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Radial Mixing in Galactic Disks: The Effects of Disk Structure and Satellite Bombardment

Radial Mixing in Galactic Disks: The Effects of Disk Structure and Satellite Bombardment. Jonathan C. Bird Stelios Kazantzidis, David H. Weinberg The Ohio State University. The CCAPP Symposium 2009. M74 (HST). Stellar Migration.

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Radial Mixing in Galactic Disks: The Effects of Disk Structure and Satellite Bombardment

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  1. Radial Mixing in Galactic Disks: The Effects of Disk Structure and Satellite Bombardment Jonathan C. Bird Stelios Kazantzidis, David H. Weinberg The Ohio State University The CCAPP Symposium 2009 2009 CCAPP Symposium M74 (HST)

  2. Stellar Migration • Corotational resonance of transient spiral and star (Sellwood and Binney) • Stars maintain eccentricity • Discrete p → many scatterings 2009 CCAPP Symposium

  3. OfferedSolutions • Typical C.E. models are “inside-out” • Tinsley (1975), Matteuchi & Francois (1989), Boissier & Prantzos (1999), etc. • Can’t explain: • Age-Metallicity dispersion (e.g. Edvardsson 1993) • Abundance gradients in disk galaxies 2009 CCAPP Symposium

  4. Simulations • Collisionless, N-body SPH simulations • Kazantzidis et. al (2008ApJ...688..254K) • Compare final and initial output of four simulations: • Disk Structure (scale height) • Accretion history (Isolated or Perturbed) • Six satellites: 20-60% of the parent disk mass • Orbits and masses: cosmologically motivated 2009 CCAPP Symposium

  5. Radial Mixing • Disk structure matters • Strong radial mixing even with light Satellite bombardment • Increased radial mixing in mergers • Asymmetric r distribution for perturbed disks 2009 CCAPP Symposium

  6. Solar Vicinity Difficult to establish history through radial mixing only 2009 CCAPP Symposium

  7. Vertical Energy zmax= z0 – vz2/(2a) • Zmax is proportional to r • Vertical heating • Thick disk creation mechanism? 2009 CCAPP Symposium

  8. Takeaways • Soon: Orbit shape; Gas • Disk structure plays major role in radial mixing • Satellite bombardment also causes radial mixing • Future: incorporate results into C.E. models 2009 CCAPP Symposium

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