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Testing the cosmological evolution of magnetic fields in galaxies with the SKA

Published online by Cambridge University Press:  01 November 2008

Tigran G. Arshakian ,
Rainer Beck ,
Marita Krause  and
Dimitry Sokoloff
Tigran G. Arshakian
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany email: [email protected]; [email protected]; [email protected]
Rainer Beck
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany email: [email protected]; [email protected]; [email protected]
Marita Krause
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany email: [email protected]; [email protected]; [email protected]
Dimitry Sokoloff
Affiliation:
Department of Physics, Moscow State University, Russia email: [email protected]
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Abstract

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We investigate the cosmological evolution of large- and small-scale magnetic fields in galaxies at high redshifts. Results from simulations of hierarchical structure formation cosmology provide a tool to develop an evolutionary model of regular magnetic fields coupled to galaxy formation and evolution. Turbulence in protogalactic halos generated by thermal virialization can drive an efficient turbulent dynamo. The mean-field dynamo theory is used to derive the timescales of amplification and ordering of regular magnetic fields in disk and dwarf galaxies. For future observations with the SKA, we predict an anticorrelation at fixed redshift between galaxy size and the ratio between ordering scale and galaxy size. Undisturbed dwarf galaxies should host fully coherent fields at z < 1, spiral galaxies at z < 0.5.

Keywords

Techniques: polarimetric – galaxies: evolution – galaxies: magnetic fields – radio continuum: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 667 - 668
Copyright
Copyright © International Astronomical Union 2009

References

Arshakian, T. G., Beck, R., Krause, M., & Sokoloff, D. 2008, A&A, in press, arXiv:0810.3114Google Scholar
Beck, R. 2005, in: Wielebinski, R. & Beck, R. (eds.), Cosmic Magnetic Fields, Lecture Notes in Physics (Berlin: Springer), vol. 664, p. 41CrossRefGoogle Scholar
Beck, R., Brandenburg, A., Moss, D., Shukurov, A., & Sokoloff, D. 1996, Ann. Rev. Astron. Astrophys. 34, 155CrossRefGoogle Scholar
Bernet, M. L., Miniati, F., Lilly, S. J., Kronberg, P. P., & Dessauges-Zavadsky, M. 2008, Nature 454, 302CrossRefGoogle Scholar
Gaensler, B. M., Beck, R., & Feretti, L. 2004, New Astr. Revs 48, 1003CrossRefGoogle Scholar
Seymour, N., Dwelly, T., Moss, D., et al. 2008, MNRAS 386, 1695CrossRefGoogle Scholar
Shukurov, A. 2005, in: Wielebinski, R. & Beck, R. (eds.), Cosmic Magnetic Fields, Lecture Notes in Physics (Berlin: Springer), vol. 664, p. 113CrossRefGoogle Scholar
van der Hulst, J. M., Sadler, E. M., Jackson, C. A., et al. 2004, New Astr. Revs 48, 1221CrossRefGoogle Scholar