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I don't know either, and would also be very surprised if they fabricated an image - but synthesising an image from real data to illustrate what they have observed is something different. Or maybe they just used a Bayer camera.
Whatever, angular resolution is primarily determined by aperture and/or seeing. Adding a Barlow only changes the image scale and, provided the sampling is right, it does not change the resolution for DSO imaging (if it was possible where would you stop - maybe a stack of 5x Barlows could get Hubble-like results and there would be no point in big scopes or AO)
I guess it would be interesting for someone to try it out.
Last edited by Shiraz; 28-03-2017 at 10:17 PM.
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