Confused reference

https://www.legacysurvey.org//viewer/?ra=268.9813&dec=67.3347&layer=ls-dr9&zoom=15

This is what I had referred to. What causes this? feels post merger but am intrigued

Yep, that looks like classic merger debris to me. eg see the figures on page 19 here [1003.4860] Stellar Tidal Streams in Spiral Galaxies of the Local Volume: A Pilot Survey with Modest Aperture Telescopes

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amazing thanks