Version 2 (modified by mhuber@…, 6 years ago)

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Summary of MD07.refstack.20130102

Similar to the MD07.GR0 (MD.GR0#MD07.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 may not be as deep as last season.

MD07 observations:

  • starting end December 2012
  • early January 2012 through mid-June 2012
  • early January 2011 through end June 2011
  • end December 2009 through end June 2010
  • early April 2009 through end June 2009
Filter N total N FWHM<8 pixels N (FWHM<8 pixels for 2011/2012
g
r
i
z
y

Status:

  • 01/02/13 selected exposure reprocessing chip->warp for refstack started
  • 01/03 reftests finished, full refstack started
  • 01/05 refstack finished, checked. staticsky single filter only running
  • 01/06 mappings made, reftest+refstack to distribution, refstack setup

MD07.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: MD07.refstack.20121221 --> once set as active refstack for diffims, stack label will change to MD07.refstack, chip/cam/warp label will remain the same
  • data_group: MD07.refstack.20130102

New ipp-20121218 tag used.

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.20130102 (top blue) and used for refstack.20111106 (bottom blue) in grizy order

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

  • label: MD07.reftest.20130102
  • data_group:
    • MD07.reftest.20130102.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD07.reftest.20130102.all.<FWHM cut> where all means 2010+2011+2012 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD07.reftest.20130102.2011.<FWHM cut> where 2011 means 2011+2012 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
| MD07.refstack.20130102        | g.00000 |  1964987 |       87 |        16 | 	 4.30  3.68
| MD07.refstack.20130102        | r.00000 |  1964922 |       86 |        13 | 	 4.17  3.56
| MD07.refstack.20130102        | i.00000 |  1964856 |       99 |        22 | 	 3.99  3.31
| MD07.refstack.20130102        | z.00000 |  1964790 |       92 |        15 | 	 3.44  3.09
| MD07.refstack.20130102        | y.00000 |  1964724 |       97 |        22 | 	 3.19  3.17

--> reftest comparisons				
| MD07.reftest.20130102.all.52  | g.00000 |  1964660 |       83 |        19 | 	 4.27  3.62
| MD07.reftest.20130102.2011.52 | g.00000 |  1964661 |       33 |         5 | 	 4.24  3.52
| MD07.reftest.20130102.c1f47   | g.00000 |  1964678 |       32 |        12 | 	 4.10  3.31
| MD07.reftest.20130102.c1f50   | g.00000 |  1964679 |       69 |        14 | 	 4.25  3.60
| MD07.reftest.20130102.c1f51   | g.00000 |  1964680 |       87 |        15 | 	 4.30  3.67
| MD07.reftest.20130102.c1f53   | g.00000 |  1964681 |      114 |        24 |	 4.38  3.81
| MD07.reftest.20130102.all.46  | r.00000 |  1964658 |       91 |        14 | 	 4.17  3.56
| MD07.reftest.20130102.2011.46 | r.00000 |  1964659 |       28 |         7 | 	 4.15  3.52
| MD07.reftest.20130102.c1f42   | r.00000 |  1964674 |       34 |        11 | 	 4.06  3.34
| MD07.reftest.20130102.c1f44   | r.00000 |  1964675 |       61 |        16 | 	 4.09  3.44
| MD07.reftest.20130102.c1f46   | r.00000 |  1964676 |       86 |        13 | 	 4.17  3.56
| MD07.reftest.20130102.c1f47   | r.00000 |  1964677 |      121 |        33 | 	 4.23  3.63
| MD07.reftest.20130102.all.41  | i.00000 |  1964656 |       77 |        17 | 	 3.91  3.24
| MD07.reftest.20130102.2011.41 | i.00000 |  1964657 |       39 |         9 | 	 3.83  3.26
| MD07.reftest.20130102.c1f40   | i.00000 |  1964670 |       39 |         8 | 	 3.84  3.16
| MD07.reftest.20130102.c1f41   | i.00000 |  1964671 |       55 |         9 | 	 3.87  3.21
| MD07.reftest.20130102.c1f43   | i.00000 |  1964672 |       86 |        18 | 	 3.97  3.26
| MD07.reftest.20130102.c1f45   | i.00000 |  1964673 |      127 |        36 | 	 4.01  3.36
| MD07.reftest.20130102.all.41  | z.00000 |  1964654 |       86 |        24 | 	 3.44  3.08
| MD07.reftest.20130102.2011.41 | z.00000 |  1964655 |       37 |         5 | 	 3.23  3.01
| MD07.reftest.20130102.c1f38   | z.00000 |  1964666 |       37 |        14 | 	 3.27  2.98
| MD07.reftest.20130102.c1f39   | z.00000 |  1964667 |       53 |         8 | 	 3.35  3.02
| MD07.reftest.20130102.c1f41   | z.00000 |  1964668 |       92 |        16 | 	 3.44  3.09
| MD07.reftest.20130102.c1f42   | z.00000 |  1964669 |      116 |        25 | 	 3.50  3.14
| MD07.reftest.20130102.all.43  | y.00000 |  1964652 |       84 |        17 | 	 3.02  2.96
| MD07.reftest.20130102.2011.43 | y.00000 |  1964653 |        6 |         2 |	 4.10  3.57
| MD07.reftest.20130102.c1f37   | y.00000 |  1964662 |       34 |        11 | 	 2.91  2.78
| MD07.reftest.20130102.c1f40   | y.00000 |  1964663 |       59 |        13 | 	 3.04  2.98
| MD07.reftest.20130102.c1f42   | y.00000 |  1964664 |       85 |        26 | 	 3.11  3.09
| MD07.reftest.20130102.c1f46   | y.00000 |  1964665 |      121 |        31 | 	 3.26  3.26

--> previous 2011/2012 refstack				
| MD07.refstack.20111106        | g.00000 |   524269 |      152 |        11 | 	 4.59  4.03
| MD07.refstack.20111106        | r.00000 |   524197 |      138 |         6 | 	 4.42  3.89
| MD07.refstack.20111106        | i.00000 |   524120 |      126 |        19 | 	 4.26  3.67
| MD07.refstack.20111106        | z.00000 |   519315 |      126 |        10 | 	 3.83  3.42
| MD07.refstack.20111106        | y.00000 |   512135 |      116 |         8 | 	 3.29  3.21

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).
  • like others, greater % of inputs rejected (20-30%) so per pixel input is less, but still of order 30 inputs per pixel
  • some convolved stacks have poorer FWHM PSF but not significant enough to be likely improved by reprocessing using DEEP_STACK config as in earlier MD fields.
  • skycell.087 in y,z,i may be odd. skycell.028 in g-band likely undersampled.
  • appears sky in some edge skycells my have offset.
  • bad cell segments primarily in y-band skycell.042,052,057,063 from ota14, cell 31
  • poor/bad cell in all filters for skycell.044, some 033.
  • misc clusters of ghosts in g-band (046,052,053,061), some in r-band (042)

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

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: MD07.refstack.20130102, MD07.refstack.20130102
  • data_group: MD07.refstack.20130102.1x20130105, MD07.refstack.20130102.1x20130105.cal20130105

Source photometry psf_major,_minor maps (grizy):

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

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

Attachments