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

Globular clusters are unique tracers of ancient star formation. We determinethe formation efficiencies of globular clusters across cosmic time by modelingthe formation and dynamical evolution of the globular cluster population of aMilky Way type galaxy in hierarchical cosmology, using the merger tree from theVia Lactea II simulation. All of the models are constrained to reproduce theobserved specific frequency and initial mass function of globular clusters inisolated dwarfs. Globular cluster orbits are then computed in a time varyinggravitational potential after they are either accreted from a satellite halo orformed in situ, within the Milky Way halo. We find that the Galactocentricdistances and metallicity distribution of globular clusters are very sensitiveto the formation efficiencies of globular clusters as a function of redshiftand halo mass. Our most accurate models reveal two distinct peaks in theglobular cluster formation efficiency at z~2 and z~7-12 and prefer a formationefficiency that is mildly increasing with decreasing halo mass, the opposite ofwhat expected for feedback-regulated star formation. This model accuratelyreproduces the positions, velocities, mass function, metallicity distribution,and age distribution of globular clusters in the Milky Way and predicts that ~40% formed in situ, within the Milky Way halo, while the other ~ 60% wereaccreted from about 20 satellite dwarf galaxies with Vc > 30 km/s, and about29% or all globular clusters formed at redshifts z > 7. These results furtherstrengthen the notion that globular cluster formation was an important mode ofstar formation in high-redshift galaxies and likely played a significant rolein the reionization of the intergalactic medium

Clues on the Missing Sources of Reionization from Self-consistent Modeling of Milky Way and Dwarf Galaxy Globular Clusters