[AstroPy] Image reprojection and counts

Ivan Valtchanov ivvv68 at gmail.com
Fri Jan 8 03:58:17 EST 2021

Hi Dominik,

I would suggest you to do generate some toy models and test the
behaviour. You can generate images with e.g. Gaussian clusters and
then reproject and check the counts after reprojection. Additionally
you could also check the radial profile, just to be sure the
reprojection does not introduce any undesired side effects. Just an

Ivan V

On Thu, 7 Jan 2021 at 19:34, Dominik Rhiem <hg.dude.hg at gmail.com> wrote:
> Dear all,
> I am planning to use the reproject_interp function to rescale several fits images of different clusters in such a way that after the reprojection, the maps have the same number of pixels and the same size in terms of R500/Theta500 for the specific cluster; this means that the pixel size in arcsec will depend on the cluster after the rescaling.
> However, the flux information contained in the maps is scaled by the pixel size; before the rescaling, each pixel contains counts with the units mJy per pixel area [arcsec**2]. Does the function reproject_interp take this into account or should I multiply the maps with the pixel area before rescaling?
> If anything about this is unclear, please let me know.
> Sincerely,
> Dominik Rhiem
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