[daip] Questions about AIPS Tasks

Eric Greisen egreisen at nrao.edu
Wed Jan 14 10:13:05 EST 2004


Christian Leipski writes:

 > Using subarray = 0 (=>all):
 > 
 > IMAGR1: GR3DUV: Max U Baseline      595399. lambda (=  297 cells)
 > IMAGR1: Field   1 fit FWHM =    1.516 x    1.323      arcsec, PA=   -9.5
 > 
 > All visibilities, long baselines, but small beam

                                         large
 > 
 > 
 > Using subarray = 1 (A-Array data):
 > 
 > IMAGR1: GR3DUV: Max U Baseline      595399. lambda (=  297 cells)
 > IMAGR1: Field   1 fit FWHM =  561.087 x  454.141 Milliarcsec,PA=   37.9
 > 
 > Using subarray = 2 (B-Array data):
 > 
 > IMAGR1: GR3DUV: Max U Baseline      180928. lambda (=   91 cells)
 > IMAGR1: Field   1 fit FWHM =    1.572 x    1.359      arcsec,PA=  -11.2
 > 
 > You can see that if subarray is set to 0, IMAGR finds all visibilities AND
 > a maximum (U) baseline length corresponding to the A-Array data, but
 > restores a B-Array beam.....
 > 
 > What else should I check?

         What are the other adverbs?  If you are doing NA weighting
the short spacings may well dominate.  You should look at the beam
images produced - perhaps with SLICE - to see what they look like.

Eric Greisen



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