Hi,
I am trying to produce a noise map with one of our 5.5GHz continuum observations. There is a sfind.rms image produced after the miriad task sfind to detect sources, but that map just has a constant value over the whole image (for all rmsbox values I tried: 50, 1000, 5000, 10000, 23494); also, the sfind.log catalogue has a rms(bg) column with all values being the same, which are weird...
I am wondering if there's a problem with that noise estimate and is that the right way to produce a noise map? I'm thinking of the residual map, but that might be different with the noise map?
Thanks!
Tai-An