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We present the first analysis of the stellar content of the structures andsubstructures identified in the peculiar star-forming galaxy NGC5474, based onHubble Space Telescope resolved photometry from the LEGUS survey. NGC5474 is asatellite of the giant spiral M101, and is known to have a prominent bulge thatis significantly off-set from the kinematic center of the underlying HI andstellar disc. The youngest stars (age~ 100 Myr) trace a flocculent spiralpattern extending out to ~8 kpc from the center of the galaxy. On the otherhand intermediate-age (age > 500 Myr) and old (age > 2 Gyr) stars dominate theoff-centred bulge and a large substructure residing in the South Western partof the disc and not correlated with the spiral arms (SW over-density). The oldage of the stars in the SW over-density suggests that this may be anothersignature of the dynamical interaction/s that have shaped this anomalousgalaxy. We suggest that a fly by with M101, generally invoked as the origin ofthe anomalies, may not be sufficient to explain all the observations. A morelocal and more recent interaction may help to put all the pieces of thisgalactic puzzle together.

The strange case of the peculiar spiral galaxy NGC5474. New pieces of a galactic puzzle