Summary of MD08.refstack.20130401

(back to MediumDeepFields summary)

Similar to the MD08.GR0 (MD.GR0#MD08.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 and all current detrend calibrations for the new season. Overall fewer inputs to the refstack were done this round and may not be as deep as last season.

MD08 observations:

  • starting ~mid-April 2013, already pre-obs in March
  • end-April 2012 through early Sept. 2012
  • early February 2011 through early Oct. 2011
  • early April 2010 through end Sept. 2010
  • mid-April 2009 through end Sept. 2009
Filter N total N FWHM<8 pixels N (FWHM<8 pixels for 2012
g 531 454 53
r 547 469 43
i 547 536 64
z 651 605 109
y 684 561 94
  • 2012 wasn't a great season for MD08

Status:

  • 04/0/13 selected exposure reprocessing chip->warp for refstack started (late due to power outage and messy system crashes)
  • 04/05 reftests finished, full refstack started
  • 04/06 refstack finished, checked and problem skycells found/fixed
  • 04/07 staticsky single filter only finished
  • 04/08 mappings finished, reftest+refstack to distribution
  • 04/18 refstack setup, recently missed exposures setup for diffims -- done

MD08.V3 Processing (chip->warp + refstack)

Exposure reprocessing was done for only a limited number (~150) of the best images from 2010-2012 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: MD08.refstack.20130401 --> once set as active refstack for diffims, stack label will change to MD08.refstack, chip/cam/warp label will remain the same
  • data_group: MD08.refstack.20130401

Newer ipp-20130307 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.20130401 (top blue) and used for refstack.20120422 (bottom blue) in grizy order

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

  • label: MD08.reftest.20130401
  • data_group:
    • MD08.reftest.20130401.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD08.reftest.20130401.all.<FWHM cut> where all means 03/2010+2011+2012 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD08.reftest.20130401.2012.<FWHM cut> where 2012 means 2012 data only for season stack example case, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
  • the main field center shift was through ~May 2010, but is a very small shift. Excluding 2009 since usually not very good, or uncharacteristically too good (avoiding problems basically)
  • c1 cuts
    filter: (FWHM set), elongation, zeropoint, background limits
    y: (3.5, 3.8, 4.0, 4.2), 1.3, 22.8, 4000 -- 
    z: (3.8, 3.9, 4.0, 4.2), 1.3, 24.0, 3000 -- 
    i: (4.0, 4.2, 4.4, 4.6), 1.25, 24.3, 2000 --
    r: (4.0, 4.3, 4.5, 4.7), 1.25, 24.3, 500 -- 
    g: (4.8, 5.0, 5.1, 5.3), 1.25, 24.3, 300 -- 
    

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)
+-------------------------------+---------+----------+----------+-----------+
--> 2013 refstack
| MD08.refstack.20130401        | g.00000 |  2198904 |       97 |        25 | 	 4.83  3.88 
| MD08.refstack.20130401        | r.00000 |  2198844 |       97 |        18 | 	 4.71  3.53 
| MD08.refstack.20130401        | i.00000 |  2198784 |       87 |        15 | 	 3.79  3.32 
| MD08.refstack.20130401        | z.00000 |  2198724 |       97 |        16 | 	 3.77  3.14 
| MD08.refstack.20130401        | y.00000 |  2198664 |      112 |        34 | 	 3.36  3.09 

--> reftest comparisons					
| MD08.reftest.20130401.all.50  | g.00000 |  2197863 |       82 |        23 | 	 4.72  3.71 
| MD08.reftest.20130401.2012.50 | g.00000 |  2197864 |       14 |         2 | 	 4.69  3.58 
| MD08.reftest.20130401.c1f48   | g.00000 |  2197881 |       32 |         6 | 	 4.64  3.58 
| MD08.reftest.20130401.c1f50   | g.00000 |  2197882 |       60 |        19 | 	 4.73  3.70 
| MD08.reftest.20130401.c1f51   | g.00000 |  2197883 |       85 |        24 | 	 4.80  3.80 
| MD08.reftest.20130401.c1f53   | g.00000 |  2197884 |      122 |        33 | 	 4.89  4.02 
| MD08.reftest.20130401.all.44  | r.00000 |  2197861 |       78 |        16 | 	 4.62  3.50 
| MD08.reftest.20130401.2012.44 | r.00000 |  2197862 |       14 |         3 | 	 4.54  3.40 
| MD08.reftest.20130401.c1f40   | r.00000 |  2197877 |       25 |         5 | 	 4.49  3.36 
| MD08.reftest.20130401.c1f43   | r.00000 |  2197878 |       55 |        10 | 	 4.60  3.48 
| MD08.reftest.20130401.c1f45   | r.00000 |  2197879 |       97 |        18 | 	 4.71  3.54 
| MD08.reftest.20130401.c1f47   | r.00000 |  2197880 |      133 |        27 | 	 4.72  3.60 
| MD08.reftest.20130401.all.42  | i.00000 |  2197859 |       72 |        16 | 	 3.73  3.23 
| MD08.reftest.20130401.2012.42 | i.00000 |  2197860 |       11 |         3 | 	 3.93  3.17 
| MD08.reftest.20130401.c1f40   | i.00000 |  2197873 |       28 |         7 | 	 4.12  3.12 
| MD08.reftest.20130401.c1f42   | i.00000 |  2197874 |       55 |         9 | 	 3.71  3.24 
| MD08.reftest.20130401.c1f44   | i.00000 |  2197875 |       87 |        15 | 	 3.80  3.32 
| MD08.reftest.20130401.c1f46   | i.00000 |  2197876 |      130 |        21 | 	 3.89  3.48 
| MD08.reftest.20130401.all.39  | z.00000 |  2197857 |       90 |        22 | 	 3.69  3.08 
| MD08.reftest.20130401.2012.39 | z.00000 |  2197858 |       22 |         4 | 	 3.75  3.12 
| MD08.reftest.20130401.c1f38   | z.00000 |  2197869 |       36 |         7 | 	 3.62  2.99 
| MD08.reftest.20130401.c1f39   | z.00000 |  2197870 |       70 |        11 | 	 3.71  3.09 
| MD08.reftest.20130401.c1f40   | z.00000 |  2197871 |       97 |        15 | 	 3.76  3.13 
| MD08.reftest.20130401.c1f42   | z.00000 |  2197872 |      127 |        22 | 	 3.80  3.18 
| MD08.reftest.20130401.all.38  | y.00000 |  2197855 |       81 |        10 | 	 3.26  2.96 
| MD08.reftest.20130401.2012.41 | y.00000 |  2197856 |        7 |         3 | 	 3.83  3.41 
| MD08.reftest.20130401.c1f35   | y.00000 |  2197865 |       31 |         5 | 	 3.15  2.78 
| MD08.reftest.20130401.c1f38   | y.00000 |  2197866 |       66 |        15 | 	 3.26  2.92 
| MD08.reftest.20130401.c1f40   | y.00000 |  2197867 |       93 |        34 | 	 3.31  3.02 
| MD08.reftest.20130401.c1f42   | y.00000 |  2197868 |      121 |        42 | 	 3.39  3.11 
	
--> previous 2012 refstack				
| MD08.refstack.20120422        | g.00000 |   874973 |       96 |         2 | 	 5.09  4.07 
| MD08.refstack.20120422        | r.00000 |   875033 |       90 |         1 | 	 4.77  3.64 
| MD08.refstack.20120422        | i.00000 |   875265 |       91 |         3 | 	 4.35  3.48 
| MD08.refstack.20120422        | z.00000 |   884902 |       94 |         3 | 	 3.80  3.22 
| MD08.refstack.20120422        | y.00000 |   884962 |       93 |         7 | 	 3.36  3.08 

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
  • g,i in particular seems to vaguely show the arc of shallower depth but no where close to what last year's refstack had
  • skycell details:
    • y: s012 poor/odd image so rerun with DEEP_STACK to allow more inputs at the cost of slightly degraded PSF; s063,074 bad cell print through (can't fix unless exclude warps directly, dynamic masks need to be fixed); couple skycells have excessive detection regions
    • z: s028, s017 poor/odd image so rerun with DEEP_STACK
    • i: s028, s071,087 poor/odd image so rerun with DEEP_STACK
    • r: s028,082 poor/odd image so rerun with DEEP_STACK
    • g: s012,017,082 poor/odd image so rerun with DEEP_STACK; many many ghosts s014,023,024,025,026,033,035,036,037,041,042.. 062,063 strong ; s024,033 odd junk (cleaned ghost); 074,075 odd junk; s028g since never completes (odd fault/crash) so rerun with DEEP_STACK

Core coverage -- one of the larger shifted pointings so very different from normal distribution of skycells (also see detection efficiency maps below)

082-087
071-078
061-068
051-058
041-048
031-038
021-028
012-017
  • skycells with fewer inputs: 012,017,021,028,071,078,082; 012,021,071,078,082 ~50% or less

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: MD08.refstack.20130401, MD08.refstack.20130401
  • data_group: MD08.refstack.20130401.1x20130407, MD08.refstack.20130401.1x20130407.cal20130407

Source photometry psf_major,_minor maps (grizy):

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

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

Attachments