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Re: Coadd images that contain no stars [message #80330 is a reply to message #80329] Sun, 27 May 2012 08:05 Go to previous message
Russell Ryan is currently offline  Russell Ryan
Messages: 122
Registered: May 2012
Senior Member
On May 27, 10:56 am, spasoklampa...@yahoo.com wrote:
>      Hi,
>
>    I have two images from GALEX from a molecular cloud, that need to
> be combined to create an image. The problem is that there are no stars
> present. There is only the nebula. How is it possible to coadd these
> two frames? On each image half of the cloud is present and there is
> some overlap of course. Is there a way in IDL?
>
>     Thanks a lot

Why cant you just add them? I'm confused....

Do you need to align the images? If so, then you need to correlate
the two images to find the appropriate shifts. Even then, and I know
how careful you need to be, the GALEX PSF varies across the FoV
significantly. So coadding frames of anything can be very tricky if
they're not centered on precisely the same position in the sky.

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