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Paper: Learning about Disk Formation from Their Outskirts
Volume: 396, Formation and Evolution of Galaxy Disks
Page: 217
Authors: Roskar, R.; Debattista, V.P.; Stinson, G.S.; Quinn, T.R.; Kaufmann, T.; Wadsley, J.
Abstract: We present results from the first in a series of isolated N-body smooth particle hydrodynamics experiments aimed at studying the phenomenon of breaks in the surface brightness profiles of disk galaxies. Our simulations form a disk in the center of a dark matter halo through dissipational collapse and star formation without any a priori assumptions about the distribution of material in the disk itself. A large fraction of the material beyond the disk break originated in the inner parts of the disk and migrated outwards via resonances with spiral arms. Such migrations have a significant impact on the evolution of stellar population gradients. Our simulations yield testable observational predictions regarding these stellar populations and we argue that the outer disks could be used as diagnostics for understanding disk evolution processes in general.
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