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Li, X.-Y.; Huang, Y.; Chen, B.-Q.; Wang, H.-F.; Sun, W.-X.; Guo, H.-L.; Li, Q.-Z.; Liu, X.-W.
The Astrophysical journal, 09/2020, Letnik: 901, Številka: 1Journal Article
Using a sample of nearly 140,000 red clump stars selected from the LAMOST and Gaia Galactic surveys, we have mapped mean vertical velocity in the X-Y plane for a large volume of the Galactic disk (6 < R < 16 kpc; −20 < φ < 50°; kpc). A clear signature where increases with R is detected for the chemically thin disk. The signature for the thick disk, however, is not significant, in line with the hot nature of this disk component. For the thin disk, the warp signature shows significant variations in both the radial and azimuthal directions, in excellent agreement with the previous results of star counts. Fitting the two-dimensional distribution of with a simple long-lived static warp model yields a line-of-node angle for this kinematic warp of about 12 5, again consistent with the previous results.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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