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convert the spectral axis of a FITS file from frequency to velocity #37

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SpheMakh opened this issue Feb 22, 2018 · 1 comment

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SpheMakh commented Feb 22, 2018

Can we have a little Fitstool mode to convert the spectral axis of a FITS file from frequency to velocity?

At this stage I would like something simple, which assumes no reference frame transformation is required and goes simply from FREQ to VRAD with:

VRAD = c * ( 1-FREQ / RESTFREQ)

The value of RESTFREQ can be taken from the header itself. If it's not there we can add it with Fitstool's edit-header.

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Convert FITS header from Frequency to Velocity caracal-pipeline/caracal#181

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SpheMakh commented Feb 22, 2018

originally raised here caracal-pipeline/caracal#181

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