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The nature and origin of the Galactic warp represent one of the openquestions posed by Galactic evolution. Thanks to Gaia high precision absoluteastrometry, steps towards the understanding of the warp's dynamical nature canbe made. Indeed, proper motions for long-lived stable warp are expected to showmeasurable trends in the component vertical to the galactic plane. Within thiscontext, we search for the kinematic warp signal in the first Gaia data release(DR1). By analyzing distant spectroscopically-identified OB stars in theHipparcos subset in Gaia DR1, we find that the kinematic trends cannot beexplained by a simple model of a long-lived warp. We therefore discuss possiblescenarios for the interpretation of the obtained results. We also presentcurrent work in progress to select a larger sample of OB star candidates fromthe Tycho-Gaia Astrometric Solution (TGAS) subsample in DR1, and delineate thepoints that we will be addressing in the near future.

Search for Galactic warp signal in Gaia DR1 proper motions