NGC 3628 (Hamburger Galaxy) is the largest of the Leo Triplet galaxies at approximately 35 million light years distance. The image also shows the beginning of its 300000 light year long tidal tail visible in this image taken mostly at SQM 21.7. The full Leo Triplet with the full length of the tidal tail visible is shown in the image at the link above from which this image was cropped. At the end of the tidal tail in that image, there is a vertically-oriented feature that is a tidal dwarf galaxy (TDG) that was discovered by Nikiel-Wrocynski et al. in 2014 which was only a few months before this image was taken in April 2015. The Leo TDG is the closest TDG known to the Milky Way and was formed from the tidal debris left by past galaxy interactions in the Triplet.
Version C: NGC 3628 and the full tidal stream with the Leo TDG at the end of the stream.
An inverted crop of the Triplet image at the above link is compared with that from the Leo TDG discovery paper at:
https://www.flickr.com/photos/9906726@N08/22099420160/in/album-72157615214859916/8.7 hr LRGB
D.A.R.C. Observatory, Mercey Hot Springs, CA. 4/12/15, 4/18/15
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