A coupled galaxy-cluster model shows that Milky Way globular clusters, many from satellite galaxies, form dynamically interacting black hole binaries whose merger rates increase with redshift up to z=5.
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Chemical tagging via Gaussian Mixture Model on multiple abundances shows that halo substructures Sequoia, Heracles, Thamnos, and Helmi Stream are contaminated mixtures dominated by GSE and disc stars, with additional contributions from Sagittarius and omega Cen.
The MGCS releases official catalogs, completeness tests, and improved absolute proper motions (~3x better than Gaia) for 34 Galactic globular clusters, updating associations with galaxy progenitors for several systems.
RR Lyrae stars yield metallicity measurements for Milky Way halo substructures including Gaia Sausage/Enceladus at [Fe/H] = -1.57 dex, with some features like ED-1 showing disk contamination and others like Shiva and Shakti suggested as in-situ.
Using 8D chemical clustering on APOGEE DR17 and kinematic matching to e-TidalGCs simulations, the authors report 470 ω Cen-like stars including 6 kinematically consistent with its stream and additional links to streams from five other clusters, supporting a common disrupted progenitor.
citing papers explorer
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Milky Way Globular Clusters: Nurseries for Dynamically-Formed Binary Black Holes
A coupled galaxy-cluster model shows that Milky Way globular clusters, many from satellite galaxies, form dynamically interacting black hole binaries whose merger rates increase with redshift up to z=5.
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Chemical decoding of kinematic substructures in the Galactic halo
Chemical tagging via Gaussian Mixture Model on multiple abundances shows that halo substructures Sequoia, Heracles, Thamnos, and Helmi Stream are contaminated mixtures dominated by GSE and disc stars, with additional contributions from Sagittarius and omega Cen.
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The Hubble Missing Globular Cluster Survey. III. Astro-photometric catalogs, artificial-star tests, and improved absolute proper motions
The MGCS releases official catalogs, completeness tests, and improved absolute proper motions (~3x better than Gaia) for 34 Galactic globular clusters, updating associations with galaxy progenitors for several systems.
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Probing the Milky Way Halo with RR Lyrae Stars from Gaia Data Release 3
RR Lyrae stars yield metallicity measurements for Milky Way halo substructures including Gaia Sausage/Enceladus at [Fe/H] = -1.57 dex, with some features like ED-1 showing disk contamination and others like Shiva and Shakti suggested as in-situ.
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The Nephele ecosystem: stars, globular clusters, and stellar streams associated with the progenitor galaxy of $\omega$ Centauri
Using 8D chemical clustering on APOGEE DR17 and kinematic matching to e-TidalGCs simulations, the authors report 470 ω Cen-like stars including 6 kinematically consistent with its stream and additional links to streams from five other clusters, supporting a common disrupted progenitor.