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0.1.37 imcontsub

Requires:

Synopsis
Estimates and subtracts continuum emission from an image cube

Arguments





Inputs

imagename

Name of the input spectral line image

allowed:

string

Default:

linefile

Output continuum-subtracted image file name

allowed:

string

Default:

contfile

Output continuum image file name

allowed:

string

Default:

fitorder

Polynomial order for the continuum estimation

allowed:

int

Default:

0

region

Region selection. See ”help par.region” for details. Default is to use the full image.

allowed:

string

Default:

box

Rectangular region to select in direction plane. See ”help par.box” for details. Default is to use the entire direction plane.

allowed:

any

Default:

variant

chans

Channels to use for fitting. See ”help par.chans” for details. Default is to use all channels.

allowed:

string

Default:

stokes

Stokes planes to use. See ”help par.stokes” for details. Default is to use all Stokes planes.

allowed:

string

Default:

Returns
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. See "help par.region" for details. Default is  
            to use the full image.  
  box --  Rectangular region to select in direction plane. See "help par.box"  
          for details. Default is to use the entire direction plane.  
  chans -- Channels to use for fitting. See "help par.chans" for details.  
           Default is to use all channels.  
           Example: chans=’3~6;>40’  
  stokes -- Stokes planes to use. See "help par.stokes" for details. 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")  
 


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