A neural network trained on simulations infers stripping times for Sagittarius stream stars from phase-space data, measuring a 0.3 dex/Gyr metallicity gradient and estimating ages for globular clusters such as Pal 12 and NGC 2419.
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Spectroscopic members of the M92 stream yield a Milky Way bar pattern speed of 29.1 +0.7/-0.4 km s^{-1} kpc^{-1}.
Young giant stars reveal a flaring Milky Way disc with 3.5 kpc radial scale and extended spiral arms including a curved Perseus segment and a new Scutum-associated feature.
A new crystallization index C_index ranks globular clusters by ordered radial and kinematic substructure from Gaia data, identifying a few complex systems but no evidence for phase-space features requiring explanations outside standard dynamics.
The Gaia-Sausage-Enceladus merger occurred 11.2 ± 0.1 Gyr ago, coinciding with the formation of a group of globular clusters and potentially leaving ω Centauri as its remnant, while placing disk formation at z ≳ 4.
Bulge Fossil Fragments are estimated to generate 15-250 times more binary black hole mergers than typical globular clusters, marking them as a new class of gravitational wave sources.
A blind 12D chemo-dynamical clustering analysis with UMAP and HDBSCAN on SDSS-V DR19 and Gaia DR3 data recovers seven known halo substructures and reports five new tightly bound candidates FO1-FO5.
Spectroscopic survey of outer ω Centauri fields confirms 157 members with 93% success rate and traces tidal tails to 3.2 deg, showing kinematic and metallicity continuity with the cluster and Fimbulthul stream.
Optimized filters centered at 3920-3960 Angstrom yield metallicity estimates with 0.18-0.39 dex precision down to [Fe/H] ~ -4 for metal-poor stars from Gaia XP spectra, enabling a catalog of 14.5 million such stars.
The Sagittarius dwarf progenitor had a metallicity gradient of roughly -0.3 dex per kpc prior to infall.
Wideband observations show M28A giant pulses differ from FRB 20200120E bursts in duration, luminosity, timing statistics, and spectral structure, yielding no strong evidence for a direct link.
N-body simulations demonstrate that the inspiral of globular clusters in UGC 7346 results in the formation of a nuclear star cluster with mass (4.1-4.5)×10^5 solar masses within 1.5 Gyr.
The paper reports 21 previously unknown variable stars in M71 along with refined cluster parameters (age 12.9 Gyr, [Fe/H] = -0.88, E(B-V) = 0.21, distance modulus 13.01) from a decontaminated CMD.
New SBF distance confirms NGC5846_UDG1 lies in the NGC 5846 group and reconciles prior GC counts to ~50 members, supporting a massive dark matter halo.
GaiaNIR retains sensitivity to extended dark matter halos in globular clusters under strong extinction while Gaia degrades, enabling studies in obscured regions.
Six new faint isolated millisecond pulsars discovered in NGC 6517 and M15 using stacked power spectra from FAST observations.
N-body simulations show that mutual interactions between Terzan 2, 4, and 5 raise mass-loss rates for the smaller clusters and drive prolate deformations absent in isolated runs.
A unified JSONL/CSV corpus merges photometric, kinematic, dynamical, and chemical parameters for all 174 Milky Way globular clusters from Harris, Gaia EDR3, Baumgardt N-body, and APOGEE DR17 surveys.
citing papers explorer
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Reconstructing the Stripping History of the Sagittarius Stream with Neural Networks
A neural network trained on simulations infers stripping times for Sagittarius stream stars from phase-space data, measuring a 0.3 dex/Gyr metallicity gradient and estimating ages for globular clusters such as Pal 12 and NGC 2419.
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Constraining the Galactic bar using the M92 stellar stream
Spectroscopic members of the M92 stream yield a Milky Way bar pattern speed of 29.1 +0.7/-0.4 km s^{-1} kpc^{-1}.
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The flare and spiral structure of the Milky Way's disc as traced by young giant stars
Young giant stars reveal a flaring Milky Way disc with 3.5 kpc radial scale and extended spiral arms including a curved Perseus segment and a new Scutum-associated feature.
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Phase-Space Crystallization in Galactic Globular Clusters: A Gaia-Based Metric and Implications for Technosignature Searches
A new crystallization index C_index ranks globular clusters by ordered radial and kinematic substructure from Gaia data, identifying a few complex systems but no evidence for phase-space features requiring explanations outside standard dynamics.
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The Last Galactic Firework: Timing the last significant merger with stars, globular clusters and $\omega$Centauri
The Gaia-Sausage-Enceladus merger occurred 11.2 ± 0.1 Gyr ago, coinciding with the formation of a group of globular clusters and potentially leaving ω Centauri as its remnant, while placing disk formation at z ≳ 4.
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Bulge Fossil Fragments as a new population of factories of gravitational wave sources in the Galaxy
Bulge Fossil Fragments are estimated to generate 15-250 times more binary black hole mergers than typical globular clusters, marking them as a new class of gravitational wave sources.
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Unsupervised Chemo-Dynamical Dissection of the Inner Galactic Halo: Discovery of Five Accreted Substructures with SDSS-V and Gaia
A blind 12D chemo-dynamical clustering analysis with UMAP and HDBSCAN on SDSS-V DR19 and Gaia DR3 data recovers seven known halo substructures and reports five new tightly bound candidates FO1-FO5.
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Disruption of a Giant: Spectroscopic Identification of Members in the Periphery and Tidal Tails of $\omega$ Centauri
Spectroscopic survey of outer ω Centauri fields confirms 157 members with 93% success rate and traces tidal tails to 3.2 deg, showing kinematic and metallicity continuity with the cluster and Fimbulthul stream.
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Filter Design for Estimating the Stellar Metallicity of Metal-poor Stars from Gaia XP Spectra
Optimized filters centered at 3920-3960 Angstrom yield metallicity estimates with 0.18-0.39 dex precision down to [Fe/H] ~ -4 for metal-poor stars from Gaia XP spectra, enabling a catalog of 14.5 million such stars.
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The Metallicity Gradient of Sagittarius Dwarf Spheroidal Galaxy Prior to Infall Constrained by S-PLUS Observations of its Tidal Stream
The Sagittarius dwarf progenitor had a metallicity gradient of roughly -0.3 dex per kpc prior to infall.
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Searching for links between energetic millisecond pulsars and repeating fast radio bursts
Wideband observations show M28A giant pulses differ from FRB 20200120E bursts in duration, luminosity, timing statistics, and spectral structure, yielding no strong evidence for a direct link.
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Formation of a nuclear star cluster through the inspiral of globular clusters: A case study of the dwarf elliptical galaxy UGC 7346
N-body simulations demonstrate that the inspiral of globular clusters in UGC 7346 results in the formation of a nuclear star cluster with mass (4.1-4.5)×10^5 solar masses within 1.5 Gyr.
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Variable stars in the field of the Galactic globular cluster M71
The paper reports 21 previously unknown variable stars in M71 along with refined cluster parameters (age 12.9 Gyr, [Fe/H] = -0.88, E(B-V) = 0.21, distance modulus 13.01) from a decontaminated CMD.
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Revisiting the distance and the globular cluster system of the remarkable galaxy UDG1 in the NGC 5846 group
New SBF distance confirms NGC5846_UDG1 lies in the NGC 5846 group and reconciles prior GC counts to ~50 members, supporting a massive dark matter halo.
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From Gaia to GaiaNIR: I. Probing dark matter halos in globular clusters
GaiaNIR retains sensitivity to extended dark matter halos in globular clusters under strong extinction while Gaia degrades, enabling studies in obscured regions.
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The Stack Search Tests on FAST Data: Discovery of Six Faint Isolated Millisecond Pulsars in NGC 6517 and NGC 7078 (M15)
Six new faint isolated millisecond pulsars discovered in NGC 6517 and M15 using stacked power spectra from FAST observations.
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Dynamical evolution of Milky Way globular clusters on the cosmological timescale II. Terzan 2, 4, and 5 mass loss and collision tracking
N-body simulations show that mutual interactions between Terzan 2, 4, and 5 raise mass-loss rates for the smaller clusters and drive prolate deformations absent in isolated runs.
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A Multi-Survey Machine-Readable Corpus of Milky Way Globular Cluster Parameters for Retrieval-Augmented Generation Applications
A unified JSONL/CSV corpus merges photometric, kinematic, dynamical, and chemical parameters for all 174 Milky Way globular clusters from Harris, Gaia EDR3, Baumgardt N-body, and APOGEE DR17 surveys.