[daip] IMAGR {External}

[egreisen]

On 2021-11-10 08:55, Jose-Maria Torrelles wrote:
> Dear Eric, I hope every thing is going well there with you and family.
> 
> I am writing to ask you if it is possible to make within AIPS
> continuum images with IMAGR and EVLA data at K band with 61 IFs and 64
> channels each (covering in total 7.8 GHz), without using CASA. If so,
> it is there any document where I could go for reading?
> 
> I am sorry to ask you directly, but I did not find documentation on
> this if that is possible.
> 
> Thank you in advance,
> 
> Chema
> ——————————
> José María Torrelles Arnedo
> Institut de Ciències de l’Espai (IEEC-CSIC)
> Barcelona

AIPS limits are 90 IFs and many many channels - so no problem.  Such
a wide bandwidth will be affected by spectral index.  You may have to
make an image at each IF to begin with and then create a spectral
index image.  Do this by making a cube of the single IF images, then
TRANS and SPIXR.  Then you can run IMAGR with all IFs and IN3NAME
pointing at the spectral index image.  A generous FQTOL will allow
the task to run more efficiently.  If the source extends seriously
out into the primary beam then that alone will look like a spectral
index issue.

Eric Greisen