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ASTRO: Arp 309



 
 
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Old December 15th 11, 08:30 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Arp 309

Arp 309 is made up of two interacting galaxies, NGC 942 (lower) and NGC
943 (upper). The pair is located in Cetus about 200 million light-years
distant. They are the largest two of a group of galaxies known as the
USGC S088 group. NED lists it as having 8 members. While they are not
identified there are 8 galaxies with known redshift values which
indicate they are at the same distance as Arp 309. Since no other
galaxies in my field have redshift values I've not labeled any but those
probably in the group.

Arp put #309 in his class for double galaxies. Arp apparently missed or
wasn't interested in the large plume going north from NGC 943 or the
smaller one going south from NG 942. His only comment addresses the
very red dust ring in NGC 943 when he says: "Peculiar absorption ring,
possibly broken."

Arp's image
http://ned.ipac.caltech.edu/level5/A...ig_arp309.jpeg

14" LX200R @ f/10, L=4x10' RGB=2x10'x3, STL-11000XM, Paramount ME

Rick
--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

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