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Basic Information on restor
Purpose: Restore clean components to make the CLEAN map
RESTOR is a MIRIAD task that 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
The model of the deconvolved cube, typically produced by CLEAN
or MAXEN. The units of this image should be Jy/pixel.
The input dirty beam. No default.
The input dirty cube which should have units of Jy/beam. May be
omitted when mode=convolve. Otherwise, no default.
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
"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 beam is needed only if the Gaussian fwhm and
pa is not specified. The map is ignored.
"dirty" The output is the map convolved with the beam.
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.
The position angle, in degrees, of the Gaussian restoring beam,
measured east from north. Ignored if no value is given for
FWHM. The default is determined from the dirty beam fit.
There is only a single option at present:
"mfs" If the input model was produced by mfclean and contains
a 2nd plane with alpha*I components, using "mfs" will
cause restor to write a second plane in the output image
containing the alpha*I model convolved with the
Gaussian beam. Linmos will use this plane to do
wideband primary beam correction if the bw parameter
The output restored image. No default.
Revision: 1.9, 2013/02/15 00:20:59 UTC
Generated by email@example.com on 15 Feb 2013