Object name: NGC5943

Designation(s): NGC5943, NGC5934, NGC5935, NGC5945, NGC5947,

This field contains 4 NGC galaxies, all either interacting or distorted by past interactions plus a 5th rather normal one. The field is located in northeastern Bootes. All are likely members of the same local group about a quarter billion light-years distant by redshift measurement. One or two \"lesser\" members of the group are in the field as well.

NGC 5934 and NGC 5935 are an obvious pair of interacting galaxies. Both have plumes drawn out of them by the interaction. NGC 5934 is listed as a spiral of questionable classification. NGC 5935 is listed as S? as well by the NGC Project but NED leaves off the question mark. To me, they both look odd. I wouldn\'t argue with NGC 5935 being S0 but 5934 looks unquestionably spiral to me. Maybe they mean they can\'t decide what type of spiral it is, barred or not barred. Below the pair is KISSR 1955 a starburst galaxy with a faint outer halo. Starburst activity can be triggered by interaction with another galaxy but this isn\'t necessary.

NGC 5945 is a nice face on barred spiral whose arms overlap making a pseudo-ring. Besides these rings, there are two outer arm segments that see to make huge \"ears\" on the east and west sides of the galaxy. Inside the ring on the west side is a \"bright\" object listed as SDSS J152943.21+425511.2, a star and [BFW2006] J232.42996+42.91977 a galaxy. So is it a star or a galaxy. Its distance measurement is about the same as NGC 5945 but it is a friend of a friend estimate rather than spectroscopically determined. So is it a star or a galaxy? Of NED\'s 5 entries for this object 4 call it a galaxy. While it is hard to measure the PSF of an object on top of another what I am seeing is identical to a star of similar magnitude in the image. That would indicate it is quite small in angular size, more like a star than a galaxy but if this is all that\'s left of the core of a cannibalized galaxy. That might explain the \"ears\".

The main target of my interest in taking this field, however, is NGC 5943. This galaxy is very fuzzy with large plumes. I didn\'t realize how large when I took this image or I\'d have put a lot more time into it (weather willing which likely would not have allowed it). Faintly seen in my image are two huge plumes going to the northwest and southeast. It too has a near starlike companion, ASK 245539.0. Though its PSF is very galaxy like so easy to confirm it is a galaxy. Usually, plumes like those seen in 5943 are due to a merger. In this case, it might be that the companion is still in the process of merging. Note the brightest part of the plume leads nearly to ASK 245539.0. Unfortunately, I find no papers on either NGC 5943 or NGC 5945.

The ordinary looking NGC galaxy, NGC 5947 is a rather pretty face on barred spiral with many arm segments. I didn\'t think about it when picking the center coordinates for the image as I was thinking only of the other 4. This resulted in it being chopped off on the eastern side. The other nice spiral in the image is CGCG 222-012. Smaller than NGC 5947 and tilted at a rather steep angle it is difficult to see its structure. While no bar is seen nor is it classified as a barred spiral the arms I see seem to start well out from the core as if coming from the ends of an unseen bar. It too appears to be a member of the same group as the others. Several more are out of the field.

NGC 4934, NGC 4935 and NGC 4945 were discovered by Édouard Stephan on June 12, 1880. He found NGC 4943 and NGC 5947 on June 18, 1880.

Unfortunately, seeing was very poor for this image. There\'s a lot of fine detail in all of these galaxies I failed to pick up due to the seeing. I hope to try again for it if the weather ever permits. This isn\'t representative of the field I\'m sorry to say.

14\" LX200R @ f/10, L=4x10\' RGB=2x10\', STL-11000XM, Paramount ME