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Depth-Of-Coverage Statistics on Ecliptic | |
Below we show plots of the expected distribution in depth-of-coverage on the ecliptic equator by co-adding frames from a simulation provided by N. Wright. This uses frames from the "pattern-free" simulation. Frames were coadded with AWAIC and then the depth-of-coverage maps from four separate co-add fields straddling the equator were combined to improve the statistics.
The goal was to explore the impact of bad-pixel clusters on the
depth-of-coverage statistics. Figure 1 shows the masks for each band.
Band 1 shows two noticeble bad-pixel clusters. These manifest themselves
as dark depressions in the band 1 depth-of-cocerage map (see Figure 2).
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| Figure 1 - Bad-pixel masks for each band: top left: band 1; top right: band 2; bottom left: band 3; bottom right: band 4. Black corresponds to bad pixel regions. Click to enlarge. |
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| Figure 2 - Depth-of-coverage maps for bands 1, 2, 3, and 4 (left to right). Each is a nominal co-add size: ~1.56° x 1.56° (1.375″ square pixels). The color bars give the approximate depth. Click any panel to enlarge. | |||
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| Band 1 | Band 2 |
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| Band 3 | Band 4 |
| Figure 3 - Histograms of the depth-of-coverage for bands 1, 2, 3, and 4. These combine coverage information from all four field coadds (for each independent band) made for the "pattern-free" simulation. Click any panel to enlarge. | |
Cumulative distributions for depths-of-coverage > 10 are shown in Figure 4. Results for depths ≤ 10 are shown in Figure 5.
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| Band 1 | Band 2 |
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| Band 3 | Band 4 |
| Figure 4 - Cumulative distributions for the depth-of-coverage for bands 1, 2, 3, and 4. These show the fraction of area on the ecliptic expected to have ≤ the coverage shown. These plots combine coverage maps from all four field coadds (for each independent band) made for the "pattern-free" simulation. See Figure 5 for distributions at coverages ≤ 10. Click any panel to enlarge. | |
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| Band 1 | Band 2 |
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| Band 3 | Band 4 |
| Figure 5 - Same as Figure 4 but for depths-of-coverage ≤ 10. Click any panel to enlarge. | |
BAND 1:
Number of pixels stored = 67076100
mean = 11.9103021394592
RMS = 1.20215769537885
median = 11.9164462089539
min = 0.529662728309631
max = 15.9927034378052
Cumulative fracs = [0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65
0.7 0.75 0.8 0.85 0.9 0.95 1]
Coverages = [10.067747 10.629538 10.94128 11.00125 11.046514 11.086864
11.132582 11.19337 11.342668 11.916446 12.025912 12.094937
12.17063 12.314831 12.936725 13.069364 13.167703 13.345622
14.152724 15.992703]
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BAND 2:
Number of pixels stored = 67076100
mean = 11.8859757688953
RMS = 1.19741776385463
median = 11.8795642852783
min = 0.676648259162903
max = 15.879695892334
Cumulative fracs = [0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1]
Coverages = [10.05083 10.609124 10.900267 10.973898 11.021377 11.064923
11.111538 11.17352 11.328173 11.879564 11.999904 12.073208
12.150533 12.298614 12.895801 13.039029 13.141081 13.321171
14.125063 15.879696]
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BAND 3:
Number of pixels stored = 67076100
mean = 11.8671613357595
RMS = 1.17350155507794
median = 11.7816801071167
min = 1.73996388912201
max = 15.9028911590576
Cumulative fracs = [0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1]
Coverages = [10.081156 10.414162 10.938917 11.010045 11.056849 11.098354
11.141448 11.193563 11.279788 11.78168 12.010733 12.090059
12.161337 12.258809 12.772371 13.053835 13.161867 13.303425
14.125949 15.902891]
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BAND 4:
Number of pixels stored = 67076100
mean = 11.7953973720407
RMS = 1.15403821748415
median = 11.6012411117554
min = 8.47854423522949
max = 15.7335634231567
Cumulative fracs = [0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1]
Coverages = [10.061921 10.31951 10.838555 10.962691 11.024333 11.07108
11.115225 11.165167 11.242381 11.601241 11.918406 12.039187
12.119802 12.211817 12.555788 12.9572 13.107442 13.248242
14.022199 15.733563]