[daip] Help

[Eric Greisen]

V Venkataraman writes:
 > Dear Sir,
 > 
 > I have the radio map of a starforming region which i got after flagging 
 > and running CALIB, CLCAL and then IMAGR task in AIPS. I have not yet done 
 > the self calibration. Now can i believe the flux value at this stage and 
 > use it for the calculation of the physical parameters or should i do self 
 > calibration and then use the flux values. The structures of my source 
 > almost matches with the NVSS map at this stage. Kindly guide me.
 > 

Self-cal will use the current flux if you do A&P.  If you do solely a
P (phase) self-cal, then sources may become smaller in diameter as the
phases become better aligned.  Therefor their brightness will change,
but their total (integrated) flux probably will not.

Eric Greisen