Interesting object

https://www.legacysurvey.org//viewer/?ra=136.4622&dec=1.1348&layer=hsc-dr2&zoom=15&const

I wonder what causes this weird distended mushroom shape. It is something I have seen in bow shock but not like this. Anyone know?

Another example:

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Tidal interactions leading to destruction of a smaller galaxy. eg umbrella galaxy APOD: 2022 February 7 - NGC 4651: The Umbrella Galaxy

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Thank you very much - very interesting

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And shell galaxies in general I suppose;

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