Fig. 25

image

Distribution of DR2 stars in a circle of 15 degrees radius around the Galactic anticentre direction in the L = Ly vs. Lz space. The Helmi stream is the distinct density enhancement near the bottom of the plot (in blue). We have assumed here vrot = 220 km s−1 for the LSR velocity, vz,⊙ = 5 km s−1, and vϕ,⊙ = 7 km s−1 for the peculiar motion of the Sun, and R = 8.1 kpc.

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