AAS 203rd Meeting, January 2004
Session 40 Observations and Instrumentation: Non-Optical
Poster, Tuesday, January 6, 2004, 9:20am-6:30pm, Grand Hall

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[40.03] Implementing the Grasp~8 Full-Polarization model beam into AIPS++

C.R. Clearfield (Harvard University/NRAO), W.F. Brisken, T.J. Cornwell, A. Kemball, R.A. Perley (NRAO)

Because of the increased sensitivity that the EVLA will provide, detailed, full-polarization models of the VLA beam will be necessary in order to do high-fidelity, noise-limited observations of all four Stokes parameters. We incorporate into AIPS++ full-polarization model corrections of the VLA beam patterns. These model corrections are generated from the antenna simulation program Grasp8.

We then apply these corrections to observations of 3C286 at two pointings: on axis and at the half-power point. Although parallel hands (Stokes~I, V) model well, we find that the the cross-handed data (Stokes~Q, U) are not stable enough on-axis to allow us sufficient confidence in our off-axis results. Nevertheless, we compare the observations with our predictions.

The author(s) of this abstract have provided an email address for comments about the abstract: clearf@fas.harvard.edu

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.