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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this work, two new axisymmetric models for the Galactic mass distributionare presented. Motivated by recent results, these two models include thecontribution of a stellar thin disc and of a thick disc, as massive as the thincounterpart but with a shorter scale-length. Both models satisfy a number ofobservational constraints: stellar densities at the solar vicinity, thin andthick disc scale lengths and heights, rotation curve(s), and the absolute valueof the perpendicular force Kz as a function of distance to the Galactic centre.We numerically integrate into these new models the motion of all Galacticglobular clusters for which distances, proper motions, and radial velocitiesare available, and the orbits of about one thousand stars in the solarvicinity. The retrieved orbital characteristics are compared to those obtainedby integrating the clusters and stellar orbits in pure thin disc models. Wefind that, due to the possible presence of a thick disc, the computed orbitalparameters of disc stars can vary by as much as 30-40%. We also show that thesystematic uncertainties that affect the rotation curve still plague computedorbital parameters of globular clusters by similar amounts.

A Milky Way with a massive, centrally concentrated thick disc: new Galactic mass models for orbit computations