Hostname: page-component-77c89778f8-m8s7h Total loading time: 0 Render date: 2024-07-20T20:41:43.273Z Has data issue: false hasContentIssue false
  • English
  • Français

Cosmic-ray driven dynamo in galaxies

Published online by Cambridge University Press:  08 June 2011

M. Hanasz ,
D. Wóltanski ,
K. Kowalik  and
H. Kotarba
M. Hanasz
Affiliation:
Centre for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, PL-87-100 Torun, Poland
D. Wóltanski
Affiliation:
Centre for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, PL-87-100 Torun, Poland
K. Kowalik
Affiliation:
Centre for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, PL-87-100 Torun, Poland
H. Kotarba
Affiliation:
University Observatory Munich, Scheinerstr. 1, D-81679 Munich, Germany
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We present recent developments of global galactic-scale numerical models of the Cosmic Ray (CR) driven dynamo, which was originally proposed by Parker (1992). We conduct a series of direct CR+MHD numerical simulations of the dynamics of the interstellar medium (ISM), composed of gas, magnetic fields and CR components. We take into account CRs accelerated in randomly distributed supernova (SN) remnants, and assume that SNe deposit small-scale, randomly oriented, dipolar magnetic fields into the ISM. The amplification timescale of the large-scale magnetic field resulting from the CR-driven dynamo is comparable to the galactic rotation period. The process efficiently converts small-scale magnetic fields of SN-remnants into galactic-scale magnetic fields. The resulting magnetic field structure resembles the X-shaped magnetic fields observed in edge-on galaxies.

Keywords

Galaxies: ISMMagnetic FieldsISM: Cosmic RaysMagnetic FieldsMHD: Dynamos
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S274: Advances in Plasma Astrophysics , September 2010 , pp. 355 - 360
Copyright
Copyright © International Astronomical Union 2011

References

Allen, C. & Santillan, A.: 1991, Revista Mexicana de Astronomia y Astrofisica 22, 255Google Scholar
Berezinskii, V. S., Bulanov, S. V., Dogiel, V. A., & Ptuskin, V. S.: 1990, Astrophysics of cosmic rays, Amsterdam: North-Holland, 1990, edited by Ginzburg, V.L.Google Scholar
Ferriere, K.: 1998, ApJ 497, 759CrossRefGoogle Scholar
Fletcher, A., Beck, R., Shukurov, A., Berkhuijsen, E. M., & Horellou, C.: 2010, ArXiv e-printsGoogle Scholar
Giacalone, J. & Jokipii, J. R.: 1999, ApJ 520, 204CrossRefGoogle Scholar
Hanasz, M., Kowal, G., Otmianowska-Mazur, K., & Lesch, H.: 2004, ApJL 605, L33CrossRefGoogle Scholar
Hanasz, M., Kowalik, K., Wóltański, D. & Pawłaszek, R.: 2008, ArXiv e-printsGoogle Scholar
Hanasz, M., Kowalik, K., Wóltański, D. & Pawłaszek, R.: 2009a, ArXiv e-printsGoogle Scholar
Hanasz, M., Kowalik, K., Wóltański, D. & Pawłaszek, R.: 2010a, in Goździewski, K., Niedzielski, A., & Schneider, J. (ed.), EAS Publications Series, Vol. 42 of EAS Publications Series, pp 275–280Google Scholar
Hanasz, M., Kowalik, K., Wóltański, D., Pawłaszek, R., & Kornet, K.: 2010b, in Goździewski, K., Niedzielski, A., & Schneider, J. (ed.), EAS Publications Series, Vol. 42 of EAS Publications Series, pp 281–285Google Scholar
Hanasz, M. & Lesch, H.: 2003, A&A 412, 331Google Scholar
Hanasz, M., Otmianowska-Mazur, K., Kowal, G., & Lesch, H.: 2006, Astronomische Nachrichten 327, 469CrossRefGoogle Scholar
Hanasz, M., Otmianowska-Mazur, K., Kowal, G., & Lesch, H.: 2009b, A&A 498, 335Google Scholar
Hanasz, M., Otmianowska-Mazur, K., & Lesch, H.: 2002, A&A 386, 347Google Scholar
Hanasz, M., Wóltański, D., & Kowalik, K.: 2009c, ApJL 706, L155CrossRefGoogle Scholar
Jin, S. & Xin, Z.: 1995, Comm. Pure Appl. Math. 48, 235CrossRefGoogle Scholar
Kowal, G., Lazarian, A., Vishniac, E. T., & Otmianowska-Mazur, K.: 2009, ApJ 700, 63CrossRefGoogle Scholar
Kowal, G., Otmianowska-Mazur, K., & Hanasz, M.: 2006, A&A 445, 915Google Scholar
Krause, M.: 2009, in Revista Mexicana de Astronomia y Astrofisica Conference Series, Vol. 36 of Revista Mexicana de Astronomia y Astrofisica, vol. 27, pp 25–29Google Scholar
Otmianowska-Mazur, K., Kowal, G., & Hanasz, M.: 2007, ApJ 668, 110CrossRefGoogle Scholar
Otmianowska-Mazur, K., Soida, M., Kulesza-Żydzik, B., Hanasz, M., & Kowal, G.: 2009, ApJ 693, 1CrossRefGoogle Scholar
Parker, E. N.: 1966, ApJ 145, 811CrossRefGoogle Scholar
Parker, E. N.: 1992, ApJ 401, 137CrossRefGoogle Scholar
Pen, U.-L., Arras, P., & Wong, S.: 2003, ApJS 149, 447CrossRefGoogle Scholar
Schlickeiser, R. & Lerche, I.: 1985, A&A 151, 151Google Scholar
Siejkowski, H., Soida, M., Otmianowska-Mazur, K., Hanasz, M., & Bomans, D. J.: 2010, A&A 510, A97+Google Scholar
Wetzstein, M., Nelson, A. F., Naab, T., & Burkert, A.: 2009, ApJS 184, 298CrossRefGoogle Scholar
Wóltański, D., Hanasz, M., Kowalik, K., & Kotarba, H.: 2011, ApJ (in prep)Google Scholar