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A supernova scenario for magnetic fields and rotation measures in galaxies

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Alexander M. Beck  and
Klaus Dolag
Alexander M. Beck
Affiliation:
University Observatory MunichScheinerstr. 1, D-81679 Munich, Germany email: abeck@usm.lmu.de
Klaus Dolag
Affiliation:
University Observatory MunichScheinerstr. 1, D-81679 Munich, Germany email: abeck@usm.lmu.de
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Abstract

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We present a model for the seeding and evolution of magnetic fields in galaxies by supernovae (SN). SN explosions during galaxy assembly provide seed fields, which are subsequently amplified by compression, shear flows and random motions. Our model explains the origin of μG magnetic fields within galactic structures. We implement our model in the MHD version of the cosmological simulation code Gadget-3 and couple it with a multi-phase description of the interstellar medium. We perform simulations of Milky Way-like galactic halo formation and analyze the distribution and strength of the magnetic field. We investigate the intrinsic rotation measure (RM) evolution and find RM values exceeding 1000 rad/m2 at high redshifts and RM values around 10 rad/m2 at present-day. We compare our simulations to a limited set of observational data points and find encouraging similarities. In our model, galactic magnetic fields are a natural consequence of the very basic processes of star formation and galaxy assembly.

Keywords

methods: numericalgalaxies: formationgalaxies: magnetic fieldsearly Universe
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E6
Copyright
Copyright © International Astronomical Union 2015 

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