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Using the MegaCam imager on the Canada-France-Hawaii Telescope, we haveresolved individual stars in the outskirts of the nearby large spiral galaxyM81 (NGC 3031) well below the tip of the red giant branch of metal-poor stellarpopulations over 60 kpc * 58 kpc. In this paper, we report the discovery of newyoung stellar systems in the outskirts of M81. The most prominent feature is achain of clumps of young stars distributed along the extended southern HI tidalarm connecting M 81 and NGC 3077. The colour-magnitude diagrams of thesestellar systems show plumes of bright main sequence stars and red supergiantstars, indicating extended events of star formation. The main sequenceturn-offs of the youngest stars in the systems are consistent with ages of ~40Myr. The newly reported stellar systems show strong similarities with otherknown young stellar systems in the debris field around M81, with theirproperties best explained by these systems being of tidal origin.

A panoramic view of M81: New stellar systems in the debris field