Roškar, Rok, Debattista, Victor P, Quinn, Thomas R., Stinson, Gregory S. and Wadsley, James (2008) Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks. The Astrophysical Journal, 684 (2). L79-L82. ISSN 0004-637X
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Official URL: http://dx.doi.org/10.1086/592231
Stars in disks of spiral galaxies are usually assumed to remain roughly at their birth radii. This assumption is built into decades of modeling of the evolution of stellar populations in our own Galaxy and in external systems. We present results from self-consistent high-resolution N-body + smooth particle hydrodynamics simulations of disk formation, in which stars migrate across significant galactocentric distances due to resonant scattering with transient spiral arms, while preserving their circular orbits. We investigate the implications of such migrations for observed stellar populations. Radial migration provides an explanation for the observed flatness and spread in the age-metallicity relation and the relative lack of metal-poor stars in the solar neighborhood. The presence of radial migration also prompts rethinking of interpretations of extragalactic stellar population data, especially for determinations of star formation histories.
|Uncontrolled Keywords (separate with ;):||galaxies: evolution; galaxies: spiral; galaxies: stellar content; Galaxy: stellar content; solar neighborhood; stellar dynamics|
|Subjects:||Q Science > QC Physics|
|Schools:||College of Science and Technology > School of Physical Sciences and Computing > Jeremiah Horrocks Institute|
|Deposited By:||Helen Cooper|
|Deposited On:||20 Mar 2012 17:28|
|Last Modified:||24 Mar 2014 10:47|
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