Advancing globular cluster constraints on the axion-photon coupling [PDF]
Journal of Cosmology and Astroparticle Physics, 2022 We improve the current upper bound on the axion-photon coupling derived from stellar evolution using the R 2 parameter, the ratio of stellar populations on the Asymptotic Giant Branch to Horizontal Branch in Globular Clusters.
M. Dolan +2 more
semanticscholar +1 more source
A repeating fast radio burst source in a globular cluster [PDF]
Nature, 2021 Fast radio bursts (FRBs) are flashes of unknown physical origin1. The majority of FRBs have been seen only once, although some are known to generate multiple flashes2,3.
F. Kirsten +65 more
semanticscholar +1 more source
Proper motions and dynamics of the Milky Way globular cluster system fromGaiaDR2 [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We use Gaia Data Release 2 to determine the mean proper motions for 150 Milky Way globular clusters (almost the entire known population), with a typical uncertainty of 0.05 mas/yr limited mainly by systematic errors. Combining them with distance and line-
E. Vasiliev
semanticscholar +1 more source
Prospects for Detecting Fast Radio Bursts in the Globular Clusters of Nearby Galaxies
The Astrophysical Journal, 2023 The recent detection of a repeating fast radio burst (FRB) in an old globular cluster in M81 challenges traditional FRB formation mechanisms based on the magnetic activity of young neutron stars formed in core-collapse supernovae.
Kyle Kremer +4 more
doaj +1 more source
The formation and hierarchical assembly of globular cluster populations [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We use a semi-analytic model for globular cluster (GC) formation built on dark matter merger trees to explore the relative role of formation physics and hierarchical assembly in determining the properties of GC populations.
K. El-Badry +4 more
semanticscholar +1 more source
What is a globular cluster? An observational perspective [PDF]
The Astronomy and Astrophysics Review, 2019 Globular clusters are large and dense agglomerate of stars. At variance with smaller clusters of stars, they exhibit signs of some chemical evolution.
R. Gratton +5 more
semanticscholar +1 more source
Formation of globular cluster systems: from dwarf galaxies to giants [PDF]
Monthly notices of the Royal Astronomical Society, 2018 Globular cluster (GC) systems around galaxies of a vast mass range show remarkably simple scaling relations. The combined mass of all GCs is a constant fraction of the total galaxy mass and the mean metallicity and metallicity dispersion of the GC system
Nick Choksi, O. Gnedin, Hui Li
semanticscholar +1 more source
The formation and assembly history of the Milky Way revealed by its globular cluster population [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We use the age–metallicity distribution of 96 Galactic globular clusters (GCs) to infer the formation and assembly history of the Milky Way (MW), culminating in the reconstruction of its merger tree.
J. Kruijssen +5 more
semanticscholar +1 more source
High-precision Dark Halo Virial Masses from Globular Cluster Numbers: Implications for Globular Cluster Formation and Galaxy Assembly [PDF]
Astronomical Journal, 2019 We confirm that the number of globular clusters (GCs), NGC, is an excellent tracer of their host galaxy’s halo virial mass, Mvir. The simple linear relation Mvir = 5 × 109 M⊙ × NGC fits the data perfectly from Mvir = 1010 M⊙ to Mvir = 2 × 1015 M⊙.
A. Burkert, D. Forbes
semanticscholar +1 more source
The Globular Cluster Systems of Ultra-diffuse Galaxies in the Coma Cluster [PDF]
Astrophysical Journal, 2018 Ultra-diffuse galaxies (UDGs) are unusual galaxies with low luminosities, similar to classical dwarf galaxies, but with sizes up to ∼5 larger than expected for their mass.
Sungsoon Lim +6 more
semanticscholar +1 more source