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 a series of three papers, Eadie et al. developed a hierarchical Bayesianmethod to estimate the Milky Way Galaxy's mass given a physical model for thepotential, a measurement model, and kinematic data of test particles such asglobular clusters (GCs) or halo stars in the Galaxy's halo. The Galaxy's virialmass was found to have a 95\% Bayesian credible region (c.r.) of $(0.67, 1.09)\times 10^{12} M_{\odot}$. In the present study, we test the hierarchicalBayesian method against simulated galaxies created in the McMaster UnbiasedGalaxy Simulations 2 (MUGS2), for which the true mass is known. We estimate themasses of MUGS2 galaxies using GC analogs from the simulations as tracers. Theanalysis, completed as a blind test, recovers the true $M_{200}$ of the MUGS2galaxies within 95\% Bayesian c.r. in 8 out of 18 cases. Of the 10 galaxymasses that were not recovered within the 95\% c.r., a large subset haveposterior distributions that occupy extreme ends of the parameter space allowedby the priors. A few incorrect mass estimates are explained by the exceptionalevolution history of the galaxies. We also find evidence that the model cannotdescribe both the galaxies' inner and outer structure simultaneously in somecases. After removing the GC analogs associated with the galactic disks, thetrue masses were found more reliably (13 out of 18 were predicted within thec.r.). Finally, we discuss how representative the GC analogs are of the real GCpopulation in the Milky Way.

Estimating the Milky Way's Mass via Hierarchical Bayes: A Blind Test on MUGS2 Simulated Galaxies