[daip] A&P selfcal

[Farhad Zadeh]

Hi Eric,
I am back doing things in aips. A simple question. Is there a way to 
make a cube of a bunch of UV data sets corresponding to
different IFs? I am doing things the hard way, self cali in amp for 
indivifdual IFs and then need to put together to make images adding in
the spectral index in the imager. I appreciae. There should be something 
like UVcube like MCUBE.
Cheers,
Farhad



On 1/21/16 2:19 PM, Eric Greisen wrote:
> On 01/21/2016 12:22 PM, Farhad Zadeh wrote:
>> Hi Eric,
>> Can you please let me know the best way to do amplitude self-cal on a
>> cube that has multiple IFs and the central source (Sgr A*) varies as a
>> function of frequency.
>> It is not clear what the spectrum is.
>> Do I need to split the cube into individual IF data sets  and then
>> self-cal one by one and then put them back together?
>>    Any suggestions would be appreciated.
>
> AIPS does not really have a good method for this.  You can make images 
> of the source and of the spectral index with SPIXR.  Then you can 
> divide the model into the data and solve for gains with OOCAL (a 
> procedure). This has not been a well-tested route however.  Separating 
> the data by spectral window (IF) and using separate models and 
> separate self-cals is certain to work.  If the source varies by this 
> much I am not sure that you can put the IFs back together - SPIXR 
> might help represent the multiple IFs in only 2 images however.
>
> OBIT and CASA both have more elaborate methods to handle this issue.
> Whether they work well I cannot say.
>
> Eric Greisen
>
>