Changes between Version 40 and Version 41 of Background_Dark_Model

Timestamp:

Apr 9, 2012, 3:14:42 PM (14 years ago)

Author:

watersc1

Comment:

--

Background_Dark_Model

@@ -1 +1 @@
 [wiki:Background_Continuity Return] 
+
+== April 9, 2012 ==
+
+=== Easter weekend questions ===
+
+ 1. '''From the fixedgain_improvement.png plot, most cells appear to be in XY67, are the other cells from a single chip?''' No, although the cells do seem to be clustered in some bad OTAs.  Taking a minimum improvement of 10 as the cutoff:
+|| OTA   || XY17 || XY27 || XY15 || XY55 || Xy34 || XY06 || XY11 || XY23 || XY24 || XY33 || XY43 || XY54 || XY62 || XY73 || XY74 ||
+|| Ncells|| 9 || 7 || 6 || 5 || 4|| 2 || 1|| 1||1||1||1||1||1||1||1||1||
+ 1. '''I guess the points in that figure with Gain/1.1 >> 1 and delta of 0.0
+are otherwise bad, masked, and thus have no detections, right?''' Correct.  Examples are OTA76:xy66, OTA17:xy50, etc.
+ 1. '''There is a single odd cell at Gain/1.1 ~ 80 and delta ~ 200 -- who is that?''' OTA73:xy33.  This appears to be a bad cell in general, with a defect noticable in noisemap/dark/science images.  This cell might be better off fully masked.
+ 1. '''2D plot of XY67 to confirm our expectations (that the terrible cells
+are no longer so terrible -- if we still see the same xy00 sticking
+out badly, despite losing 500 detections, then we are only getting a
+tweak on this chip as well as the others)'''
+[[Image(q4.png,400px)]]
+ 1. '''2D plot of the full mosaic false detections, showing only the >5
+sigma detections (and maybe a plot with the SDSS matches removed,
+though another plot showing the locations of the SDSS matches would be
+needed to show the overlap).'''
+[[Image(q5.png,400px)]]
+ 1. '''one of the 1D plots to see if we still have the position dependent
+problem (I'm guessing yes)'''
+[[Image(col2_gaintest.png,400px)]]
+ 1. '''For the noisemap data, can you make a CDF of the N_1 detections vs
+1/MAG_PSF_ERR?  If we decide to reduce the false positives by tossing
+out objects below some cut, that plot would tell us the S/N hit we
+will take to reach a given level of confidence.'''
+[[Image(q7.png,400px)]]
+ 1. '''Finally, what are the N_1 vs N_12 numbers only for the region of SDSS
+overlap if you exclude < 5sigma and SDSS matches?  That really is our
+current bottom-line mean false positive rate (though if the SDSS
+overlap avoids a few really bad chips, it could be somewhat under
+counted).'''
+[[Image(q8.png,400px)]]
+
+
 
 == April 5, 2012 ==