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Connecting the Local Stellar Halo and Its Dark Matter Density to Dwarf Galaxies via Blue Stragglers

Casagrande, Luca


The Gaia H-R diagram shows the presence of apparently young stars at high tangential velocities. Using a simple analytical model, I show that these stars are likely to be blue stragglers. Once normalized to red giant stars, the fraction of nearby halo blue stragglers is of order 20%, and remarkably close to that measured in dwarf galaxies. Motivated by this similarity, I apply to field blue stragglers scaling relations inferred from blue stragglers in dwarf galaxies. Doing this for the Milky...[Show more]

CollectionsANU Research Publications
Date published: 2020
Type: Journal article
Source: The Astrophysical Journal
DOI: 10.3847/1538-4357/ab929f
Access Rights: Open Access


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