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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Five halo substructures (disk, Splash, GSE, Thamnos1, Thamnos2) are recovered with distinct chemo-dynamical properties supporting extragalactic origins.
Stellar halos act as transition regions between bright central galaxies and intracluster light, with strong mass correlations, similar colors that redden over time, and a shrinking metallicity gap from 0.4 dex at z=2 to 0.1 dex today.
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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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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Searching for and characterizing halo substructures with the GALAH DR4 survey
Five halo substructures (disk, Splash, GSE, Thamnos1, Thamnos2) are recovered with distinct chemo-dynamical properties supporting extragalactic origins.
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Stellar halos of bright central galaxies II: Scaling relations, colors and metallicity evolution with redshift
Stellar halos act as transition regions between bright central galaxies and intracluster light, with strong mass correlations, similar colors that redden over time, and a shrinking metallicity gap from 0.4 dex at z=2 to 0.1 dex today.
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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.