Another interesting galaxy which is not imaged too often but presents a really interesting looking interaction between it and NGC1531, which is the smaller galaxy slightly above the main attraction. It looks like the plain of the arms is being pulled apart by the interaction/merger.
Also of interest is the multitude of smaller galaxies in the back ground. I lost count of the small ones, they appear almost every where.
This image has about 9 hours of Ha integrated into it but there only appears to be a few small blobs of Ha detectible in one of the arms. Total integration is 36.6 hours.
Click here for larger image.