Diagonal Ridge pattern of different age populations found in Gaia DR2 with LAMOST Main-Sequence-Turn-Off and OB type Stars

H. -F. Wang, Y. Huang, H. -W. Zhang +5

We revisit the diagonal ridge feature (diagonal distributions in the $R,v_{\varphi }$ plane) found in $Gaia$ and present timing analysis for it between Galactocentric distances of $R=7.5$…