Changes between Version 1 and Version 2 of stacking_coverage.20130307

Timestamp:

Apr 11, 2013, 12:11:53 PM (13 years ago)

Author:

watersc1

Comment:

--

stacking_coverage.20130307

@@ -16 +16 @@
 
 [[Image(limits.png)]]
+
+== 2013-04-04 ==
+
+I have the first set of ppStack changes in place and merged to the trunk.  This includes the fix for the PSF target that was resulting in excess detections.  I have run a test on the same SAS stack that Ken and Heather were using for IRAF tests.  This test has the SAFE flag set to FALSE, allowing single inputs to contribute.
+
+[[Image(iraf_ppstack_comp.jpg,800px)]]
+
+== 2013-03-07 ==
+
+For the Arp 220 example, of the six input warps that contain the galaxies, two are excluded due to large FWHM, with another warp having a FWHM close to the hard limit of 7.5.  This input was excluded in the original processing, but not in my reprocessing of the warps (FWHM for the reprocessing was 7.48).  Because of this, only three (four) warps are available.  We currently enforce the "safe combination" rules, which do not allow a pixel to be populated from only one input exposure.  The following images show the input warps that contain Arp 220, with the top showing the reprocessed set, and the bottom showing the original warps.  The red X show which inputs were excluded due to their FWHM being large.  Below that is a comparison of the stacks obtained for these warps with the default combination (left panels) and with the FWHM limit set to 100, which allows all warps to contribute (right panels).
+
+[[Image(23_a1.png)]]
+
+[[Image(23_a2.png)]]