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• W4293116248 abstract "We present the discovery of a wide retrograde moving group in the disk plane of the Milky Way using action-angle coordinates derived from the textit{Gaia} DR3 catalog. The structure is identified from a sample of its members that are currently almost at the pericenter of their orbit and are passing through the Solar neighborhood. The motions of the stars in this group are highly correlated, indicating that the system is probably not phase mixed. With a width of at least 1.5 kpc and with a probable intrinsic spread in metallicity, this structure is most likely the wide remnant of a tidal stream of a disrupted ancient dwarf galaxy (age $sim 12$ Gyr, $langle {rm [Fe/H]} rangle sim -1.74$). The structure presents many similarities (e.g. in energy, angular momentum, metallicity, and eccentricity) with the Sequoia merging event. However, it possesses extremely low vertical action $J_z$ which makes it unique even amongst Sequoia dynamical groups. As the low $J_z$ may be attributable to dynamical friction, we speculate that the these stars may be the remnants of the dense core of the Sequoia progenitor." @default.
• W4293116248 created "2022-08-26" @default.
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• W4293116248 date "2022-08-26" @default.
• W4293116248 modified "2023-10-14" @default.
• W4293116248 title "Antaeus: A Retrograde Group of Tidal Debris in the Milky Way’s Disk Plane" @default.
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• W4293116248 doi "https://doi.org/10.3847/2041-8213/ac86d3" @default.
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