Summary of MD04.refstack.20121125

Similar to the MD04.GR0 (MD.GR0#MD04.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.

MD04 observations:

  • starting end of November 2012
  • end of November 2011 through early May 2012
  • mid-December 2010 to end of April 2011
  • end November 2009 to early May 2010
Filter N total N FWHM<8 pixels N (FWHM<8 pixels for 2011/2012
g 498 430 117
r 491 456 121
i 587 559 156
z 558 533 195
y 299 285 81

Status:

  • 11/24 selected exposure reprocessing started
  • 11/25 reftest runs to be setup, evaluated.
  • 11/26 setup being overrun by LAP staticsky, the refstacks started but will take >3x longer than normal.. maybe done by end of week
  • 12/02 refstack runs finished, out to distribution, turned on for diffims

MD04.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: MD04.refstack.20121125 --> once set as active refstack for diffims, stack label will change to MD04.refstack, chip/cam/warp label will remain the same
  • data_group: MD04.refstack.20121125

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.20121122 (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: MD04.reftest.20121125
  • data_group:
    • MD04.reftest.20121125.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD04.reftest.20121125.all.<FWHM cut> where all means 2009+2010+2011 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD04.reftest.20121125.2010.<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
| MD04.refstack.20121125        | g.00000 |  1878335 |       89 |        21 | 	 4.37  4.00
| MD04.refstack.20121125        | r.00000 |  1878275 |       90 |        27 | 	 4.14  3.71
| MD04.refstack.20121125        | i.00000 |  1878215 |       92 |        20 | 	 3.68  3.23
| MD04.refstack.20121125        | z.00000 |  1878155 |       89 |        18 | 	 3.70  3.13
| MD04.refstack.20121125        | y.00000 |  1878094 |       92 |        25 | 	 3.56  3.32

--> reftest comparisons			
| MD04.reftest.20121125.all.52  | g.00000 |  1871830 |       90 |        23 | 	 5.04  3.90
| MD04.reftest.20121125.2011.52 | g.00000 |  1871831 |       47 |        13 |	 4.12  3.75
| MD04.reftest.20121125.c1f47   | g.00000 |  1874148 |       32 |         6 | 	 4.10  3.66
| MD04.reftest.20121125.c1f51   | g.00000 |  1874149 |       54 |        11 | 	 4.21  3.81
| MD04.reftest.20121125.c1f53   | g.00000 |  1874150 |       84 |        21 | 	 5.11  3.98
| MD04.reftest.20121125.c1f56   | g.00000 |  1874151 |      115 |        33 | 	 4.42  4.08
	
| MD04.reftest.20121125.all.46  | r.00000 |  1871828 |       84 |        25 | 	 4.07  3.62
| MD04.reftest.20121125.2011.46 | r.00000 |  1871829 |       36 |        10 | 	 4.04  3.60
| MD04.reftest.20121125.c1f42   | r.00000 |  1874144 |       32 |         5 | 	 3.95  3.48
| MD04.reftest.20121125.c1f46   | r.00000 |  1874145 |       63 |        16 | 	 4.07  3.61
| MD04.reftest.20121125.c1f49   | r.00000 |  1874146 |       90 |        25 | 	 4.16  3.72
| MD04.reftest.20121125.c1f52   | r.00000 |  1874147 |      125 |        37 | 	 4.24  3.79
	
| MD04.reftest.20121125.all.41  | i.00000 |  1871826 |       92 |        23 | 	 3.60  3.16
| MD04.reftest.20121125.2011.41 | i.00000 |  1871827 |       61 |        19 | 	 3.49  3.17
| MD04.reftest.20121125.c1f38   | i.00000 |  1874140 |       35 |         8 | 	 3.39  3.08
| MD04.reftest.20121125.c1f40   | i.00000 |  1874141 |       57 |        13 | 	 3.52  3.13
| MD04.reftest.20121125.c1f43   | i.00000 |  1874142 |       92 |        21 | 	 3.68  3.24
| MD04.reftest.20121125.c1f46   | i.00000 |  1874143 |      119 |        24 | 	 3.76  3.30
	
| MD04.reftest.20121125.all.41  | z.00000 |  1871824 |       86 |        24 | 	 3.64  3.06
| MD04.reftest.20121125.2011.41 | z.00000 |  1871825 |       66 |        13 | 	 3.68  3.13
| MD04.reftest.20121125.c1f37   | z.00000 |  1874136 |       34 |         9 | 	 3.54  2.94
| MD04.reftest.20121125.c1f40   | z.00000 |  1874137 |       59 |        11 | 	 3.62  3.03
| MD04.reftest.20121125.c1f42   | z.00000 |  1874138 |       89 |        18 | 	 3.69  3.13
| MD04.reftest.20121125.c1f45   | z.00000 |  1874139 |      127 |        23 |	 3.83  3.25
	
| MD04.reftest.20121125.all.43  | y.00000 |  1871822 |       77 |        19 | 	 3.51  3.25
| MD04.reftest.20121125.2011.43 | y.00000 |  1871823 |       35 |         9 |  	 3.41  3.10
| MD04.reftest.20121125.c1f38   | y.00000 |  1874132 |       35 |         7 | 	 3.39  3.06
| MD04.reftest.20121125.c1f42   | y.00000 |  1874133 |       62 |        15 | 	 3.49  3.23
| MD04.reftest.20121125.c1f45   | y.00000 |  1874134 |       92 |        24 | 	 3.54  3.31
| MD04.reftest.20121125.c1f48   | y.00000 |  1874135 |      122 |        38 | 	 3.63  3.40

--> previous 2011/2012 refstack			
| MD04.refstack.20111012        | g.00000 |   452523 |      113 |         8 | 	 5.53  4.39
| MD04.refstack.20111012        | r.00000 |   450933 |      128 |         9 | 	 5.20  4.09
| MD04.refstack.20111012        | i.00000 |   450168 |       92 |        11 | 	 4.04  3.60
| MD04.refstack.20111012        | z.00000 |   450210 |      109 |         2 | 	 4.21  3.57
| MD04.refstack.20111012        | y.00000 |   453818 |      107 |         0 |	 4.02  3.85


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 (to be updated)

  • generally edge skycells have issues, need better containment of those still. (see Core coverage below).
  • some convolved stacks have strange/poor FWHM PSF, high rejection -- 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: --
    • r: --
    • i: --
    • z: 071 replaced with DEEP_STACK version
    • y: --
  • bad cell arc in primarily skycell.025,036,047 y-band from ota14, cell 31, s036,046 in z. Odd print through in 036,056i and 014,027,044g and 076g around bright star
  • 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.

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: MD04.refstack.20121125, MD04.refstack.20121125
  • data_group: MD04.refstack.20121125.1x20121130, MD04.refstack.20121125.1x20121130.cal20121130

Source photometry psf_major,_minor maps (grizy):

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

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

Attachments