[AstroPy] Question regarding WCS coordinates

Paul Kuin npkuin at gmail.com
Wed Jul 3 15:07:12 EDT 2013

First align the center, then get the scale in there (from kpc to degrees),
possibly you need to roll the image. Look up the FITS standards office
which has the papers describing fits and how to put WCS parameters in it.


On Wed, Jul 3, 2013 at 7:36 PM, John ZuHone <jzuhone at gmail.com> wrote:

> Hi all,
> This question is probably more about WCS than it is about Astropy, but I
> intend to use Astropy to do it so I thought I would ask.
> I have some projected maps of gas temperature of a galaxy cluster that I
> made from FLASH simulation data using yt that I have put into FITS files. I
> also have some simulated Chandra event files made from the MARX Chandra
> simulator, of the same system.
> I would like to match the WCS coordinates of the two files. The simulated
> events file already has WCS coordinates in RA and DEC, and this is the
> coordinate system I would like to use for the temperature map. The
> information I have for the temperature map is the cell spacing in kpc, and
> the redshift of the simulated cluster, so with the chosen cosmology I also
> have the distance.
> How can I go about this? Sorry, I realize this is a bit involved (at least
> it seems that way to me).
> Best,
> John ZuHone
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Dr. N.P.M. Kuin      (n.kuin at ucl.ac.uk)
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