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NRAO Home > CASA > CASA Task Reference Manual |
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0.1.37 imcontsub
Requires:
Synopsis
Estimates and subtracts continuum emission from an image cube
Arguments
Inputs |
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imagename |
| Name of the input spectral line image
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| allowed: | string |
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| Default: |
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linefile |
| Output continuum-subtracted image file name
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| allowed: | string |
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| Default: |
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contfile |
| Output continuum image file name
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| allowed: | string |
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| Default: |
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fitorder |
| Polynomial order for the continuum estimation
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| allowed: | int | |
| Default: | 0 |
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region |
| Region selection. Default is to use the full image.
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| allowed: | string |
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| Default: |
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box |
| Rectangular region to select in direction plane. Default
is to use the entire direction plane.
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| allowed: | any |
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| Default: | variant
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chans |
| Channels to use for fitting. Default is to use all channels.
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| allowed: | string |
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| Default: |
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stokes |
| Stokes planes to use. Default is to use all Stokes planes.
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| allowed: | string |
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| Default: |
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void
Example
For each (x, y) column in imagename (or a subset selected by region and/or
box), this estimates the continuum by fitting a polynomial to one or more
subsets of the channels. The continuum estimate is saved in contfile, and
subtracted from imagename (or its subset) to make a spectral line estimate,
which is saved in linefile.
Keyword arguments:
imagename -- Input image cube
Default: none; Example: imagename=’ngc5921_task.im’
linefile -- Name of output spectral line cube
Default: none; Example: outline=’ngc5921_line.im’
contfile -- Name of output continuum cube
Default: none; Example: contfile=’ngc5921_cont.im’
fitorder -- Polynomial order for the continuum estimation.
Default: 0; Example fitorder=2
region -- Region selection. Default is
to use the full image.
box -- Rectangular region to select in direction plane.
for details. Default is to use the entire direction plane.
chans -- Channels to use for fitting.
Default is to use all channels.
Example: chans=’3~6;>40’
stokes -- Stokes planes to use. Default is
to use all Stokes planes.
Fit a second order polynomial (fitorder=2) to channels 3-8 and 54-60
to an RA x Dec x Frequency x Stokes cube, selecting the Stokes I plane
ch = ’3~8, 54~60’
imcontsub(imagename="myimage.im", linefile="mycontsub.im", fitorder=2, chans=ch, fitorder=2, stokes="I")
More information about CASA may be found at the
CASA web page
Copyright © 2016 Associated Universities Inc., Washington, D.C.
This code is available under the terms of the GNU General Public Lincense
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