Dynamos with wind

• Antragsteller: Dr. Detlef Elstner; Professor Dr. Harald Lesch
• Fachliche Zuordnung: Astrophysik und Astronomie
• Förderung: Förderung von 2010 bis 2017
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 108727618

• Erstellungsjahr: 2017

Zusammenfassung der Projektergebnisse

The box simulations of the ISM lead to a full non-linear description of the mean field dynamo in dependence on the local properties like rotation, density and star formation. The saturation mechanism of the dynamo by a wind could be identified. With this complete description of the local dynamo process a sub-grid model for global disk galaxies could be developed. The results mark an important step on which derived mean-field models rely to explain observed equipartition-strength fields. The inclusion of cosmic rays with a diffusion-advection description did not significantly change the growth rate of the dynamo, but the properties of the turbulence became more anisotropic. Under the assumption of equipartition between cosmic rays and magnetic field it was shown by analytic considerations and supported by a global disk simulation, that the effect of the Lorentz force on the gas rotation is rather limited and will not explain a flat rotation curve with the observable matter distribution. This is also supported by recent LOFAR measurements of the synchrotron scale length. The implementation of turbulence properties as sub-grid model in SPMHD is completed. In this connection also a new algorithm using the vector potential for the magnetic field could improve the accuracy of the method by fullfilling its solenoidality.

Projektbezogene Publikationen (Auswahl)

• MNRAS, 429, L60
  Beck, A. M., Hanasz, M., Lesch, H., Remus, R.-S., Stasyszyn, F. A.
  (Siehe online unter https://doi.org/10.1093/mnrasl/sls026)
• 2013, MNRAS, 428, 13
  Stasyszyn, F. A., Dolag, K., Beck, A. M.
  (Siehe online unter https://doi.org/10.1093/mnras/sts018)
• 2013, MNRAS, 429, 967
  Gressel, O., Bendre, A., Elstner, D.
  (Siehe online unter https://doi.org/10.1093/mnras/sts356)
• 2013, MNRAS, 435, 3575
  Beck, A.M., Dolag, K., Lesch, H., Kronberg, P.P.
  (Siehe online unter https://doi.org/10.1093/mnras/stt1549)
• 2014, A&A, 568, 104
  Elstner, D., Beck, R., Gressel, O.
  (Siehe online unter https://doi.org/10.1051/0004-6361/201423960)
• 2014, MNRAS, 443, 3107
  Lacerna, I., Padilla, N., Stasyszyn, F.
  (Siehe online unter https://doi.org/10.1093/mnras/stu1318)
• 2015, AN, 336, 991
  Bendre, A., Gressel, O., Elstner, D.
  (Siehe online unter https://doi.org/10.1002/asna.201512211)
• 2015, CoPh, 282, 148
  Stasyszyn, F.A., Elstner, D.
  (Siehe online unter https://doi.org/10.1016/j.jcp.2014.11.011)
• 2016, JCAP, 056
  Beck, M.C., Beck, A.M., Beck, R., Dolag, K. et al.
  (Siehe online unter https://doi.org/10.1088/1475-7516/2016/05/056)
• 2016, MNRAS, 455, 1989
  Goicovic, F. G., Cuadra, J., Sesana, A., Stasyszyn, F., Amaro-Seoane, P., Tanaka, T. L.
  (Siehe online unter https://doi.org/10.1093/mnras/stv2470)