[daip] CAR

[Eric Greisen]

Lawrence Rudnick wrote:
>   Eric -- revisiting an old problem that you may not want to hear about 
> again - CAR coordinate system.  We are entering into a significant 
> project using the GALFACTS survey, which is being produced in CAR 
> (apparently with a header now compatible with new FITS CAR standard).  
> Our goal is to subtract NVSS from GALFACTS, to look for residual diffuse 
> emission.  We have done this successfully with GBT data, creating our 
> own SIN maps from GBT scans.  But we won't be able to do it at least in 
> AIPS with GALFACTS, unless there's a CAR capability in OHGEO.  Taking 
> the NVSS source lists for subtraction is not adequate.  With the GBT we 
> were able to get down to about 2% residuals, mostly due to vagaries of 
> the GBT effective beam shape (given our scanning pattern, etc).  Any 
> prospects for CAR?

A full installation of -CAR seems unlikely since the issues can get very 
complex.  A partial installation on the other hand might fly.

Can you run PRTTP with PRTLEV=1 on some representative files or perhaps 
even send me one?

BTW - I have spent the last 2 weeks or so on XGAUS trying to make it 
into a very general Gaussian spectral fitting task so that it may serve 
as a platform to do RM fitting.  I am still waiting for an answer from 
you about the possible task....

Eric Greisen