Poster abstract details
Global Magnetic field structure due to the global velocity field in spiral galaxies
Abstract
Observations of magnetic fields in spiral galaxies reveal a tight connection between magnetic field structure and the spiral pattern of the galaxy.
To identify these connection in numerical simulations we have performed a set of self-consistent N-body simulations of the dynamic evolution of galactic discs including magnetic fields. Hydrodynamics and the ideal induction
equation are treated via the SPH method. We compare the results from a direct implementation of the field equations to one using Euler potentials
for the representation of the magnetic field.
Starting with a homogeneous seed field of $10^{-9}$ G we find that by differential rotation and spiral structure formation of the disc the field is
amplified to $10^{-8}$ G within two half mass rotation periods. The amplification is stronger for higher numerical resolution. The magnetic field lines are aligned with the developing spiral pattern of the gas.
To identify these connection in numerical simulations we have performed a set of self-consistent N-body simulations of the dynamic evolution of galactic discs including magnetic fields. Hydrodynamics and the ideal induction
equation are treated via the SPH method. We compare the results from a direct implementation of the field equations to one using Euler potentials
for the representation of the magnetic field.
Starting with a homogeneous seed field of $10^{-9}$ G we find that by differential rotation and spiral structure formation of the disc the field is
amplified to $10^{-8}$ G within two half mass rotation periods. The amplification is stronger for higher numerical resolution. The magnetic field lines are aligned with the developing spiral pattern of the gas.