2MASS coadd image background noise

Currently I am making simple GALPHAT analysis tool for generating model image and residual image. Then chi^2 will be calculated for zero-th order goodness of fit test. For doing this, I have to know model variance to compare the deviation of observation from the model. 

Different observations produce different science images(i.e. some images are coadded, smoothed,rebinned etc.). I have to know how my input images are generated. For 2MASS images, I found the information of background noise of coadd image(a.k.a atlas image). See the following by Tom Chester etal.

http://web.ipac.caltech.edu/staff/tchester/2mass/analysis/noise/index.html

And most recent version is

http://www.ipac.caltech.edu/2mass/releases/allsky/doc/sec6_8a.html#tbl1

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~ by ilsangyoon on January 17, 2009.

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