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offaxis

Section: User Commands (1)
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NAME

offaxis - Remove (or simulate) ATCA off-axis instrumental polarisation.  

PERSON RESPONSIBLE

rjs  

CATEGORIES

uv analysis  

DESCRIPTION

OFFAXIS is a Miriad task which attempts to remove off-axis instrumental polarisation from ATCA observations. As input, OFFAXIS takes a visibility dataset and a model of the source total intensity (Stokes I). Given this, it computes the expected off-axis effects (given its internal models of the effects), subtracts this from the data, and produces an output (nominally) corrected dataset.  

PARAMETERS

vis
Input visibility dataset. No default.
select
Normal visibility selection parameter. The default is to select all data. See the help on "select" for more information.
line
Normal line parameter with the normal defaults. See the help on "line" for more information.
stokes
Stokes/polarisations to be processed. The default is XX,YY,XY,YX. The only other legitimate value is I.
model
Input model of the total intensity image. No default. This should be the apparent total intensity (i.e. not corrected for primary beam attenuation) in Jy/pixel
out
The name of the output, corrected, visibility dataset. No default.
clip
Pixels in the model less (in absolute value) than the clip level are treated as if they are 0. The default is 0.
options
Task enrichment parameters. Several can be given, separated by commas. Only the minimum number of characters to guarantee uniqueness are needed. Possible options are:
  replace   Normally OFFAXIS subtracts the computed off-axis
            response from the data. This option causes the
            visibility to be replaced with the model.
  nocal     Do not apply any antenna gain calibration. The default
            is to apply these if they are available.
  nopol     Do not apply any polarization leakage correction. The
            default is to apply these if they are available.
  nopass    Do not apply bandpass calibration. The default is to
            apply these calibrations if they are available.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

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Time: 18:35:38 GMT, July 05, 2011