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. The expected noise from the background measurement has been subtracted from the measured noise for each coadd. The plots show histograms of those residuals.
Note that the absolute zero of the fit is somewhat arbitrary, especially at H and K, and I have not spent much effort to make the residuals either symmetric about zero or to have a mean of zero. The fit is used solely to understand the distribution of the residual points, and hence the zero level is arbitrary. The highest bin contains all the points with higher values.
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http://spider.ipac.caltech.edu/staff/tchester/2mass/analysis/galaxies/backgrounds/residual_noise_histos.html
Comments and feedback: Tom Chester
Last update: 12 October 1998.