[sjastro]

Thanks David and Geoff.

I have never seen the halo extend deeply in any other amateur or professional image in the visible spectrum.
The pros image the halo in radio, UV and X-ray wavelengths.
One needs to be certain the halo is the real deal rather than a processing artefact.

I've sent the image to the European Southern Observatory for comment.
Given their involvement in the Carina Dwarf galaxy thread, hopefully they will resolve the issue.

Regards

Steven