English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The asymmetric drift (AD) tomography in different populations will be helpfulfor us to better understand the disk kinematics, dynamics and rotation curves.Using the common stars from the LAMOST and Gaia surveys as well as circularvelocity of Gaia DR3, we qualitatively explore the asymmetric driftdistribution of the Galactic disk from 8$-$16 \,kpc. In the $R-Z$ plane, wefind the asymmetric drift near the plane of the Galactic disk is small, andthen gradually increases with the increase of the vertical distance, whichmakes the asymmetric drift appear as a ``horn" shape in the $R-Z$ plane.Meanwhile, we reveal that high [$\alpha$/Fe] populations have larger asymmetricdrift than that in the low [$\alpha$/Fe] populations. The asymmetric driftaround the solar location V$_a$ = 6 km s$^{-1}$ and the asymmetric drift medianvalue of the whole sample is 16 km s$^{-1}$. Moreover, we also find that theasymmetric drift median value in the north (20 km s$^{-1}$) of the Galacticdisk is larger than that in the south (13 km s$^{-1}$), all errors are within 2km s$^{-1}$. Furthermore, when we investigate the asymmetric drift of theGalactic disk in the mono-age stellar populations, we also find that the olderstellar populations have larger asymmetric drift and velocity dispersion whichis consistent with predictions of previous numerical models. Finally, based onthe chemistry, we unveil that the average asymmetric drift of the thick disk ismuch higher than that of the thin disk.

Asymmetric Drift Map of the Milky Way disk Populations between 8$-$16 kpc with LAMOST and Gaia datasets