Measurement of Interstellar Magnetization by Synchrotron Polarization Variance
The Astrophysical Journal(2024)
摘要
Since synchrotron polarization fluctuations are related to the fundamental
properties of the magnetic field, we propose the polarization intensity
variance to measure the Galactic interstellar medium (ISM) magnetization. We
confirm the method's applicability by comparing it with the polarization angle
dispersion and its reliability by measuring the underlying Alfvénic Mach
number of MHD turbulence. With the finding of the power-law relation of
𝒜∝ M_ A^2 between polarization intensity variance
𝒜 and Alfvénic Mach number M_ A, we apply the new
technique to the Canadian Galactic Plane Survey (CGPS) data, achieving
Alfvénic Mach number of the Galactic ISM. Our results show that the
low-latitude Galactic ISM is dominated by sub-Alfénic turbulence, with
M_ A approximately between 0.5 and 1.0.
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关键词
Interplanetary turbulence,Radiative magnetohydrodynamics,Interstellar medium,Interstellar emissions
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