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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Simulations show negative metallicity gradients in all low-mass galaxies, U-shaped age profiles in most, and halo metallicity dispersion tied to the infall time of the dominant satellite.
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.
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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Age and metallicity of low-mass galaxies: from their centres to their stellar halos
Simulations show negative metallicity gradients in all low-mass galaxies, U-shaped age profiles in most, and halo metallicity dispersion tied to the infall time of the dominant satellite.
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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.