[daip] Fwd: UVfits {External}

[Farhad Zadeh]

Yes. The plot shows how Q and U varies with time for a variable source (Sgr A*) since DFTPL has the list of  IQUV as a function of time.  The plot is similar to FRPA in DFTPL.
I have to check what DFTIM is! Never used it.

Thanks,
Farhad


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From: Eric Greisen <egreisen at nrao.edu>
Date: Tuesday, August 26, 2025 at 11:21 AM
To: Farhad Zadeh <zadeh at northwestern.edu>
Cc: daip <daip at nrao.edu>
Subject: Re: Fwd: UVfits {External}
DFTPL and DFTIM use time as one of the fundamental axes.  What you are asking for seems to be a histogram image with Q and U amplitudes as the two axes.  Is that right?  The task UVHIM would be a place where that could be inserted.

Eric
________________________________
From: Farhad Zadeh <zadeh at northwestern.edu>
Sent: Tuesday, August 26, 2025 8:18 AM
To: Eric Greisen <egreisen at nrao.edu>
Cc: daip <daip at nrao.edu>
Subject: Re: Fwd: UVfits {External}


Hi Eric,

I hope all  is well with you. I have not bugged you for a long time. I still use aips. I like the way you included FPA in DFTPL, which is very useful.

One other useful plot that many people use and model is  a plot showing Q vs U which generally creates clockwise or counterclockwise patterns.

Is it possible to consider this it in DFTPL?  Perhaps you have a different task for this.



Many thanks.

Cheers,

Farhad







From: egreisen <egreisen at nrao.edu>
Date: Monday, March 8, 2021 at 4:40 PM
To: Farhad Yusef-Zadeh <zadeh at northwestern.edu>
Cc: daip at nrao.edu <daip at nrao.edu>
Subject: Re: Fwd: UVfits

On 2021-03-08 15:23, Farhad Zadeh wrote:
> Hi Eric,
>
> Here are the IMH files for the FITLD and UVLOD that Joe created. He
> is  really not known  if there's a header-type file he  could  get
> from the CASA data. He thinks the best bet would be the PRTTP file
> that he sent yesterday since that contains all of the header
> information anyway.

The issue is whether CASA applies flags and calibration when doing
exportuvfits.  The BUNIT keyword suggests that it does not.  AIPS will
not be able to process these data correctly unless they are calibrated
either by CASA or by AIPS.

Eric
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