Arp 300 is in the Double Galaxies class. The Atlas note says "note elongated
feature pointing toward nucleus of larger spiral". I'm not sure what
feature Dr. Arp meant, as I can't see one in either my image or the Atlas image.
There is a very narrow edge-on galaxy just SE of the larger spiral, pointing at
the nucleus, but I would not expect that to be described as a "feature".
Possibly he was referring to the dark band seen on both sides of the nucleus.
Also, notice the double nucleus of the companion galaxy and the multiple faint
arms or streamers exiting the N side of the primary..
|10-inch Newtonian, StarlightXpress MX716, 55 minutes|