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

Galaxy stellar mass is known to be monotonically related to the size of thegalaxy's globular cluster (GC) population for Milky Way sized and largergalaxies. However, the relation becomes ambiguous for dwarf galaxies, wherethere is some evidence for a downturn in GC population size at low galaxymasses. Smaller dwarfs are increasingly likely to have no GCs, and these zeroscannot be easily incorporated into linear models. We introduce the HierarchicalERrors-in-variables Bayesian lognormAL hurdle (HERBAL) model to represent therelationship between dwarf galaxies and their GC populations, and apply it tothe sample of Local Group galaxies where the luminosity range coverage ismaximal. This bimodal model accurately represents the two populations of dwarfgalaxies: those that have GCs and those that do not. Our model thoroughlyaccounts for all uncertainties, including measurement uncertainty, uncertaintyin luminosity to stellar mass conversions, and intrinsic scatter. Thehierarchical nature of our Bayesian model also allows us to estimate galaxymasses and individual mass-to-light ratios from luminosity data within themodel. We find that 50% of galaxies are expected to host globular clusterpopulations at a stellar mass of $\log_{10}(M_*)=6.996$, and that the expectedmass of GC populations remains linear down to the smallest galaxies. Ourhierarchical model recovers an accurate estimate of the Milky Way stellar mass.Under our assumed error model, we find a non-zero intrinsic scatter of$0.59_{-0.21}^{+0.30}$ (95% credible interval) that should be accounted for infuture models.

The HERBAL model: A hierarchical errors-in-variables Bayesian lognormal hurdle model for galactic globular cluster populations