IPP Software Navigation Tools IPP Links Communication Pan-STARRS Links

Changes between Version 3 and Version 4 of ppSub_vs_Hotpants


Ignore:
Timestamp:
Jan 15, 2010, 5:49:45 PM (17 years ago)
Author:
Paul Price
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • ppSub_vs_Hotpants

    v3 v4  
    9595== Comparison ==
    9696
     97The catastrophic failures of hotpants are most likely caused by the limited set of basis functions we've used, so they may be ignored.  However, it is clear that hotpants leaves a lot of structure (generally circular features) in the subtracted image.
     98
    9799It is apparent that ppSub (with default ISIS_RADIAL kernels and dual convolution) results in a subtracted image that appears more smoothed (because both images have been convolved, one doesn't see the small-scale pixel-to-pixel noise contributed by one of the images), but the subtraction is of generally of a better quality.  No sources are detected by psphot in 115 of the 136 subtractions.  When sources are detected, it is for the wide PSFs, and there are generally about 200, indicating two detections in the wings of each of the stars.  It's possible these could be suppressed with slightly different basis function parameters, and we are trying different distributions of kernel widths in order to do so.
    98100