Merged galaxy

http://legacysurvey.org/viewer?ra=149.0915&dec=0.8421&zoom=13&layer=decals-dr7

This galaxy has an extended diffuse “halo” with an abrupt outer edge, which I presume is the result of a past merger that is now complete?

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Yeah, these shells or umbrellas happen fairly often when a small galaxy is tidally disrupted as it merges.

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