Arp 249 is in the class Appearance of Fission. The Atlas note says
"straight connection from faint material on E to middle galaxy". My image
shows that easily, and also the jet or plume pointing SW from the S galaxy.
These are both easily seen in the Atlas image, but my image (especially
the 2x detail) also shows a jet of material exiting the southern
nucleus perpendicular to the line of connection that cannot be seen in
the Atlas image. It is, however, easily visible in 48-inch Palomar Schmidt images taken in
1959 and 1994. I suspect it was just the choice of processing that left it
out of the 200-inch Atlas image.
The entire group (two or three galaxies, depending on the cataloger) is cataloged as UGC 12891. There was some rotation between my 2005 and 2007 images. I did not crop off all of the misaligned edges because I wanted to leave the KUG 2357+228 galaxy in the field, right at the N edge. The misalignment shows up more in the negative image.
|10-inch Newtonian, StarlightXpress MX716, 59 minutes|