[daip] about FLUX in UVMOD

Leonia Kogan lkogan at nrao.edu
Mon Jul 16 12:39:04 EDT 2007

Dear Miyoshi, M,

UVMOD adds the noise to each visibility with RMS=FLUX/SQRT(WEIGHT),
where WEIGHT is the weight of this visibility.
The idea is to add less noise for the visibilities with bigger weights.
In practice, the visibilities corresponding to the bigger antennas and
less noise temperature of the receivers are assigned with bigger 
weights. Therefore adding less noise for the bigger weight visibilities 
has a sense.

Leonid Kogan

makoto.miyoshi at nao.ac.jp wrote:
> Dear Sirs,
> I am using the task UVMOD in AIPS.
> I would like to add thermal noise into fake visibility
> by changing the FLUX parameter in UVMOD.
> The comment about the FLUX says only,
> "FLUX is noise level to be added (in Jy. per Weight).
> I am not sure the meaning of the Weight in here.
> I would like to know the relation between FLUX in UVMOD 
> to real physical parameters like SFED.
> Could you tell me ?
> Miyoshi, M.
> NAOJ Mitaka
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