. Comparison with the psf_major/minor maps are more useful between refstack versions.

Problems

  • generally edge skycells have issues, need better containment of those still. (see Core coverage below).
  • some convolved stacks have strange/poor FWHM 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. Seems to be fewer problems compared to previous refstacks.
    • g: 086 redo with DEEP_STACK but also with fewer inputs, contrary to other MD cases this will likely have smaller FWHM but not be as deep.
    • r: --
    • i: --
    • z: --
    • y: --
  • bad cell arc in primarily skycell.033,024,025,026,047 y-band from ota14, cell 31. Not really seen in skycell.036 like others. ??
  • poor/bad cell arc in primarily skycell.064 g-band (and less so in other filters) from ota43, cell 54? see MD10.refstack.20120705 where was in skycell.054. ??
  • misc clusters of ghosts in g-band

Core coverage is the default set

82-87
x1-x8
12-17
  • weaker (fewer inputs) for 012,017,021,028,071,078,082,087 in various filters
  • using 2009 data in y-band and even in other years has provided some additional edge skycells in the refstack to be aware or wary of. Likely won't be covered enough for many diffims.
    • g:
    • r:
    • i:
    • z:
    • y:

Refstack Summary

Refstacks run through the staticsky (single filter mode so basic psphot with deteff measurements) and skycal stage on the unconvolved stacks to make the map plots (full 5 filter version still having occasional faults to work through):

  • label: MD05.refstack.20121202, MD05.refstack.20121202
  • data_group: MD05.refstack.20121202.1x2012120x, MD05.refstack.20121202.1x2012120x.cal2012120x

Source photometry psf_major,_minor maps (grizy):

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

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

Attachments