[daip] Shifting maps and UVSUB'ing

[Eric Greisen]

Andrew Biggs wrote:
> Hi Eric. This is perhaps a slightly bizarre question. I have a very bright
> source in my primary beam which I wish to peel. I have made a very nice
> map of it via lots of experimentation (with self-cal'ing, clean boxes,
> etc.) by shifting the u,v data to the location of the source using UVFIX
> and then heavily averaging the data in both frequency and time to try and
> suppress any contamination from other sources in the field. I mainly did
> this because it's much, much quicker to experiment.
> 
> In this way I end up with a fantastic map of the source and a good SN
> table. My question is, after applying the SN table, can I subtract this
> map directly from the *unshifted* data? The coordinates in the map's
> header are clearly okay, but I worry about the part of the header that says
> 
> "Phase shifted in X  -1002.213  in Y   -881.334".
> 
> Is this a problem?

It should not be a problem but check the output closely to see if it worked.

Eric Greisen