[daip] [!4839]: aips - Source Flux Density in AIPS

[Eric Greisen]

Eric Greisen updated #4839
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       Staff (Owner): Eric Greisen (was: -- Unassigned --)
                 Due: - Cleared - (was: 29 April 2014 04:19 PM)

Source Flux Density in AIPS
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           Ticket ID: 4839
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/4839
           Full Name: Chris De Pree
               Email: cdepree at agnesscott.edu
             Creator: User
          Department: AIPS Data Processing
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 25 April 2014 04:19 PM
             Updated: 25 April 2014 04:47 PM
      Resolution Due: 05 May 2014 04:19 PM (9d 23h 31m)



My first guess is that phase transfer between calibrator and target
has not been sufficient to deal with atmospheric fluctuations.  Does
your target have enough flux for phase only self-cal?   That will be
the "cure" for this.

Plotting the phase of a baseline versus time of the target would
give you some idea of phase coherence.  Also try imaging the
calibrator sources to see what their images yield for flux (expected
one hopes) and structure (little or none one hopes).  Plotting the
phases in the CL table with SNPLT (select only calibrators) will
give an idea of how coherent the calibration is.  If the SN table from
CALIB is still around, try it.  There is a task that will flag bits of data
for when the calibration is too jumpy (on a baseline basis since
two antennas may be jumpy but together so that the cal on that
baseline anyway is likely to be okay).

Good Luck

Eric




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