The Galactic warp revealed by Gaia DR2 kinematics

  title={The Galactic warp revealed by Gaia DR2 kinematics},
  author={Eloisa Poggio and Ronald Drimmel and Mario Gilberto Lattanzi and Richard L. Smart and Alessandro Spagna and Ren{\'e} Andrae and Coryn A. L. Bailer-Jones and Morgan Fouesneau and T. Antoja and C. Babusiaux and D. W. Evans and Francesca Figueras and David Katz and C'eline Reyl'e and Annie C. Robin and Manuel Romero‐Gomez and George Seabroke},
  journal={Monthly Notices of the Royal Astronomical Society: Letters},
Using Gaia DR2 astrometry, we map the kinematic signature of the Galactic stellar warp out to a distance of 7 kpc from the Sun. Combining Gaia DR2 and 2MASS photometry, we identify, via a probabilistic approach, 599 494 upper main sequence stars and 12 616 068 giants without the need for individual extinction estimates. The spatial distribution of the upper main sequence stars clearly shows segments of the nearest spiral arms. The large-scale kinematics of both the upper main sequence and giant… 

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