imcontsub – Estimates and subtracts continuum emission from an image cube – analysis, imaging task

Description

Estimates and subtracts continuum emission from an image cube

For each direction pixel (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.

Parameters

Title

Parameter	Default	Description
imagename	''	Name of the input spectral line image
linefile	''	Output continuum-subtracted image file name
contfile	''	Output continuum image file name
fitorder	int(0)	Polynomial order for the continuum estimation
region	''	Region selection.
box	''	Rectangular region to select in direction plane. Default is to use the entire direction plane.
chans	''	Channels to use.
stokes	''	Stokes planes to use.

Parameter Explanations

imagename

''

Input image cube.

Default: none

Example: imagename=’ngc5921_task.im’

linefile

''

Name of continuum-subtracted 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

int(0)

Polynomial order for the continuum estimation

Default: 0

Example: fitorder=2

region

''

Region selection.

Default: ‘’ (use the full image)

box

''

Rectangular region to select in direction plane.

Default: ‘’ (use the entire direction plane)

chans

''

Channels to use.

Default: ‘’ (use all channels)

stokes

''

Stokes planes to use.

Default: ‘’ (use all Stokes planes)