Image Details
Caption: Figure 1.
Distribution of the pixel S/N in BGS-Deep map at 500 μm (histogram). The scale on the y-axis is the number of pixels per bin of width 0.1. The positive tail is due to bright sources in the map. Because the map has a mean of zero, the peak of the distribution is shifted to the left of zero, as indicated by the vertical dotted line. A Gaussian (thick solid curve) is fit to the negative side of the histogram. For reference, the measured instrument noise (a Gaussian, with width 1.0 in units of S/N) is overplotted (thin dashed line). The map is clearly dominated by confusion noise.
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