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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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.