1 / 31

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:.

jenny
Download Presentation

Ram Pressure Stripping of Disk Galaxies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related