Changes between Version 5 and Version 6 of QUB_MDS_diff_analysis_20091204

Timestamp:

Dec 4, 2009, 4:56:27 AM (17 years ago)

Author:

dravg.uk.belfast

Comment:

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QUB_MDS_diff_analysis_20091204

@@ -1 @@
-On this page you will find an analysis of the November 2009 re-release of the MD08 data taken in June 2009. The example difference image shown is of Skycell 102 and was created by subtracting a ''convolved'' stack image from a target image (the unconvolved stack is also shown for completeness). Sources identified in the difference image by the IPP are marked with circles: '''GREEN CIRCLES''' indicate sources where ''no'' bad-flag is set, '''RED CIRCLES''' indicate sources where a bad-flag ''is'' set. These circle are also superimposed on the stacked images for comparison's sake.
+On this page you will find an analysis of the November 2009 re-release of the MD08 data taken in June 2009. The example difference image shown is of Skycell 102 and was created by subtracting a ''convolved'' stack image from a target image (the unconvolved stack is also shown for completeness). Sources identified in the difference image by the IPP are marked with circles: '''GREEN CIRCLES''' indicate sources where ''no'' bad-flag is set, '''RED CIRCLES''' indicate sources where a bad-flag ''is'' set. These circles are also superimposed on the stacked images for comparison's sake.
+
+(Note that in this particular skycell, only one bad flag was raised - PM_SOURCE_MODE_MOMENTS_FAILURE.)
 
 A comparison of a detail taken from the full difference image (white rectangle) with the corresponding detail taken from the stacked images reveals that bright sources have been heavily over-subtracted and are found as negative sources in the difference image. Any fresh transients located in the target images will therefore appear as negative sources in the difference images and the IPP will fail to detect them.