Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-10-02
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
To appear in ApJ Letters
Scientific paper
We studied Faraday rotation measure (RM) in turbulent media with the rms Mach number of unity, using isothermal, magnetohydrodynamic turbulence simulations. Four cases with different values of initial plasma beta were considered. Our main findings are as follows. (1) There is no strong correlation between the fluctuations of magnetic field strength and gas density. So the magnetic field strength estimated with RM/DM (DM is the dispersion measure) correctly represents the true mean strength of the magnetic field along the line of sight. (2) The frequency distribution of RMs is well fitted to the Gaussian. In addition, there is a good relation between the width of the distribution of RM/$\bar{\rm RM}$ ($\bar{\rm RM}$ is the average value of RMs) and the strength of the regular field along the line of sight; the width is narrower, if the field strength is stronger. We discussed the implications of our findings in the warm ionized medium where the Mach number of turbulent motions is around unity.
Alexander Paul
Cho Jungyeon
Kim Jongsoo
Ryu Dongsu
Wu Qingwen
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