These plots are for all processed coadds that have magnitude thresholds for unconfused areas, which are 15.50, 14.75 and 14.25 mag for J, H and K, respectively. There are 25,706; 25,705 and 25,710 such coadds at J, H and K, respectively. Note that the K histogram is quite different from the other bands due to the significant seasonal variation, and hence its histogram will change as we process more data from different time periods.
The percentile points are 1, 5, 10, 25, 50, 75, 90, 95 and 99%.
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| Histogram of Noises | |||||||||
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| Percentile Rank | j | h | k | ||||||
| coadd noise | bkgnd_sigma | bkgnd_sigma/coadd noise | coadd noise | bkgnd_sigma | bkgnd_sigma/coadd noise | coadd noise | bkgnd_sigma | bkgnd_sigma/coadd noise | |
| 0.01 | 0.43 | 0.42 | 0.68 | 0.73 | 0.70 | 0.38 | 0.79 | 0.77 | 0.77 |
| 0.05 | 0.46 | 0.45 | 0.88 | 0.82 | 0.78 | 0.60 | 0.84 | 0.81 | 0.90 |
| 0.10 | 0.48 | 0.46 | 0.93 | 0.86 | 0.82 | 0.71 | 0.87 | 0.84 | 0.93 |
| 0.25 | 0.50 | 0.49 | 0.96 | 0.93 | 0.88 | 0.85 | 0.95 | 0.93 | 0.97 |
| 0.5 | 0.53 | 0.51 | 0.98 | 1.04 | 0.95 | 0.94 | 1.14 | 1.11 | 0.98 |
| 0.75 | 0.56 | 0.54 | 0.98 | 1.22 | 1.04 | 0.98 | 1.23 | 1.21 | 0.99 |
| 0.90 | 0.61 | 0.57 | 1.00 | 1.51 | 1.14 | 0.99 | 1.29 | 1.25 | 1.00 |
| 0.95 | 0.67 | 0.61 | 1.00 | 1.82 | 1.20 | 0.99 | 1.32 | 1.27 | 1.00 |
| 0.99 | 0.82 | 0.70 | 1.00 | 3.03 | 1.44 | 1.00 | 1.51 | 1.32 | 1.00 |
http://spider.ipac.caltech.edu/staff/tchester/2mass/analysis/galaxies/backgrounds/low_density/percent_plots.html
Comments and feedback: Tom Chester
Last update: 15 October 1998.