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very interesting Robert.
Most hi res images of NGC253 show indistinct darker filaments/columns rising from around the central zone, as in the attached image. This is just broadband luminance (I did not take any Ha at the time), but I think the filaments are still reasonably easy to see. The paper you referenced indicated that such features are well known in other galaxies and at other wavelengths, so could they be consistent with a cold gas outflow in NGC253 - they even seem to be in about the right place. What do you think?
Regards Ray
Last edited by Shiraz; 13-10-2013 at 11:29 PM.
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