Summary of MD06.refstack.20121221

Similar to the MD06.GR0 (MD.GR0#MD06.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.

MD06 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 569 474 153
r 575 515 123
i 787 717 204
z 789 727 283
y 436 392 124

Status:

  • 12/21 selected exposure reprocessing chip->warp for refstack started
  • 12/25 reftests finished, full refstack started
  • 12/28 refstack finished, checked. staticsky single filter only running
  • 12/30 mappings made, reftest+refstack to distribution, refstack setup and diffims from 20121226 run

MD06.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: MD06.refstack.20121221 --> once set as active refstack for diffims, stack label will change to MD05.refstack, chip/cam/warp label will remain the same
  • data_group: MD06.refstack.20121221

New ipp-20121218 tag used -- pswarp/ppStack bug fixed initially, but keep eye out. changes include:

  • ?

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.20121221 (top blue) and used for refstack.20111122 (bottom blue) in grizy order

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

  • label: MD06.reftest.20121221
  • data_group:
    • MD06.reftest.20121221.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD06.reftest.20121221.all.<FWHM cut> where all means 2010+2011+2012 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD06.reftest.20121221.2011.<FWHM cut> where 2011 means 2011+2012 data only, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
  • c1:
    filter: (FWHM set), elongation, zeropoint, background limits
    y: (3.7, 4.1, 4.4, 4.8), 1.3, 22.5, 5000 -- 
    z: (3.8, 3.9, 4.0, 4.2), 1.3, 24.0, 2500 -- 
    i: (4.0, 4.2, 4.4, 4.6 max@117), 1.25, 24.3, 2000 -- 
    r: (4.2, 4.3, 4.6, 5.0), 1.25, 24.3, 500 -- 
    g: (4.8, 4.9, 5.2, 5.5), 1.25, 24.3, 400 -- 
    

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
| MD06.refstack.20121221        | g.00000 |  1962491 |       99 |        31 | 	 4.21  4.47 
| MD06.refstack.20121221        | r.00000 |  1962431 |       93 |        24 | 	 3.96  4.18 
| MD06.refstack.20121221        | i.00000 |  1962371 |       95 |        16 | 	 3.60  3.56 
| MD06.refstack.20121221        | z.00000 |  1962311 |       86 |        18 |  	 3.57  3.40 
| MD06.refstack.20121221        | y.00000 |  1962251 |       98 |        36 | 	 3.41  3.60 
	

--> reftest comparisons			
| MD06.reftest.20121221.all.52  | g.00000 |  1961861 |       75 |        22 | 	 4.16  4.42 
| MD06.reftest.20121221.2011.52 | g.00000 |  1961862 |       35 |         9 | 	 4.08  4.21 
| MD06.reftest.20121221.c1f48   | g.00000 |  1961879 |       38 |         6 | 	 4.60  4.21 
| MD06.reftest.20121221.c1f49   | g.00000 |  1961880 |       59 |        19 | 	 4.12  4.23 
| MD06.reftest.20121221.c1f52   | g.00000 |  1961881 |       99 |        31 | 	 4.21  4.50 
| MD06.reftest.20121221.c1f55   | g.00000 |  1961882 |      130 |        52 |	 4.23  4.58 
	
| MD06.reftest.20121221.all.46  | r.00000 |  1961859 |       82 |        20 | 	 3.92  4.13 
| MD06.reftest.20121221.2011.46 | r.00000 |  1961860 |       42 |         5 | 	 3.88  4.03 
| MD06.reftest.20121221.c1f42   | r.00000 |  1961875 |       39 |         8 | 	 3.86  3.98 
| MD06.reftest.20121221.c1f43   | r.00000 |  1961876 |       55 |        13 | 	 3.92  4.01 
| MD06.reftest.20121221.c1f46   | r.00000 |  1961877 |       93 |        22 | 	 3.97  4.22 
| MD06.reftest.20121221.c1f50   | r.00000 |  1961878 |      119 |        40 | 	 4.06  4.17 
	
| MD06.reftest.20121221.all.41  | i.00000 |  1961857 |       74 |        12 | 	 3.49  3.46 
| MD06.reftest.20121221.2011.41 | i.00000 |  1961858 |       36 |         7 | 	 3.48  3.49 
| MD06.reftest.20121221.c1f40   | i.00000 |  1961871 |       37 |        11 | 	 3.32  3.34 
| MD06.reftest.20121221.c1f42   | i.00000 |  1961872 |       60 |        10 | 	 3.47  3.48 
| MD06.reftest.20121221.c1f44   | i.00000 |  1961873 |       95 |        16 | 	 3.61  3.55 
| MD06.reftest.20121221.c1f46   | i.00000 |  1961874 |      116 |        27 | 	 3.62  3.57 
	
| MD06.reftest.20121221.all.41  | z.00000 |  1961855 |       75 |        17 | 	 3.50  3.34 
| MD06.reftest.20121221.2011.41 | z.00000 |  1961856 |       45 |        11 | 	 3.40  3.23 
| MD06.reftest.20121221.c1f38   | z.00000 |  1961867 |       41 |         7 | 	 3.46  3.25 
| MD06.reftest.20121221.c1f39   | z.00000 |  1961868 |       60 |        11 | 	 3.49  3.31 
| MD06.reftest.20121221.c1f40   | z.00000 |  1961869 |       86 |        20 | 	 3.50  3.40 
| MD06.reftest.20121221.c1f42   | z.00000 |  1961870 |      121 |        20 | 	 3.68  3.46 
	
| MD06.reftest.20121221.all.43  | y.00000 |  1961853 |       80 |        22 | 	 3.45  3.57 
| MD06.reftest.20121221.2011.43 | y.00000 |  1961854 |       40 |        11 | 	 3.54  3.65 
| MD06.reftest.20121221.c1f37   | y.00000 |  1961863 |       35 |         7 | 	 3.28  3.42 
| MD06.reftest.20121221.c1f41   | y.00000 |  1961864 |       62 |        15 | 	 3.41  3.55 
| MD06.reftest.20121221.c1f44   | y.00000 |  1961865 |       90 |        29 | 	 3.45  3.58 
| MD06.reftest.20121221.c1f48   | y.00000 |  1961866 |      126 |        46 |	 3.52  3.68 


--> previous 2011/2012 refstack			
| MD06.refstack.20111122        | g.00000 |   569827 |      113 |        15 | 	 4.68  5.45 
| MD06.refstack.20111122        | r.00000 |   568466 |      114 |         7 | 	 4.36  4.62 
| MD06.refstack.20111122        | i.00000 |   566789 |      108 |         1 | 	 3.94  3.92 
| MD06.refstack.20111122        | z.00000 |   564936 |      110 |         2 | 	 3.72  3.64 
| MD06.refstack.20111122        | y.00000 |   548440 |      107 |         8 | 	 3.69  3.83 

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: MD06.refstack.20121221, MD06.refstack.20121221
  • data_group: MD06.refstack.20121221.1x20121228, MD06.refstack.20121221.1x20121228.cal20121228

Source photometry psf_major,_minor maps (grizy):

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

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

Attachments