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10/13/20092009 CCAPP Symposium1 Radial Mixing in Galactic Disks: The Effects of Disk Structure and Satellite Bombardment Jonathan C. Bird Stelios Kazantzidis,

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Presentation on theme: "10/13/20092009 CCAPP Symposium1 Radial Mixing in Galactic Disks: The Effects of Disk Structure and Satellite Bombardment Jonathan C. Bird Stelios Kazantzidis,"— Presentation transcript:

1 10/13/ CCAPP Symposium1 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)

2 10/13/ CCAPP Symposium2 Stellar Migration Corotational resonance of transient spiral and star (Sellwood and Binney) Stars maintain eccentricity Discrete p many scatterings

3 10/13/ CCAPP Symposium3 Offered Solutions Typical C.E. models are inside-out –Tinsley (1975), Matteuchi & Francois (1989), Boissier & Prantzos (1999), etc. Cant explain: –Age-Metallicity dispersion (e.g. Edvardsson 1993) –Abundance gradients in disk galaxies

4 10/13/ CCAPP Symposium4 Simulations Collisionless, N-body SPH simulations –Kazantzidis et. al (2008ApJ K) 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

5 10/13/ CCAPP Symposium5 Radial Mixing Disk structure matters Strong radial mixing even with light Satellite bombardment Increased radial mixing in mergers Asymmetric r distribution for perturbed disks

6 10/13/ CCAPP Symposium6 Solar Vicinity Difficult to establish history through radial mixing only

7 10/13/ CCAPP Symposium7 Vertical Energy z max = z 0 – v z 2 /(2a) Z max is proportional to r Vertical heating Thick disk creation mechanism?

8 10/13/ CCAPP Symposium8 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


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