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Ram Pressure Stripping of Disk Galaxies

Ram Pressure Stripping of Disk Galaxies. Elke Schumacher , Institute of Theoretical Physics und Astrophysics Uni Kiel Gerhard Hensler, Institute for Astronomy Uni Vienna Environments of Galaxies, Crete, August 2004. . Roediger. Analytical Estimate:. Analytical Estimate:.

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Ram Pressure Stripping of Disk Galaxies

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  1. Ram Pressure Stripping of Disk Galaxies Elke Schumacher, Institute of Theoretical Physics und Astrophysics Uni Kiel Gerhard Hensler, Institute for Astronomy Uni Vienna Environments of Galaxies, Crete, August 2004  Roediger

  2. Analytical Estimate:

  3. Analytical Estimate:

  4. Analytical Estimate: 2 dF/dz * Sgas(r) = fgrav= pram = rICMvICM

  5. Analytical Estimate: 2 dF/dz * Sgas(r) = fgrav=pram = rICMvICM

  6. Analytical Estimate: > 2 dF/dz * Sgas(r) = fgrav= pram = rICMvICM <

  7. Analytical Estimate: > 2 dF/dz * Sgas(r) = fgrav= pram = rICMvICM < independent of vertical structure (thickness) ? independent of Mach number?

  8. Scanning the wind parameter space: ICM sound speed ( TICM=4*107K) cluster centres to outskirts

  9. stellar disk mass 8 * 1010 Msun bulge 2 * 1010 Msun gas disk mass 8 * 109 Msun DM mass (R<50kpc) 3.8 * 1011 Msun The model galaxy:

  10. The model galaxy - gas disk: density: 10-3 cm-3= 10-27 g cm-3

  11. The model galaxy - gas disk: same S(r)

  12. Results - time evolution: 2 nICMvICM =1000 cm-3km2 / s2 density: 10-3 cm-3= 10-27 g cm-3

  13. Results - mass and radius of remaining disk: measured: a) mass inside disk region b) bound mass

  14. Results - mass and radius of remaining disk:

  15. Results - mass and radius of remaining disk: 2 nICMvICM =1000 cm-3km2 / s2

  16. Results - mass and radius of remaining disk: 2 nICMvICM =1000 cm-3km2 / s2 1Msun / yr

  17. Results - mass and radius of remaining disk: 2 nICMvICM =10 000 cm-3km2 / s2

  18. Results - mass and radius of remaining disk: 2 nICMvICM =100 cm-3km2 / s2

  19. Results - time evolution: 2 nICMvICM =10 cm-3km2 / s2

  20. Results - influence of vertical structure: 2 nICMvICM =1000 cm-3km2 / s2

  21. Results - influence of Mach number: 2 nICMvICM =1000 cm-3km2 / s2

  22. Comparison analytical-numerical: 2 nICMvICM =1000 cm-3km2 / s2

  23. Comparison analytical -numerical a dF/dz * Sgas(r) = fgrav = pram = rICMvICM > < 2

  24. Comparison analytical -numerical adF/dz * Sgas(r) = fgrav = pram = rICMvICM > < 2

  25. Comparison analytical -numerical a dF/dz * Sgas(r) = fgrav = pram = rICMvICM a= 0.25 > < 2

  26. How much gas does fall back? ISM that has left the disk: • 10 to 15% of original gas disk mass

  27. Conclusions: • Stripping radius can be predicted approximately by simple analytical estimate • mainly dependent on ram pressure, slightly on Mach number • independent of vertical structure of gas disk • Cluster centres: heavy truncation and mass loss • displacement of all but inner part in few 10Myr • displaced gas unbound in few 100Myr • Cluster outskirts: nearly no mass loss, yet truncation • displacement of edge in few 100Myr • displaced gas not gas unbound, but falls back

  28. Future Work • basis for further investigations: • inhomogeneous ISM • inclination (other than face-on) • time-dependent wind - cluster crossing

  29. Timescales: 10x

  30. Results - mass and radius of remaining disk: 2 nICMvICM =10 cm-3km2 / s2

  31. Results - location of bound gas: 2 nICMvICM =1000 cm-3km2 / s2

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