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restor

Section: User Commands (1)
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NAME

restor - Restore clean components to make the CLEAN map  

PERSON RESPONSIBLE

rjs  

CATEGORIES

deconvolution  

DESCRIPTION

RESTOR is a MIRIAD task which performs a number of functions typically performed after the deconvolution step. These include generating a "CLEAN" map, calculating residuals and convolving a model by a gaussian beam.

RESTOR can also handle multi-frequency synthesis data. In this case the input dirty map should consist of just one plane. The input beam may contain several planes, and the input model may have no more planes (but possibly fewer) than the beam. To get the residuals, each plane in the model is convolved with the corresponding plane in the beam, and subtracted from the dirty map.  

PARAMETERS

model
The model of the deconvolved cube. Usually this will be produced by CLEAN or MAXEN. The units of this image should be Jy/pixel. No default.
beam
The input dirty beam. No default.
map
The input dirty cube, which should have units of Jy/beam. This can be omitted when mode=convolve. Otherwise no default.
mode
This can be one of the values:
  "clean"     This is the normal use, and the default, where the
              output is the map, less the model convolved by the
              dirty beam, plus the model convolved by the gaussian
  "residual"  The output is the map, less the model convolved by the
              dirty beam.
  "convolve"  The output is the model convolved by the gaussian. The
              map parameter is ignored, and the beam is needed only if
              the user does not give the gaussian fwhm and pa.
  "dirty"     The output is the map convolved with the beam.
fwhm
The size, in arcsec, of the gaussian beam to use in the restoration. This will normally be two numbers, giving the full-width at half-maximum of the major and minor axes of the gaussian. If only one number is given, the gaussian will have equal major and minor axes. If no values are given, they are either retrieved from the beam header, or computed by fitting a gaussian to the given dirty beam.

Note that the model image is convolved with this gaussian beam, and then added to the residuals. These residuals are not affected by the choice of this gaussian beam size. So if you want the residuals and convolved image to have approximately the same beam size, then the gaussian beam size chosen should be the same size as the dirty beam. If you want coarser resolution than that provided by this, you should use task CONVOL to smooth the restored image afterwards.

pa
The position angle, in degrees, of the gaussian restoring beam, measured east from north. The default is determined from the dirty beam fit (The value for PA is ignored, if no value is given for FWHM).
out
The output restored image. No default.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

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