Measurement of Interstellar Magnetization by Synchrotron Polarization Variance

被引：0
|
作者：
Guo, Ning-Ning [1 ]
Zhang, Jian-Fu [1 ,2 ,3 ]
Xiao, Hua-Ping [1 ,2 ]
Cho, Jungyeon [3 ]
Yang, Xue-Juan [1 ,2 ]
机构：
[1] Xiangtan Univ, Dept Phys, Xiangtan 411105, Hunan, Peoples R China
[2] Xiangtan Univ, Key Lab Stars & Interstellar Medium, Xiangtan 411105, Peoples R China
[3] Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon, South Korea
来源：
ASTROPHYSICAL JOURNAL | 2024年 / 967卷 / 02期
基金：
湖南省自然科学基金; 中国国家自然科学基金;
关键词：
CHANDRASEKHAR-FERMI METHOD; FIELD STRENGTH; VELOCITY CENTROIDS; TURBULENCE; ANISOTROPY; STATISTICS; EMISSION; SPECTRUM; CLOUDS; MODES;
D O I：
10.3847/1538-4357/ad452c
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
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 Alfv & eacute;nic Mach number of magnetohydrodynamic turbulence. With the finding of the power-law relation of A proportional to M A 2 between polarization intensity variance A and Alfv & eacute;nic Mach number M A, we apply the new technique to the Canadian Galactic Plane Survey data, achieving the Alfv & eacute;nic Mach number of the Galactic ISM. Our results show that the low-latitude Galactic ISM is dominated by sub-Alf & eacute;nic turbulence, with M A approximately between 0.5 and 1.0.
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页数：10
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