(Edited based on re-reading the documentation this morning.)
Does any one here have experience with multi-frequency synthesis in AIPS? I've got a WSRT data set with 8 continuous IFs each with 64 channels. I'm currently setting
bif=1; eif=8
bchan=2; echan=50; nchav=49
in IMAGR.
I was going to run it through self-calibration as usual.(See the following post for details.) Is there anything else I need to do?
[Edited 11/11/09: See Michael Rupen's comment on this post for the answer.]
Friday, November 6, 2009
Multi-frequency synthesis in AIPS?
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2 comments:
IMAGR handles "standard" MFS,
meaning that it grids the data according to the actual observing frequency in each channel, thus giving improved uv-coverage; and correctly subtracts the model from each channel independently. For this you simply specify NCHAV etc. as you have done.
More sophisticated corrections are also possible inside IMAGR, including primary beam corrections and simple source spectral index corrections. These use
IMAGRPRM(1), IMAGRPRM(2), IMAGRPRM(17), and FQTOL, and are described in the IMAGR EXPLAIN file under "WIDE-FIELD, WIDE-BAND CORRECTIONS".
Hope this helps --
Michael Rupen
NRAO/Socorro
Thanks Michael!
This is just what I wanted to know. It's not entirely clean from the IMAGR help file that IMAGR will do the standard MFS.
I'd run into the other parameters in the explain file, but fortunately in this case they aren't really necessary.
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