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Galactic magnetic fields and hierarchical galaxy formation

Lookup NU author(s): Dr Luiz Santiago Rodrigues, Professor Anvar Shukurov, Dr Andrew Fletcher

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Abstract

A framework is introduced for coupling the evolution of galactic magnetic fields sustained by the mean-field dynamo with the formation and evolution of galaxies in cold dark matter cosmology. Estimates of the steady-state strength of the large-scale and turbulent magnetic fields from mean-field and fluctuation dynamo models are used together with galaxy properties predicted by semi-analytic models of galaxy formation for a population of spiral galaxies. We find that the field strength is mostly controlled by the evolving gas content of the galaxies. Thus, because of the differences in the implementation of the star formation law, feedback from supernovae and ram-pressure stripping, each of the galaxy formation models considered predicts a distribution of field strengths with unique features. The most prominent of them is the difference in typical magnetic fields strengths obtained for the satellite and central galaxy populations as well as the typical strength of the large-scale magnetic field in galaxies of different mass.


Publication metadata

Author(s): Rodrigues LFS, Shukurov A, Fletcher A, Baugh CM

Publication type: Article

Publication status: Published

Journal: Monthly Notices of the Royal Astronomical Society

Year: 2015

Volume: 450

Issue: 4

Pages: 3472-3489

Online publication date: 18/05/2015

Acceptance date: 09/04/2015

ISSN (print): 0035-8711

ISSN (electronic): 1365-2966

Publisher: Oxford University Press

URL: http://dx.doi.org/10.1093/mnras/stv816

DOI: 10.1093/mnras/stv816

Notes: http://arxiv.org/abs/1501.00690


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