Long wave UV imaging of galaxies is tedious due to the very long exposures required to get a good S/N ratio.
I have estimated a 70 hr exposure in UV will have a similar S/N ratio to a standard 1.5 luminance image for Centaurus A.
Rather than spending the rest of my life imaging Centaurus A I took a short cut by doing a 10 hr exposure and using this as a B channel image with existing L, R and G data.
A comparison between a conventional and UV image of Centaurus A is in the attachment with the standard image on the left.
A higher resolution UV image is found here.
http://members.iinet.net.au/~sjastro/ngc5128UV.html
A higher resolution image of Centaurus A in visible light is here.
http://members.iinet.net.au/~sjastro/ngc5128nnc.html
Clear skies
Steven