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We look for simulated star-forming linear wakes such as the one recentlydiscovered by van Dokkum et al. (2023) in the cosmological hydrodynamicalsimulation ASTRID. Amongst the runaway black holes in ASTRID, none are able toproduce clear star-forming wakes. Meanwhile, fly-by encounters, typicallyinvolving a compact galaxy (with a central black hole) and a star-forminggalaxy (with a duo of black holes) reproduce remarkably well many of the keyproperties (its length and linearity; recent star formation, etc.) of theobserved star-forming linear feature. We predict the feature to persist forapproximately 100 Myr in such a system and hence constitute a rare event. Thefeature contains a partly stripped galaxy (with $M_{\rm gal}=10^9 \sim10^{10}M_\odot$) and a dual BH system ($M_{\rm BH}=10^5 \sim 10^7\,M_\odot$) inits brightest knot. X-ray emission from AGN in the knot should be detectable insuch systems. After $100\sim 200\,{\rm Myrs}$ from the first fly-by, thegalaxies merge leaving behind a triple black hole system in a (still) activelystar-forming early-type remnant of mass $\sim 5\times 10^{10}\,M_\odot$.Follow-up JWST observations may be key for revealing the nature of these linearfeatures by potentially detecting the older stellar populations constitutingthe bright knot. Confirmation of such detections may therefore helpdiscriminate a fly-by encounter from a massive BH wake to reveal the origin ofsuch features.

Fly-by galaxy encounters with multiple black holes produce star-forming linear wakes