The Milky Way stellar disk shows a broken radial density profile with four components, azimuthal dependence, inner and outer flaring, and a density-metallicity bump possibly from radial migration.
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The low-angular-momentum Hercules III and IV subgroups, after removing high-alpha thick disk stars, show iron-peak and Odd-Z enhancements that suggest an origin near the Milky Way's outer bar.
Simulations show Lindblad-resonance wrinkles from non-winding spirals are filled with zero-age stars on orbits normally occupied by much older populations, offering an age-based constraint on past transient spiral patterns.
3I/ATLAS is likely an old, active comet about 2 km across, and its high speed implies it formed roughly 3 to 11 billion years ago around a low-metallicity star.
citing papers explorer
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Mapping the Milky Way with Gaia Bp/Rp spectra-IV: the broken and asymmetric density profile of the stellar disk traced by a large sample of red clumps
The Milky Way stellar disk shows a broken radial density profile with four components, azimuthal dependence, inner and outer flaring, and a density-metallicity bump possibly from radial migration.
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Wrinkles in Time. II. Stellar Age Trends in Kinematic Signatures from Transient Spiral Structure
Simulations show Lindblad-resonance wrinkles from non-winding spirals are filled with zero-age stars on orbits normally occupied by much older populations, offering an age-based constraint on past transient spiral patterns.