Description

Changes the spectral reference frame of an image (cube).

The spectral values assigned to an object depend on the spectral reference frame. This task can change the frame in which the image reports its spectral values.

 

Parameter descriptions

imagename

Name of the input image.

output

Name of the output image. Default (no output) is to modify the input image.

outframe

Spectral frame in which the frequency or velocity values will be reported by default. See Spectral Frames for more information on the frame definitions. 

Abbreviation Definition
lsrk local standard of rest (kinematic) - default
lsrd local standard of rest (dynamic)
bary barycentric
geo geocentric
topo topocentric
galacto galactocentric
lgroup local group
cmb Cosmic Microwave Background dipole

epoch

Epoch to be associated with this image (only with outframe='geo' or 'topo'). For example: '2000/12/25/18:30:00.10'.

restfreq

Rest-frequency to use for velocity value. For example: restfreq='1.420405752GHz' for the HI 21cm line of neutral hydrogen. The default is to use the rest-frequency already present in the input image.