[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
More information about the Daip
mailing list