[daip] [!15417]: AIPS - Regarding the ZAMAN task

[Eric Greisen]

Eric Greisen updated #15417
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       Staff (Owner): Eric Greisen (was: -- Unassigned --)

Regarding the ZAMAN task
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           Ticket ID: 15417
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/15417
                Name: Atanu Koley
       Email address: atanuphysics15 at gmail.com
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 12 January 2020 12:33 PM
             Updated: 13 January 2020 11:33 AM
           Reply due: 14 January 2020 05:00 PM (1d 5h 27m)
      Resolution due: 07 October 2022 05:00 PM (998d 5h 27m)

The task ZAMAN is meant to work with AGAUS for deep absorption line
images.  Similarly, ZEMAN works with XGAUS for emission and weaker absorption
line experiments.  You run XGAUS or AGAUS first to fit Gaussians to the
components of The Ipol image and then run ZEMAN or ZAMAN giving it the
Ipol Gaussian model.  In this way, the Zeeman fitting works on the 2 components
properly, dealing with an S-curve merging that might occur.  It has been found to
work well - finding splittings of merged components that had been measured by
traditional means with higher-spatial resolution images.  It sometime reveals that
one of the components is Zeeman split while the other is not (at the current S/N).
You really should study AIPS Memos 118 and 122 before trying these tasks.
They are available from the web www.aips.nrao.edu.
Eric Greisen



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