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NGC 3718 and NGC 3729 galaxies in Ursa Major

auteur: A.Block/University of Arizona/Novapix

référence: a-gax37-18002

Image Size 300 DPI: 29 * 24 cm

NGC 3718 and its companion NGC 3729 (left) are physically related members of the Ursa Major galaxy cluster. The two galaxies appear to orbit each other at a projected separation of 147,000 light years. NGC 3718 contains an active galactic nucleus (AGN) and is known as a Seyfert type 1.9 galaxy. Its strange shape is probably due to a gravitational interaction with its companion NGC 3729. A grouping of 5 background galaxies 300 million light years distant are projected to the south of NGC 3718 and are designated Arp 322 (also Hickson 56). Several members of the group appear to be a strongly interacting.

Keywords for this photo:

ACTIVE GALAXY NUCLEUS - AGN - ARP 322 - ASTRONOMY - GALAXY - GROUP - INTERACTING - NGC 3718 - NGC 3729 - PECULIAR GALAXY - SEYFERT GALAXY - STAR - URSA MAJOR -